WesWorld

Bonny Bay , laid down 1904, refitted 1930

Original data

Displacement:
2.147 t light; 2.202 t standard; 2.677 t normal; 3.047 t full load
Loading submergence 230 tons/feet

Dimensions:
255,91 ft x 44,29 ft x 13,78 ft (normal load)
78,00 m x 13,50 m x 4,20 m

Armament:
1 - 3,46" / 88 mm guns
Weight of broadside 21 lbs / 9 kg

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 1.500 ihp / 1.119 Kw = 12,67 kts
Range 8.000nm at 10,00 kts

Complement:
186 - 241

Cost:
£0,108 million / $0,433 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0,1%
Machinery: 221 tons, 8,2%
Hull, fittings & equipment: 723 tons, 27,0%
Fuel, ammunition & stores: 531 tons, 19,8%
Miscellaneous weights: 1.200 tons, 44,8%

Metacentric height 1,6

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,04
Shellfire needed to sink: 4.039 lbs / 1.832 Kg = 194,2 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,01
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,44
Hull speed coefficient 'M': 5,63
'Natural speed' for length: 16,00 kts
Power going to wave formation at top speed: 39 %
Trim: 35
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 76,8%
Relative accommodation and working space: 121,7%
(Average = 100%)
Displacement factor: 161%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,95
(Structure weight / hull surface area: 57 lbs / square foot or 279 Kg / square metre)
Relative longitudinal hull strength: 2,85
(for 14,76 ft / 4,50 m average freeboard, freeboard adjustment 3,13 ft)
Relative composite hull strength: 1,06

After modernisation

Displacement:
2.152 t light; 2.214 t standard; 2.677 t normal; 3.048 t full load

Dimensions: Length overall / water x beam x draught
262,47 ft / 255,91 ft x 44,29 ft x 13,78 ft (normal load)
80,00 m / 78,00 m x 13,50 m x 4,20 m

Armament:
2 - 4,13" / 105 mm guns (1x2 guns), 35,32lbs / 16,02kg shells, 1904 Model
Breech loading guns in deck mount
on centreline aft
2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1904 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1904 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 75 lbs / 34 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,79" / 20 mm -
2nd: 0,98" / 25 mm - -
3rd: 0,59" / 15 mm - -

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 1.500 ihp / 1.119 Kw = 12,67 kts
Range 8.000nm at 10,00 kts
Bunker at max displacement = 834 tons (100% coal)

Complement:
185 - 241

Cost:
£0,114 million / $0,456 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0,4%
Armour: 6 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 221 tons, 8,2%
Hull, fittings & equipment: 716 tons, 26,7%
Fuel, ammunition & stores: 525 tons, 19,6%
Miscellaneous weights: 1.200 tons, 44,8%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.512 lbs / 1.593 Kg = 99,4 x 4,1 " / 105 mm shells or 1,1 torpedoes
Stability (Unstable if below 1.00): 1,05
Metacentric height 1,6 ft / 0,5 m
Roll period: 14,7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 5,78 : 1
'Natural speed' for length: 16,00 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,97 ft / 7,00 m
- Forecastle (20%): 19,69 ft / 6,00 m (11,81 ft / 3,60 m aft of break)
- Mid (50%): 11,81 ft / 3,60 m
- Quarterdeck (15%): 19,69 ft / 6,00 m (11,81 ft / 3,60 m before break)
- Stern: 19,69 ft / 6,00 m
- Average freeboard: 14,83 ft / 4,52 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78,8%
- Above water (accommodation/working, high = better): 98,6%
Waterplane Area: 8.109 Square feet or 753 Square metres
Displacement factor (Displacement / loading): 155%
Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,98
- Longitudinal: 2,85
- Overall: 1,09
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Antongil Bay , laid down 1905, refitted 1931
Walvis Bay , laid down 1906, refitted 1931

Original data

Displacement:
2.862 t light; 2.936 t standard; 3.641 t normal; 4.190 t full load
Loading submergence 313 tons/feet

Dimensions:
293,64 ft x 52,49 ft x 13,78 ft (normal load)
89,50 m x 16,00 m x 4,20 m

Armament:
1 - 3,46" / 88 mm guns
Weight of broadside 21 lbs / 9 kg

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 3.000 ihp / 2.238 Kw = 14,59 kts
Range 10.000nm at 10,00 kts

Complement:
234 - 304

Cost:
£0,163 million / $0,653 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0,1%
Machinery: 435 tons, 11,9%
Hull, fittings & equipment: 1.024 tons, 28,1%
Fuel, ammunition & stores: 779 tons, 21,4%
Miscellaneous weights: 1.400 tons, 38,5%

Metacentric height 2,6

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,17
Shellfire needed to sink: 5.954 lbs / 2.701 Kg = 286,4 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,4
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,01
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,44
Hull speed coefficient 'M': 5,84
'Natural speed' for length: 17,14 kts
Power going to wave formation at top speed: 42 %
Trim: 35
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 81,7%
Relative accommodation and working space: 152,3%
(Average = 100%)
Displacement factor: 159%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,91
(Structure weight / hull surface area: 62 lbs / square foot or 302 Kg / square metre)
Relative longitudinal hull strength: 2,64
(for 17,09 ft / 5,21 m average freeboard, freeboard adjustment 4,72 ft)
Relative composite hull strength: 1,01

After modernisation

Displacement:
2.871 t light; 2.952 t standard; 3.641 t normal; 4.192 t full load

Dimensions: Length overall / water x beam x draught
300,20 ft / 293,64 ft x 52,49 ft x 13,78 ft (normal load)
91,50 m / 89,50 m x 16,00 m x 4,20 m

Armament:
2 - 4,13" / 105 mm guns (1x2 guns), 35,32lbs / 16,02kg shells, 1930 Model
Anti-aircraft guns in deck mount
on centreline forward
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,88kg shells, 1930 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1905 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 75 lbs / 34 kg
Shells per gun, main battery: 200

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,59" / 15 mm -
2nd: 0,59" / 15 mm - -

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 3.000 ihp / 2.238 Kw = 14,59 kts
Range 10.000nm at 10,00 kts
Bunker at max displacement = 1.240 tons (100% coal)

Complement:
233 - 304

Cost:
£0,169 million / $0,677 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0,3%
Armour: 4 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 4 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 435 tons, 11,9%
Hull, fittings & equipment: 1.022 tons, 28,1%
Fuel, ammunition & stores: 770 tons, 21,2%
Miscellaneous weights: 1.400 tons, 38,5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4.881 lbs / 2.214 Kg = 138,2 x 4,1 " / 105 mm shells or 1,3 torpedoes
Stability (Unstable if below 1.00): 1,20
Metacentric height 2,6 ft / 0,8 m
Roll period: 13,6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 5,59 : 1
'Natural speed' for length: 17,14 kts
Power going to wave formation at top speed: 42 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,31 ft / 6,80 m
- Forecastle (20%): 19,88 ft / 6,06 m (12,01 ft / 3,66 m aft of break)
- Mid (50%): 12,01 ft / 3,66 m
- Quarterdeck (15%): 19,88 ft / 6,06 m (12,01 ft / 3,66 m before break)
- Stern: 21,00 ft / 6,40 m
- Average freeboard: 15,04 ft / 4,58 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83,1%
- Above water (accommodation/working, high = better): 108,2%
Waterplane Area: 11.027 Square feet or 1.024 Square metres
Displacement factor (Displacement / loading): 155%
Structure weight / hull surface area: 64 lbs/sq ft or 311 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,02
- Longitudinal: 2,30
- Overall: 1,10
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

St. Francis Bay , laid down 1908, refitted 1933
St. Helena Bay , laid down 1909, refitted 1933

Displacement:
5.676 t light; 5.817 t standard; 6.785 t normal; 7.532 t full load
Loading submergence 433 tons/feet

Dimensions:
374,02 ft x 54,13 ft x 18,04 ft (normal load)
114,00 m x 16,50 m x 5,50 m

Armament:
2 - 4,13" / 105 mm guns
Weight of broadside 71 lbs / 32 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 4.021 ihp / 3.000 Kw = 14,51 kts
Range 10.000nm at 10,00 kts

Complement:
373 - 485

Cost:
£0,257 million / $1,029 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0,1%
Armour: 3 tons, 0,0%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,0%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 366 tons, 5,4%
Hull, fittings & equipment: 1.798 tons, 26,5%
Fuel, ammunition & stores: 1.109 tons, 16,4%
Miscellaneous weights: 3.500 tons, 51,6%

Metacentric height 2,0

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,01
Shellfire needed to sink: 10.598 lbs / 4.807 Kg = 300,0 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,8
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 50 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,02
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,650
Sharpness coefficient: 0,43
Hull speed coefficient 'M': 6,04
'Natural speed' for length: 19,34 kts
Power going to wave formation at top speed: 36 %
Trim: 25
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 75,2%
Relative accommodation and working space: 162,7%
(Average = 100%)
Displacement factor: 158%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,93
(Structure weight / hull surface area: 73 lbs / square foot or 354 Kg / square metre)
Relative longitudinal hull strength: 2,45
(for 21,00 ft / 6,40 m average freeboard, freeboard adjustment 6,98 ft)
Relative composite hull strength: 1,03


After refit

St. Francis Bay , laid down 1908, refitted 1933
St. Helena Bay , laid down 1909, refitted 1933

Displacement:
5.676 t light; 5.817 t standard; 6.785 t normal; 7.532 t full load
Loading submergence 433 tons/feet

Dimensions:
374,02 ft x 54,13 ft x 18,04 ft (normal load)
114,00 m x 16,50 m x 5,50 m

Armament:
2 - 4,13" / 105 mm guns
Weight of broadside 71 lbs / 32 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 4.021 ihp / 3.000 Kw = 14,51 kts
Range 10.000nm at 10,00 kts

Complement:
373 - 485

Cost:
£0,257 million / $1,029 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0,1%
Armour: 3 tons, 0,0%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,0%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 366 tons, 5,4%
Hull, fittings & equipment: 1.798 tons, 26,5%
Fuel, ammunition & stores: 1.109 tons, 16,4%
Miscellaneous weights: 3.500 tons, 51,6%

Metacentric height 2,0

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,01
Shellfire needed to sink: 10.598 lbs / 4.807 Kg = 300,0 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,8
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 50 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,02
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,650
Sharpness coefficient: 0,43
Hull speed coefficient 'M': 6,04
'Natural speed' for length: 19,34 kts
Power going to wave formation at top speed: 36 %
Trim: 25
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 75,2%
Relative accommodation and working space: 162,7%
(Average = 100%)
Displacement factor: 158%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,93
(Structure weight / hull surface area: 73 lbs / square foot or 354 Kg / square metre)
Relative longitudinal hull strength: 2,45
(for 21,00 ft / 6,40 m average freeboard, freeboard adjustment 6,98 ft)
Relative composite hull strength: 1,03

Delagoa Bay , laid down 1911, refitted 1934
Algoa Bay , laid down 1912, refitted 1935

Displacement:
8.333 t light; 8.548 t standard; 10.345 t normal; 11.742 t full load
Loading submergence 574 tons/feet

Dimensions:
392,06 ft x 72,18 ft x 21,33 ft (normal load)
119,50 m x 22,00 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns
1 - 3,46" / 88 mm guns
Weight of broadside 91 lbs / 41 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 6.702 ihp / 5.000 Kw = 15,58 kts
Range 10.000nm at 12,00 kts

Complement:
512 - 666

Cost:
£0,364 million / $1,454 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0,1%
Armour: 3 tons, 0,0%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,0%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 445 tons, 4,3%
Hull, fittings & equipment: 2.673 tons, 25,8%
Fuel, ammunition & stores: 2.012 tons, 19,5%
Miscellaneous weights: 5.200 tons, 50,3%

Metacentric height 3,3

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,04
Shellfire needed to sink: 16.275 lbs / 7.382 Kg = 460,8 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2,5
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 70 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,01
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,44
Hull speed coefficient 'M': 5,50
'Natural speed' for length: 19,80 kts
Power going to wave formation at top speed: 40 %
Trim: 35
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 70,2%
Relative accommodation and working space: 157,0%
(Average = 100%)
Displacement factor: 167%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,94
(Structure weight / hull surface area: 88 lbs / square foot or 431 Kg / square metre)
Relative longitudinal hull strength: 2,55
(for 21,00 ft / 6,40 m average freeboard, freeboard adjustment 5,75 ft)
Relative composite hull strength: 1,04


After refit

Displacement:
8.353 t light; 8.569 t standard; 10.345 t normal; 11.766 t full load

Dimensions: Length overall / water x beam x draught
400,26 ft / 392,06 ft x 72,18 ft x 21,33 ft (normal load)
122,00 m / 119,50 m x 22,00 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1930 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, all raised mounts
1 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1911 Model
Anti-aircraft gun in deck mount
on centreline aft, 1 raised gun
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,88kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 1 raised mount
4 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 100 lbs / 45 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,59" / 15 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 6.702 ihp / 5.000 Kw = 15,58 kts
Range 10.000nm at 12,00 kts
Bunker at max displacement = 3.198 tons (100% coal)

Complement:
512 - 666

Cost:
£0,365 million / $1,461 million

Distribution of weights at normal displacement:
Armament: 13 tons, 0,1%
Armour: 5 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 5 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 445 tons, 4,3%
Hull, fittings & equipment: 2.489 tons, 24,1%
Fuel, ammunition & stores: 1.993 tons, 19,3%
Miscellaneous weights: 5.400 tons, 52,2%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14.624 lbs / 6.633 Kg = 414,0 x 4,1 " / 105 mm shells or 2,4 torpedoes
Stability (Unstable if below 1.00): 1,03
Metacentric height 3,3 ft / 1,0 m
Roll period: 16,8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 5,43 : 1
'Natural speed' for length: 19,80 kts
Power going to wave formation at top speed: 40 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 8,20 ft / 2,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28,87 ft / 8,80 m
- Forecastle (15%): 25,59 ft / 7,80 m (17,72 ft / 5,40 m aft of break)
- Mid (50%): 17,72 ft / 5,40 m
- Quarterdeck (24%): 25,59 ft / 7,80 m (17,72 ft / 5,40 m before break)
- Stern: 25,59 ft / 7,80 m
- Average freeboard: 20,98 ft / 6,40 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72,3%
- Above water (accommodation/working, high = better): 136,4%
Waterplane Area: 20.697 Square feet or 1.923 Square metres
Displacement factor (Displacement / loading): 162%
Structure weight / hull surface area: 82 lbs/sq ft or 398 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,91
- Longitudinal: 2,38
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Nosy Bay , laid down 1913, refitted 1935

Displacement:
5.585 t light; 5.731 t standard; 6.916 t normal; 7.836 t full load
Loading submergence 384 tons/feet

Dimensions:
311,68 ft x 60,70 ft x 21,33 ft (normal load)
95,00 m x 18,50 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns
1 - 3,46" / 88 mm guns
Weight of broadside 91 lbs / 41 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 1 shaft, 4.022 shp / 3.000 Kw = 14,32 kts
Range 9.400nm at 12,00 kts

Complement:
379 - 492

Cost:
£0,250 million / $1,001 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0,2%
Armour: 3 tons, 0,0%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,0%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 173 tons, 2,5%
Hull, fittings & equipment: 1.597 tons, 23,1%
Fuel, ammunition & stores: 1.331 tons, 19,2%
Miscellaneous weights: 3.800 tons, 54,9%

Metacentric height 2,4

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,01
Shellfire needed to sink: 10.349 lbs / 4.694 Kg = 293,0 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 2,0
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 44 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,01
Relative quality as seaboat: 1,76

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,45
Hull speed coefficient 'M': 5,00
'Natural speed' for length: 17,65 kts
Power going to wave formation at top speed: 43 %
Trim: 22
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 69,8%
Relative accommodation and working space: 131,6%
(Average = 100%)
Displacement factor: 163%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,88
(Structure weight / hull surface area: 74 lbs / square foot or 362 Kg / square metre)
Relative longitudinal hull strength: 3,36
(for 19,49 ft / 5,94 m average freeboard, freeboard adjustment 5,42 ft)
Relative composite hull strength: 1,00

After Refit:

Displacement:
5.595 t light; 5.743 t standard; 6.916 t normal; 7.854 t full load

Dimensions: Length overall / water x beam x draught
319,20 ft / 311,68 ft x 60,70 ft x 21,33 ft (normal load)
97,29 m / 95,00 m x 18,50 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1931 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, all raised mounts
1 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1913 Model
Anti-aircraft gun in deck mount
on centreline aft, 1 raised gun
6 - 1,57" / 40,0 mm guns (3x2 guns), 1,95lbs / 0,89kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 104 lbs / 47 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,59" / 15 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Coal fired boilers, steam turbines,
Direct drive, 1 shaft, 4.022 shp / 3.001 Kw = 14,32 kts
Range 9.400nm at 12,00 kts
Bunker at max displacement = 2.111 tons (100% coal)

Complement:
378 - 492

Cost:
£0,252 million / $1,008 million

Distribution of weights at normal displacement:
Armament: 13 tons, 0,2%
Armour: 6 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 173 tons, 2,5%
Hull, fittings & equipment: 1.603 tons, 23,2%
Fuel, ammunition & stores: 1.321 tons, 19,1%
Miscellaneous weights: 3.800 tons, 54,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.565 lbs / 4.792 Kg = 299,1 x 4,1 " / 105 mm shells or 2,0 torpedoes
Stability (Unstable if below 1.00): 1,02
Metacentric height 2,5 ft / 0,7 m
Roll period: 16,3 seconds
Steadiness - As gun platform (Average = 50 %): 40 %
- Recoil effect (Restricted arc if above 1.00): 0,02
Seaboat quality (Average = 1.00): 1,60

Hull form characteristics:
Hull has raised forecastle, rise aft of midbreak, low quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 5,14 : 1
'Natural speed' for length: 17,65 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 20
Bow angle (Positive = bow angles forward): 2,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,56 ft / 8,40 m
- Forecastle (10%): 22,64 ft / 6,90 m (14,76 ft / 4,50 m aft of break)
- Mid (35%): 14,76 ft / 4,50 m (22,64 ft / 6,90 m aft of break)
- Quarterdeck (15%): 14,76 ft / 4,50 m (22,64 ft / 6,90 m before break)
- Stern: 14,76 ft / 4,50 m
- Average freeboard: 19,69 ft / 6,00 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70,0%
- Above water (accommodation/working, high = better): 136,5%
Waterplane Area: 13.534 Square feet or 1.257 Square metres
Displacement factor (Displacement / loading): 162%
Structure weight / hull surface area: 74 lbs/sq ft or 362 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,87
- Longitudinal: 3,41
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

False Bay , laid down 1916, scrapped 1943
Guanabara Bay , laid down 1917, scrapped 1943

Displacement:
5.769 t light; 5.915 t standard; 6.916 t normal; 7.689 t full load
Loading submergence 384 tons/feet

Dimensions:
311,68 ft x 60,70 ft x 21,33 ft (normal load)
95,00 m x 18,50 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns
1 - 3,46" / 88 mm guns
Weight of broadside 91 lbs / 41 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 1 shaft, 4.022 shp / 3.000 Kw = 14,32 kts
Range 12.400nm at 12,00 kts

Complement:
379 - 492

Cost:
£0,380 million / $1,522 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0,2%
Armour: 3 tons, 0,0%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,0%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 150 tons, 2,2%
Hull, fittings & equipment: 1.605 tons, 23,2%
Fuel, ammunition & stores: 1.147 tons, 16,6%
Miscellaneous weights: 4.000 tons, 57,8%

Metacentric height 2,4

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Good seaboat, rides out heavy weather easily

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,01
Shellfire needed to sink: 10.099 lbs / 4.581 Kg = 285,9 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,9
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 34 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,01
Relative quality as seaboat: 1,36

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,45
Hull speed coefficient 'M': 5,00
'Natural speed' for length: 17,65 kts
Power going to wave formation at top speed: 43 %
Trim: 17
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 71,8%
Relative accommodation and working space: 131,8%
(Average = 100%)
Displacement factor: 157%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,88
(Structure weight / hull surface area: 74 lbs / square foot or 364 Kg / square metre)
Relative longitudinal hull strength: 3,38
(for 19,52 ft / 5,95 m average freeboard, freeboard adjustment 5,45 ft)
Relative composite hull strength: 1,01

After Refit:

Displacement:
5.787 t light; 5.933 t standard; 6.916 t normal; 7.702 t full load

Dimensions: Length overall / water x beam x draught
322,21 ft / 311,68 ft x 60,70 ft x 21,33 ft (normal load)
98,21 m / 95,00 m x 18,50 m x 6,50 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1931 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, all raised mounts
6 - 0,79" / 20,0 mm guns (1x6 guns), 0,24lbs / 0,11kg shells, 1930 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,89kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 81 lbs / 37 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,59" / 15 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

- Conning tower: 1,18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 1 shaft, 4.022 shp / 3.001 Kw = 14,32 kts
Range 12.400nm at 12,00 kts
Bunker at max displacement = 1.770 tons

Complement:
378 - 492

Cost:
£0,380 million / $1,519 million

Distribution of weights at normal displacement:
Armament: 10 tons, 0,1%
Armour: 15 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 9 tons, 0,1%
Machinery: 150 tons, 2,2%
Hull, fittings & equipment: 1.612 tons, 23,3%
Fuel, ammunition & stores: 1.129 tons, 16,3%
Miscellaneous weights: 4.000 tons, 57,8%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9.129 lbs / 4.141 Kg = 258,5 x 4,1 " / 105 mm shells or 1,9 torpedoes
Stability (Unstable if below 1.00): 1,01
Metacentric height 2,4 ft / 0,7 m
Roll period: 16,4 seconds
Steadiness - As gun platform (Average = 50 %): 34 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 1,36

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 5,14 : 1
'Natural speed' for length: 17,65 kts
Power going to wave formation at top speed: 43 %
Trim (Max stability = 0, Max steadiness = 100): 17
Bow angle (Positive = bow angles forward): 5,00 degrees
Stern overhang: 8,20 ft / 2,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,57 ft / 8,10 m
- Forecastle (20%): 23,62 ft / 7,20 m (15,75 ft / 4,80 m aft of break)
- Mid (50%): 15,75 ft / 4,80 m
- Quarterdeck (25%): 23,62 ft / 7,20 m (15,75 ft / 4,80 m before break)
- Stern: 23,62 ft / 7,20 m
- Average freeboard: 19,53 ft / 5,95 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71,7%
- Above water (accommodation/working, high = better): 107,4%
Waterplane Area: 13.534 Square feet or 1.257 Square metres
Displacement factor (Displacement / loading): 157%
Structure weight / hull surface area: 75 lbs/sq ft or 365 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,93
- Longitudinal: 3,40
- Overall: 1,06
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily

Lüderitz Bay , laid down 1919, rebuild as landing ship 1939
Mossel Bay , laid down 1919, rebuild as landing ship 1940
Corisco Bay , laid down 1920, sunk 29-11-35 (bomb)

Displacement:
1.729 t light; 1.779 t standard; 2.158 t normal; 2.454 t full load
Loading submergence 205 tons/feet

Dimensions:
228,02 ft x 44,29 ft x 12,47 ft (normal load)
69,50 m x 13,50 m x 3,80 m

Armament:
1 - 4,13" / 105 mm guns
2 - 3,46" / 88 mm guns
Weight of broadside 77 lbs / 35 kg

Armour:
Main gun shields 0,98" / 25 mm

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 1 shaft, 3.351 shp / 2.500 Kw = 15,95 kts
Range 10.000nm at 12,00 kts

Complement:
158 - 205

Cost:
£0,186 million / $0,744 million

Distribution of weights at normal displacement:
Armament: 10 tons, 0,4%
Armour: 1 tons, 0,1%
Belts: 0 tons, 0,0%, Armament: 1 tons, 0,1%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 119 tons, 5,5%
Hull, fittings & equipment: 599 tons, 27,8%
Fuel, ammunition & stores: 429 tons, 19,9%
Miscellaneous weights: 1.000 tons, 46,3%

Metacentric height 1,6

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1,03
Shellfire needed to sink: 3.528 lbs / 1.600 Kg = 99,9 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 71 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,03
Relative quality as seaboat: 1,73

Hull form characteristics:
Block coefficient: 0,600
Sharpness coefficient: 0,45
Hull speed coefficient 'M': 5,39
'Natural speed' for length: 15,10 kts
Power going to wave formation at top speed: 55 %
Trim: 41
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 72,4%
Relative accommodation and working space: 121,1%
(Average = 100%)
Displacement factor: 164%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,91
(Structure weight / hull surface area: 55 lbs / square foot or 268 Kg / square metre)
Relative longitudinal hull strength: 3,16
(for 14,01 ft / 4,27 m average freeboard, freeboard adjustment 2,87 ft)
Relative composite hull strength: 1,03

Doringsbaai , laid down 1922, sunk 22-05-35 (torpedo)
Saldanha Bay , laid down 1923, refitted 1941
Table Bay , laid down 1923, refitted 1941
Walker Bay , laid down 1924, refitted 1941

Displacement:
6.644 t light; 6.815 t standard; 8.113 t normal; 9.152 t full load

Dimensions: Length overall / water x beam x draught
409,20 ft / 400,26 ft x 63,98 ft x 17,06 ft (normal load)
124,72 m / 122,00 m x 19,50 m x 5,20 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1922 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
1 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1922 Model
Breech loading gun in deck mount
on side
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,89kg shells, 1922 Model
Breech loading guns in deck mount
on side
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1922 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 96 lbs / 43 kg
Shells per gun, main battery: 150

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm - -
3rd: 0,59" / 15 mm - -
4th: 0,59" / 15 mm - -
5th: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 16.086 shp / 12.000 Kw = 20,32 kts
Range 10.000nm at 15,00 kts (Bunkerage = 2.336 tons)

Complement:
426 - 555

Cost:
£0,870 million / $3,480 million

Distribution of weights at normal displacement:
Armament: 12 tons, 0,1%
Armour: 6 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 546 tons, 6,7%
Hull, fittings & equipment: 2.080 tons, 25,6%
Fuel, ammunition & stores: 1.469 tons, 18,1%
Miscellaneous weights: 4.000 tons, 49,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.928 lbs / 4.957 Kg = 309,4 x 4,1 " / 105 mm shells or 2,0 torpedoes
Stability (Unstable if below 1.00): 1,12
Metacentric height 3,2 ft / 1,0 m
Roll period: 15,1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 1,54

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,650
Length to Beam Ratio: 6,26 : 1
'Natural speed' for length: 20,01 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 5,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,10 ft / 8,26 m
- Forecastle (20%): 21,98 ft / 6,70 m (14,01 ft / 4,27 m aft of break)
- Mid (50%): 14,01 ft / 4,27 m
- Quarterdeck (15%): 21,88 ft / 6,67 m (14,01 ft / 4,27 m before break)
- Stern: 21,88 ft / 6,67 m
- Average freeboard: 17,19 ft / 5,24 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77,2%
- Above water (accommodation/working, high = better): 122,9%
Waterplane Area: 19.617 Square feet or 1.822 Square metres
Displacement factor (Displacement / loading): 156%
Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 1,60
- Overall: 1,04
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

After refit

Displacement:
6.639 t light; 6.815 t standard; 8.113 t normal; 9.152 t full load

Dimensions: Length overall / water x beam x draught
409,20 ft / 400,26 ft x 63,98 ft x 17,06 ft (normal load)
124,72 m / 122,00 m x 19,50 m x 5,20 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1922 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
6 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1922 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 88 lbs / 40 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm -
4th: 0,59" / 15 mm - -
5th: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 16.086 shp / 12.000 Kw = 20,32 kts
Range 10.000nm at 15,00 kts
Bunker at max displacement = 2.336 tons

Complement:
426 - 555

Cost:
£0,867 million / $3,469 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0,1%
Armour: 8 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 8 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 546 tons, 6,7%
Hull, fittings & equipment: 2.074 tons, 25,6%
Fuel, ammunition & stores: 1.474 tons, 18,2%
Miscellaneous weights: 4.000 tons, 49,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.932 lbs / 4.959 Kg = 309,5 x 4,1 " / 105 mm shells or 2,0 torpedoes
Stability (Unstable if below 1.00): 1,12
Metacentric height 3,2 ft / 1,0 m
Roll period: 15,1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0,01
Seaboat quality (Average = 1.00): 1,54

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,650
Length to Beam Ratio: 6,26 : 1
'Natural speed' for length: 20,01 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 33
Bow angle (Positive = bow angles forward): 5,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,10 ft / 8,26 m
- Forecastle (20%): 21,98 ft / 6,70 m (14,01 ft / 4,27 m aft of break)
- Mid (50%): 14,01 ft / 4,27 m
- Quarterdeck (15%): 21,88 ft / 6,67 m (14,01 ft / 4,27 m before break)
- Stern: 21,88 ft / 6,67 m
- Average freeboard: 17,19 ft / 5,24 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77,1%
- Above water (accommodation/working, high = better): 122,9%
Waterplane Area: 19.617 Square feet or 1.822 Square metres
Displacement factor (Displacement / loading): 156%
Structure weight / hull surface area: 75 lbs/sq ft or 368 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 1,59
- Overall: 1,04
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Alexander Bay , laid down 1925, refitted 1942
Lambert's Bay , laid down 1926, refitted 1942

Displacement:
2.157 t light; 2.216 t standard; 2.609 t normal; 2.923 t full load

Dimensions: Length overall / water x beam x draught
229,33 ft / 228,02 ft x 50,85 ft x 13,12 ft (normal load)
69,90 m / 69,50 m x 15,50 m x 4,00 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1922 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1924 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1924 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 113 lbs / 51 kg
Shells per gun, main battery: 100

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm - -
2nd: 0,98" / 25 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 6.702 shp / 5.000 Kw = 18,22 kts
Range 10.000nm at 12,00 kts (Bunkerage = 707 tons)

Complement:
182 - 237

Cost:
£0,386 million / $1,543 million

Distribution of weights at normal displacement:
Armament: 14 tons, 0,5%
Armour: 6 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 218 tons, 8,3%
Hull, fittings & equipment: 719 tons, 27,6%
Fuel, ammunition & stores: 452 tons, 17,3%
Miscellaneous weights: 1.200 tons, 46,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.953 lbs / 1.793 Kg = 111,9 x 4,1 " / 105 mm shells or 1,2 torpedoes
Stability (Unstable if below 1.00): 1,09
Metacentric height 2,1 ft / 0,7 m
Roll period: 14,6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,30

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,600
Length to Beam Ratio: 4,48 : 1
'Natural speed' for length: 15,10 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,31 ft / 0,40 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,25 ft / 8,00 m
- Forecastle (20%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m aft of break)
- Mid (50%): 14,76 ft / 4,50 m
- Quarterdeck (15%): 14,76 ft / 4,50 m
- Stern: 14,76 ft / 4,50 m
- Average freeboard: 16,67 ft / 5,08 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 81,7%
- Above water (accommodation/working, high = better): 131,0%
Waterplane Area: 8.481 Square feet or 788 Square metres
Displacement factor (Displacement / loading): 149%
Structure weight / hull surface area: 57 lbs/sq ft or 280 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,87
- Longitudinal: 4,00
- Overall: 1,01
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

After refit

Displacement:
2.140 t light; 2.216 t standard; 2.609 t normal; 2.923 t full load

Dimensions: Length overall / water x beam x draught
229,33 ft / 228,02 ft x 50,85 ft x 13,12 ft (normal load)
69,90 m / 69,50 m x 15,50 m x 4,00 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1936 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread
4 - 2,95" / 75,0 mm guns (2x2 guns), 12,87lbs / 5,84kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0,79" / 20,0 mm guns (6 mounts), 0,24lbs / 0,11kg shells, 1938 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 124 lbs / 56 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0,98" / 25 mm 0,79" / 20 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 6.702 shp / 5.000 Kw = 18,22 kts
Range 10.000nm at 12,00 kts
Bunker at max displacement = 707 tons

Complement:
182 - 237

Cost:
£0,387 million / $1,550 million

Distribution of weights at normal displacement:
Armament: 16 tons, 0,6%
Armour: 7 tons, 0,3%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 7 tons, 0,3%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 218 tons, 8,3%
Hull, fittings & equipment: 710 tons, 27,2%
Fuel, ammunition & stores: 469 tons, 18,0%
Miscellaneous weights: 1.190 tons, 45,6%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.912 lbs / 1.774 Kg = 110,7 x 4,1 " / 105 mm shells or 1,2 torpedoes
Stability (Unstable if below 1.00): 1,09
Metacentric height 2,2 ft / 0,7 m
Roll period: 14,6 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,31

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,600
Length to Beam Ratio: 4,48 : 1
'Natural speed' for length: 15,10 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 38
Bow angle (Positive = bow angles forward): 0,00 degrees
Stern overhang: 1,31 ft / 0,40 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,25 ft / 8,00 m
- Forecastle (20%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m aft of break)
- Mid (50%): 14,76 ft / 4,50 m
- Quarterdeck (15%): 14,76 ft / 4,50 m
- Stern: 14,76 ft / 4,50 m
- Average freeboard: 16,67 ft / 5,08 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82,3%
- Above water (accommodation/working, high = better): 131,0%
Waterplane Area: 8.481 Square feet or 788 Square metres
Displacement factor (Displacement / loading): 149%
Structure weight / hull surface area: 57 lbs/sq ft or 276 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,85
- Longitudinal: 3,94
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Jeffreys Bay, laid down 1929
Stilbaai, laid down 1931

Displacement:
4.261 t light; 4.385 t standard; 5.259 t normal; 5.959 t full load

Dimensions: Length overall / water x beam x draught
393,52 ft / 383,86 ft x 59,06 ft x 14,76 ft (normal load)
119,94 m / 117,00 m x 18,00 m x 4,50 m

Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1929 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1929 Model
Breech loading guns in deck mounts
on side, evenly spread
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,89kg shells, 1929 Model
Breech loading guns in deck mount
on centreline forward
4 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1929 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 117 lbs / 53 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 0,59" / 15 mm -
3rd: 0,98" / 25 mm - -
4th: 0,59" / 15 mm - -
5th: 0,39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 10.000 shp / 7.460 Kw = 19,40 kts
Range 9.600nm at 15,00 kts
Bunker at max displacement = 1.574 tons

Complement:
308 - 401

Cost:
£0,818 million / $3,271 million

Distribution of weights at normal displacement:
Armament: 15 tons, 0,3%
Armour: 10 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 10 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 307 tons, 5,8%
Hull, fittings & equipment: 1.630 tons, 31,0%
Fuel, ammunition & stores: 998 tons, 19,0%
Miscellaneous weights: 2.300 tons, 43,7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.291 lbs / 4.668 Kg = 291,4 x 4,1 " / 105 mm shells or 2,0 torpedoes
Stability (Unstable if below 1.00): 1,13
Metacentric height 2,9 ft / 0,9 m
Roll period: 14,6 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,02
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,550
Length to Beam Ratio: 6,50 : 1
'Natural speed' for length: 19,59 kts
Power going to wave formation at top speed: 47 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 2,62 ft / 0,80 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,25 ft / 8,00 m
- Forecastle (20%): 20,67 ft / 6,30 m
- Mid (65%): 20,67 ft / 6,30 m (12,47 ft / 3,80 m aft of break)
- Quarterdeck (15%): 12,47 ft / 3,80 m
- Stern: 12,47 ft / 3,80 m
- Average freeboard: 18,24 ft / 5,56 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69,6%
- Above water (accommodation/working, high = better): 177,5%
Waterplane Area: 15.820 Square feet or 1.470 Square metres
Displacement factor (Displacement / loading): 173%
Structure weight / hull surface area: 70 lbs/sq ft or 343 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,93
- Longitudinal: 1,95
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Alexandra Paul , laid down 1932

Displacement:
8.398 t light; 8.623 t standard; 9.735 t normal; 10.624 t full load

Dimensions: Length overall / water x beam x draught
456,86 ft / 439,63 ft x 65,62 ft x 19,69 ft (normal load)
139,25 m / 134,00 m x 20,00 m x 6,00 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 46,40lbs / 21,05kg shells, 1928 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0,79" / 20,0 mm guns (6x2 guns), 0,24lbs / 0,11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 204 lbs / 93 kg
Shells per gun, main battery: 250

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm 0,79" / 20 mm 1,57" / 40 mm
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 13.405 shp / 10.000 Kw = 19,15 kts
Range 15.000nm at 12,00 kts
Bunker at max displacement = 2.001 tons

Complement:
489 - 637

Cost:
£1,685 million / $6,741 million

Distribution of weights at normal displacement:
Armament: 26 tons, 0,3%
Armour: 15 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 15 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 396 tons, 4,1%
Hull, fittings & equipment: 2.462 tons, 25,3%
Fuel, ammunition & stores: 1.336 tons, 13,7%
Miscellaneous weights: 5.500 tons, 56,5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11.578 lbs / 5.252 Kg = 249,5 x 4,5 " / 115 mm shells or 2,0 torpedoes
Stability (Unstable if below 1.00): 0,99
Metacentric height 2,6 ft / 0,8 m
Roll period: 17,1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,04
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,600
Length to Beam Ratio: 6,70 : 1
'Natural speed' for length: 20,97 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 9,84 ft / 3,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,56 ft / 8,40 m
- Forecastle (20%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m aft of break)
- Mid (50%): 14,76 ft / 4,50 m
- Quarterdeck (15%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m before break)
- Stern: 22,97 ft / 7,00 m
- Average freeboard: 18,00 ft / 5,49 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77,3%
- Above water (accommodation/working, high = better): 121,3%
Waterplane Area: 21.098 Square feet or 1.960 Square metres
Displacement factor (Displacement / loading): 150%
Structure weight / hull surface area: 80 lbs/sq ft or 391 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,97
- Longitudinal: 1,57
- Overall: 1,02
Caution: Poor stability - excessive risk of capsizing
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Montevideo Bay, laid down 1935
Corisco Bay II, laid down 1936

Displacement:
5.445 t light; 5.616 t standard; 6.611 t normal; 7.407 t full load

Dimensions: Length overall / water x beam x draught
393,52 ft / 383,86 ft x 65,62 ft x 16,40 ft (normal load)
119,94 m / 117,00 m x 20,00 m x 5,00 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 46,40lbs / 21,05kg shells, 1935 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,89kg shells, 1935 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1935 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 195 lbs / 89 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm 0,98" / 25 mm 1,57" / 40 mm
4th: 0,59" / 15 mm - -
5th: 0,39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 13.405 shp / 10.000 Kw = 20,10 kts
Range 10.000nm at 15,00 kts
Bunker at max displacement = 1.791 tons

Complement:
366 - 476

Cost:
£1,346 million / $5,384 million

Distribution of weights at normal displacement:
Armament: 24 tons, 0,4%
Armour: 17 tons, 0,3%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 17 tons, 0,3%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 381 tons, 5,8%
Hull, fittings & equipment: 1.922 tons, 29,1%
Fuel, ammunition & stores: 1.166 tons, 17,6%
Miscellaneous weights: 3.100 tons, 46,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.340 lbs / 4.690 Kg = 222,8 x 4,5 " / 115 mm shells or 2,1 torpedoes
Stability (Unstable if below 1.00): 1,10
Metacentric height 3,2 ft / 1,0 m
Roll period: 15,5 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0,04
Seaboat quality (Average = 1.00): 1,58

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,560
Length to Beam Ratio: 5,85 : 1
'Natural speed' for length: 19,59 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 41
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 2,62 ft / 0,80 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26,25 ft / 8,00 m
- Forecastle (20%): 20,67 ft / 6,30 m
- Mid (45%): 20,67 ft / 6,30 m (12,47 ft / 3,80 m aft of break)
- Quarterdeck (15%): 12,47 ft / 3,80 m
- Stern: 12,47 ft / 3,80 m
- Average freeboard: 16,60 ft / 5,06 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73,5%
- Above water (accommodation/working, high = better): 144,3%
Waterplane Area: 17.744 Square feet or 1.648 Square metres
Displacement factor (Displacement / loading): 162%
Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,96
- Longitudinal: 1,81
- Overall: 1,02
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Sharon den Adel , laid down 1936
Tarja Turuunen , laid down 1936

Displacement:
9.556 t light; 9.832 t standard; 11.692 t normal; 13.181 t full load

Dimensions: Length overall / water x beam x draught
483,11 ft / 465,88 ft x 68,90 ft x 21,98 ft (normal load)
147,25 m / 142,00 m x 21,00 m x 6,70 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 46,40lbs / 21,05kg shells, 1936 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 1 raised mount
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
12 - 0,79" / 20,0 mm guns (6x2 guns), 0,24lbs / 0,11kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 204 lbs / 93 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm 0,79" / 20 mm 1,57" / 40 mm
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 24.129 shp / 18.000 Kw = 21,83 kts
Range 14.000nm at 15,00 kts
Bunker at max displacement = 3.349 tons

Complement:
561 - 730

Cost:
£2,376 million / $9,505 million

Distribution of weights at normal displacement:
Armament: 26 tons, 0,2%
Armour: 15 tons, 0,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 15 tons, 0,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 677 tons, 5,8%
Hull, fittings & equipment: 2.838 tons, 24,3%
Fuel, ammunition & stores: 2.137 tons, 18,3%
Miscellaneous weights: 6.000 tons, 51,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14.124 lbs / 6.407 Kg = 304,4 x 4,5 " / 115 mm shells or 2,2 torpedoes
Stability (Unstable if below 1.00): 1,04
Metacentric height 3,1 ft / 0,9 m
Roll period: 16,5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,60

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,580
Length to Beam Ratio: 6,76 : 1
'Natural speed' for length: 21,58 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 31
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 9,84 ft / 3,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,56 ft / 8,40 m
- Forecastle (20%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m aft of break)
- Mid (50%): 14,76 ft / 4,50 m
- Quarterdeck (15%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m before break)
- Stern: 22,97 ft / 7,00 m
- Average freeboard: 18,00 ft / 5,49 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 77,1%
- Above water (accommodation/working, high = better): 115,5%
Waterplane Area: 23.040 Square feet or 2.141 Square metres
Displacement factor (Displacement / loading): 154%
Structure weight / hull surface area: 84 lbs/sq ft or 409 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,51
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Richards Bay , laid down 1942
Mossel Bay II , laid down 1942

Displacement:
4.294 t light; 4.419 t standard; 5.222 t normal; 5.864 t full load

Dimensions: Length overall / water x beam x draught
385,53 ft / 377,30 ft x 65,62 ft x 14,76 ft (normal load)
117,51 m / 115,00 m x 20,00 m x 4,50 m

Armament:
8 - 2,95" / 75,0 mm guns (4x2 guns), 13,23lbs / 6,00kg shells, 1942 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts - superfiring
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1942 Model
Breech loading guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 116 lbs / 52 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm - 0,98" / 25 mm
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 5.362 shp / 4.000 Kw = 16,46 kts
Range 10.000nm at 15,00 kts
Bunker at max displacement = 1.445 tons

Complement:
306 - 399

Cost:
£1,170 million / $4,681 million

Distribution of weights at normal displacement:
Armament: 17 tons, 0,3%
Armour: 14 tons, 0,3%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 14 tons, 0,3%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 140 tons, 2,7%
Hull, fittings & equipment: 1.623 tons, 31,1%
Fuel, ammunition & stores: 928 tons, 17,8%
Miscellaneous weights: 2.500 tons, 47,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.290 lbs / 4.668 Kg = 799,4 x 3,0 " / 75 mm shells or 2,4 torpedoes
Stability (Unstable if below 1.00): 1,14
Metacentric height 3,4 ft / 1,0 m
Roll period: 15,0 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,77

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,500
Length to Beam Ratio: 5,75 : 1
'Natural speed' for length: 19,42 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,61 ft / 7,50 m
- Forecastle (20%): 16,40 ft / 5,00 m
- Mid (75%): 16,40 ft / 5,00 m (8,53 ft / 2,60 m aft of break)
- Quarterdeck (15%): 8,53 ft / 2,60 m
- Stern: 8,53 ft / 2,60 m
- Average freeboard: 15,09 ft / 4,60 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64,2%
- Above water (accommodation/working, high = better): 156,0%
Waterplane Area: 16.495 Square feet or 1.532 Square metres
Displacement factor (Displacement / loading): 178%
Structure weight / hull surface area: 73 lbs/sq ft or 357 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,95
- Longitudinal: 1,64
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Sarah Bettens, laid down 1943
Eva Briegel, laid down 1943

Displacement:
11.581 t light; 11.930 t standard; 14.477 t normal; 16.515 t full load

Dimensions: Length overall / water x beam x draught
532,32 ft / 515,09 ft x 72,18 ft x 21,98 ft (normal load)
162,25 m / 157,00 m x 22,00 m x 6,70 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 50,71lbs / 23,00kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 1 raised mount aft - superfiring
4 - 2,95" / 75,0 mm guns (2x2 guns), 13,23lbs / 6,00kg shells, 1943 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all forward, all raised mounts - superfiring
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
8 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1938 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 273 lbs / 124 kg
Shells per gun, main battery: 350

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,57" / 40 mm 0,98" / 25 mm 1,57" / 40 mm
2nd: 0,98" / 25 mm - 0,98" / 25 mm
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 21.448 shp / 16.000 Kw = 20,57 kts
Range 18.000nm at 15,00 kts
Bunker at max displacement = 4.585 tons

Complement:
659 - 857

Cost:
£3,343 million / $13,371 million

Distribution of weights at normal displacement:
Armament: 33 tons, 0,2%
Armour: 22 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 22 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 554 tons, 3,8%
Hull, fittings & equipment: 3.472 tons, 24,0%
Fuel, ammunition & stores: 2.896 tons, 20,0%
Miscellaneous weights: 7.500 tons, 51,8%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18.982 lbs / 8.610 Kg = 409,1 x 4,5 " / 115 mm shells or 2,7 torpedoes
Stability (Unstable if below 1.00): 1,07
Metacentric height 3,5 ft / 1,1 m
Roll period: 16,1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,80

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0,620
Length to Beam Ratio: 7,14 : 1
'Natural speed' for length: 22,70 kts
Power going to wave formation at top speed: 44 %
Trim (Max stability = 0, Max steadiness = 100): 28
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 9,84 ft / 3,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27,56 ft / 8,40 m
- Forecastle (20%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m aft of break)
- Mid (50%): 14,76 ft / 4,50 m
- Quarterdeck (15%): 22,97 ft / 7,00 m (14,76 ft / 4,50 m before break)
- Stern: 22,97 ft / 7,00 m
- Average freeboard: 18,00 ft / 5,49 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71,4%
- Above water (accommodation/working, high = better): 118,2%
Waterplane Area: 27.703 Square feet or 2.574 Square metres
Displacement factor (Displacement / loading): 163%
Structure weight / hull surface area: 88 lbs/sq ft or 429 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,98
- Longitudinal: 1,22
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Excellent seaboat, comfortable, can fire her guns in the heaviest weather