WesWorld

Mercury , laid down 1909, refittet 1919, scrapped 26
Venus , laid down 1909, refittet 1919, scrapped 26
Mars , laid down 1909, refittet 1919, scrapped 26
Jupiter , laid down 1909, refittet 1919, scrapped 26
Saturn , laid down 1910, refittet 1920, scrapped 26
Uranus , laid down 1910, refittet 1920, scrapped 28
Pluto , laid down 1910, refittet 1920, scrapped 28

Displacement:
662 t light; 687 t standard; 983 t normal; 1.216 t full load
Loading submergence 112 tons/feet

Dimensions:
208,33 ft x 30,84 ft x 11,15 ft (normal load)
63,50 m x 9,40 m x 3,40 m

Armament:
2 - 3,46" / 88 mm guns
5 - 2,17" / 55 mm guns
Weight of broadside 67 lbs / 30 kg

Armour:
Main gun shields 0,98" / 25 mm, 2nd gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 1 shaft, 1.341 ihp / 1.000 Kw = 14,48 kts
Range 10.000nm at 10,00 kts

Complement:
87 - 114

Cost:
£0,045 million / $0,179 million

Distribution of weights at normal displacement:
Armament: 8 tons, 0,9%
Armour: 4 tons, 0,5%
Belts: 0 tons, 0,0%, Armament: 4 tons, 0,5%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 103 tons, 10,5%
Hull, fittings & equipment: 346 tons, 35,2%
Fuel, ammunition & stores: 321 tons, 32,7%
Miscellaneous weights: 200 tons, 20,3%

Metacentric height 1,0

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 1,07
Shellfire needed to sink: 1.846 lbs / 837 Kg = 88,8 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,0
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 100 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,12
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,480
Sharpness coefficient: 0,37
Hull speed coefficient 'M': 6,40
'Natural speed' for length: 14,43 kts
Power going to wave formation at top speed: 45 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 63,7%
Relative accommodation and working space: 98,8%
(Average = 100%)
Displacement factor: 206%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1,03
(Structure weight / hull surface area: 49 lbs / square foot or 240 Kg / square metre)
Relative longitudinal hull strength: 3,47
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,96 ft)
Relative composite hull strength: 1,16

Polar Bear , laid down 1911, refittet 1921, sold to Australia 1931
Polar Light , laid down 1911, refittet 1921, sold to Australia 1931
Snow-White , laid down 1911, refittet 1922, sold to Australia 1931
Snow Flake , laid down 1912, refittet 1922, sold to Australia 1931

Original Data:

Displacement:
815 t light; 845 t standard; 1.246 t normal; 1.561 t full load
Loading submergence 132 tons/feet

Dimensions:
221,46 ft x 31,17 ft x 11,48 ft (normal load)
67,50 m x 9,50 m x 3,50 m

Armament:
2 - 3,46" / 88 mm guns
4 - 2,17" / 55 mm guns
Weight of broadside 62 lbs / 28 kg

Armour:
Belt 0,39" / 10 mm, end belts 0,98" / 25 mm
Belts cover 67% of normal area
Main gun shields 0,98" / 25 mm, 2nd gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2.011 ihp / 1.500 Kw = 15,49 kts
Range 11.800nm at 10,00 kts

Complement:
104 - 136

Cost:
£0,054 million / $0,215 million

Distribution of weights at normal displacement:
Armament: 8 tons, 0,6%
Armour: 27 tons, 2,2%
Belts: 24 tons, 1,9%, Armament: 4 tons, 0,3%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 134 tons, 10,7%
Hull, fittings & equipment: 346 tons, 27,8%
Fuel, ammunition & stores: 431 tons, 34,6%
Miscellaneous weights: 300 tons, 24,1%

Metacentric height 1,1

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 1,16
Shellfire needed to sink: 2.230 lbs / 1.011 Kg = 107,2 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,0
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 74 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,07
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,29
'Natural speed' for length: 14,88 kts
Power going to wave formation at top speed: 49 %
Trim: 37
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 66,7%
Relative accommodation and working space: 97,3%
(Average = 100%)
Displacement factor: 190%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,91
(Structure weight / hull surface area: 43 lbs / square foot or 212 Kg / square metre)
Relative longitudinal hull strength: 2,43
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,50 ft)
Relative composite hull strength: 1,01

After modernisation:

Displacement:
822 t light; 850 t standard; 1.246 t normal; 1.557 t full load
Loading submergence 132 tons/feet

Dimensions:
221,46 ft x 31,17 ft x 11,48 ft (normal load)
67,50 m x 9,50 m x 3,50 m

Armament:
2 - 3,46" / 88 mm guns
4 - 0,79" / 20 mm guns
Weight of broadside 43 lbs / 19 kg

Armour:
Belt 0,39" / 10 mm, end belts 0,98" / 25 mm
Belts cover 67% of normal area
Main gun shields 0,98" / 25 mm, Light gun shields 0,39" / 10 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2.011 ihp / 1.500 Kw = 15,49 kts
Range 11.800nm at 10,00 kts

Complement:
104 - 136

Cost:
£0,052 million / $0,208 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0,4%
Armour: 26 tons, 2,1%
Belts: 24 tons, 1,9%, Armament: 2 tons, 0,2%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 134 tons, 10,7%
Hull, fittings & equipment: 357 tons, 28,7%
Fuel, ammunition & stores: 424 tons, 34,0%
Miscellaneous weights: 300 tons, 24,1%

Metacentric height 1,1

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 1,16
Shellfire needed to sink: 2.279 lbs / 1.034 Kg = 109,6 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 1,1
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 74 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0,05
Relative quality as seaboat: 2,00

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,29
'Natural speed' for length: 14,88 kts
Power going to wave formation at top speed: 49 %
Trim: 37
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 65,2%
Relative accommodation and working space: 97,3%
(Average = 100%)
Displacement factor: 196%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,96
(Structure weight / hull surface area: 45 lbs / square foot or 219 Kg / square metre)
Relative longitudinal hull strength: 2,53
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,50 ft)
Relative composite hull strength: 1,05

Cheiron , laid down 1911, refittet 1922, scrapped 1929
Nessos , laid down 1911, refittet 1922, scrapped 1929
Pholos , laid down 1911, refittet 1922, scrapped 1929
Eurytion , laid down 1912, refittet 1922, scrapped 1929
Rhötos , laid down 1912, refittet 1923, scrapped 1929
Peträos , laid down 1912, refittet 1923, scrapped 1929
Diktys , laid down 1912, refittet 1923, scrapped 1929
Cyllaros , laid down 1913, refittet 1923, scrapped 1929
Hylonome , laid down 1913, refittet 1924, scrapped 1929
Rhoikos , laid down 1913, refittet 1924, scrapped 1929
Hylaios laid down 1913, refittet 1924, scrapped 1929



Original Data:

Displacement:
839 t light; 872 t standard; 1.246 t normal; 1.539 t full load
Loading submergence 132 tons/feet

Dimensions:
221,46 ft x 31,17 ft x 11,48 ft (normal load)
67,50 m x 9,50 m x 3,50 m

Armament:
4 - 3,46" / 88 mm guns
4 - 2,17" / 55 mm guns
Weight of broadside 103 lbs / 47 kg

Armour:
Main gun shields 0,98" / 25 mm, 2nd gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2.447 ihp / 1.825 Kw = 16,28 kts
Range 11.000nm at 10,00 kts

Complement:
104 - 136

Cost:
£0,063 million / $0,252 million

Distribution of weights at normal displacement:
Armament: 13 tons, 1,0%
Armour: 6 tons, 0,5%
Belts: 0 tons, 0,0%, Armament: 6 tons, 0,5%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 163 tons, 13,1%
Hull, fittings & equipment: 357 tons, 28,7%
Fuel, ammunition & stores: 407 tons, 32,7%
Miscellaneous weights: 300 tons, 24,1%

Metacentric height 1,1

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 1,15
Shellfire needed to sink: 1.918 lbs / 870 Kg = 92,2 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0,9
(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: 0,12
Relative quality as seaboat: 1,92

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,29
'Natural speed' for length: 14,88 kts
Power going to wave formation at top speed: 52 %
Trim: 37
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 77,2%
Relative accommodation and working space: 97,3%
(Average = 100%)
Displacement factor: 170%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,91
(Structure weight / hull surface area: 45 lbs / square foot or 219 Kg / square metre)
Relative longitudinal hull strength: 2,56
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,50 ft)
Relative composite hull strength: 1,01

After modernisation:

Displacement:
849 t light; 878 t standard; 1.246 t normal; 1.535 t full load
Loading submergence 132 tons/feet

Dimensions:
221,46 ft x 31,17 ft x 11,48 ft (normal load)
67,50 m x 9,50 m x 3,50 m

Armament:
2 - 3,46" / 88 mm guns
2 - 1,57" / 40 mm QF guns
2 - 0,79" / 20 mm guns
Weight of broadside 46 lbs / 21 kg

Armour:
Main gun shields 0,98" / 25 mm, QF gun shields 0,59" / 15 mm, Light gun shields 0,39" / 10 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 2.447 ihp / 1.825 Kw = 16,28 kts
Range 11.000nm at 10,00 kts

Complement:
104 - 136

Cost:
£0,057 million / $0,229 million

Distribution of weights at normal displacement:
Armament: 6 tons, 0,5%
Armour: 3 tons, 0,2%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,2%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 163 tons, 13,1%
Hull, fittings & equipment: 378 tons, 30,4%
Fuel, ammunition & stores: 396 tons, 31,8%
Miscellaneous weights: 300 tons, 24,1%

Metacentric height 1,1

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 1,15
Shellfire needed to sink: 2.035 lbs / 923 Kg = 97,9 x 3,5 " / 88 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0,9
(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: 0,05
Relative quality as seaboat: 1,93

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,29
'Natural speed' for length: 14,88 kts
Power going to wave formation at top speed: 52 %
Trim: 37
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 72,9%
Relative accommodation and working space: 97,3%
(Average = 100%)
Displacement factor: 185%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1,01
(Structure weight / hull surface area: 47 lbs / square foot or 232 Kg / square metre)
Relative longitudinal hull strength: 2,75
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,50 ft)
Relative composite hull strength: 1,11

Searcher , laid down 1914, sold to India 1931
Seraph , laid down 1914, sold to India 1931
Saladin , laid down 1914, sold to India 1931
Serene , laid down 1914, sold to India 1931
Sesame , laid down 1914, sold to India 1931
Shamrock , laid down 1914, sold to India 1931
Splendid , laid down 1915, sold to India 1931
Spindrift , laid down 1915, sold to India 1931
Stalwart , laid down 1915, scrapped 1931
Steadfast , laid down 1915, scrapped 1931
Storm , laid down 1915, scrapped 1931
Strenuous , laid down 1915, scrapped 1931
Sturdy , laid down 1915, scrapped 1931
Swordsman , laid down 1916, scrapped 1931
Success , laid down 1916, scrapped 1931
Scourge , laid down 1916, scrapped 1931
Swift , laid down 1916, scrapped 1930
Sentinel , laid down 1917, scrapped 1930
Swan , laid down 1917, scrapped 1930
Surprise , laid down 1917, scrapped 1930

Displacement:
948 t light; 985 t standard; 1.426 t normal; 1.774 t full load
Loading submergence 147 tons/feet

Dimensions:
229,66 ft x 33,46 ft x 11,81 ft (normal load)
70,00 m x 10,20 m x 3,60 m

Armament:
2 - 4,13" / 105 mm guns
2 - 2,17" / 55 mm guns
1 - 3,46" / 88 mm AA guns
Weight of broadside 102 lbs / 46 kg

Armour:
Main gun shields 0,98" / 25 mm, 2nd gun shields 0,98" / 25 mm

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 3.352 ihp / 2.500 Kw = 17,29 kts
Range 12.500nm at 10,00 kts

Complement:
116 - 150

Cost:
£0,095 million / $0,380 million

Distribution of weights at normal displacement:
Armament: 13 tons, 0,9%
Armour: 3 tons, 0,2%
Belts: 0 tons, 0,0%, Armament: 3 tons, 0,2%, Armour Deck: 0 tons, 0,0%
Conning Tower: 0 tons, 0,0%, Torpedo bulkhead: 0 tons, 0,0%
Machinery: 221 tons, 15,5%
Hull, fittings & equipment: 411 tons, 28,8%
Fuel, ammunition & stores: 479 tons, 33,6%
Miscellaneous weights: 300 tons, 21,0%

Metacentric height 1,3

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is adequate
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: 2.096 lbs / 951 Kg = 59,4 x 4,1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0,9
(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: 0,09
Relative quality as seaboat: 1,58

Hull form characteristics:
Block coefficient: 0,550
Sharpness coefficient: 0,39
Hull speed coefficient 'M': 6,24
'Natural speed' for length: 15,15 kts
Power going to wave formation at top speed: 54 %
Trim: 45
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 80,5%
Relative accommodation and working space: 97,1%
(Average = 100%)
Displacement factor: 169%
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0,94
(Structure weight / hull surface area: 48 lbs / square foot or 234 Kg / square metre)
Relative longitudinal hull strength: 2,48
(for 11,48 ft / 3,50 m average freeboard, freeboard adjustment 1,22 ft)
Relative composite hull strength: 1,03

Vaal , laid down 1925, rebuild 1942
Gariep , laid down 1925, rebuild 1942
Limpopo , laid down 1925, sunk 11-06-35 (bomb)
Zambezi , laid down 1925, rebuild 1942
Rovuna , laid down 1925, rebuild 1942
Save Púngoè , laid down 1925, sunk 21-07-35 (ramming)
Lurio , laid down 1925, rebuild 1942
Messalo , laid down 1925, rebuild 1942
Rio Negre , laid down 1927, rebuild 1943
Rio Santa Lucia , laid down 1927, rebuild 1943
Arroyo de la India Muerta , laid down 1927, rebuild 1943
Rio Cuareim , laid down 1927, rebuild 1943
Rio Olimer Grande , laid down 1928, sunk 20-11-35 (gunfire)
Rio Cebolatti , laid down 1928, rebuild 1943
Rio Tacuari , laid down 1928, sunk 20-11-35 (gunfire)
Rio Dayman , laid down 1928, rebuild 1943



Displacement:
597 t light; 628 t standard; 856 t normal; 1.039 t full load

Dimensions: Length overall / water x beam x draught
258,98 ft / 255,91 ft x 27,89 ft x 10,50 ft (normal load)
78,94 m / 78,00 m x 8,50 m x 3,20 m

Armament:
4 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1924 Model
Anti-aircraft guns in deck mounts
on side, all amidships
6 - 0,79" / 20,0 mm guns (3x2 guns), 0,24lbs / 0,11kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
Weight of broadside 158 lbs / 72 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,18" / 30 mm 121,88 ft / 37,15 m 7,87 ft / 2,40 m
Ends: Unarmoured
Main Belt covers 73% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,79" / 20 mm -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

- Armour deck: 0,39" / 10 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 4.021 shp / 3.000 Kw = 20,29 kts
Range 7.200nm at 15,00 kts (Bunkerage = 410 tons)

Complement:
78 - 102

Cost:
£0,183 million / $0,731 million

Distribution of weights at normal displacement:
Armament: 20 tons, 2,3%
Armour: 95 tons, 11,1%
- Belts: 50 tons, 5,8%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 13 tons, 1,6%
- Armour Deck: 32 tons, 3,7%
- Conning Tower: 0 tons, 0,0%
Machinery: 131 tons, 15,2%
Hull, fittings & equipment: 316 tons, 36,9%
Fuel, ammunition & stores: 259 tons, 30,3%
Miscellaneous weights: 35 tons, 4,1%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.667 lbs / 756 Kg = 47,2 x 4,1 " / 105 mm shells or 0,9 torpedoes
Stability (Unstable if below 1.00): 1,39
Metacentric height 1,3 ft / 0,4 m
Roll period: 10,2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,19
Seaboat quality (Average = 1.00): 1,56

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,400
Length to Beam Ratio: 9,18 : 1
'Natural speed' for length: 16,00 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11,48 ft / 3,50 m
- Forecastle (20%): 9,51 ft / 2,90 m
- Mid (50%): 9,51 ft / 2,90 m
- Quarterdeck (15%): 9,51 ft / 2,90 m
- Stern: 9,51 ft / 2,90 m
- Average freeboard: 9,67 ft / 2,95 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72,6%
- Above water (accommodation/working, high = better): 102,1%
Waterplane Area: 4.393 Square feet or 408 Square metres
Displacement factor (Displacement / loading): 156%
Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,92
- Longitudinal: 2,03
- Overall: 1,00
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

After modernization

Displacement:
586 t light; 628 t standard; 856 t normal; 1.039 t full load

Dimensions: Length overall / water x beam x draught
258,98 ft / 255,91 ft x 27,89 ft x 10,50 ft (normal load)
78,94 m / 78,00 m x 8,50 m x 3,20 m

Armament:
2 - 4,53" / 115 mm guns (1x2 guns), 50,71lbs / 23,00kg shells, 1938 Model
Dual purpose guns in deck mount
on centreline forward
8 - 1,57" / 40,0 mm guns (3 mounts), 1,95lbs / 0,88kg shells, 1935 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, 1936 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 119 lbs / 54 kg
Shells per gun, main battery: 350

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,18" / 30 mm 121,88 ft / 37,15 m 7,87 ft / 2,40 m
Ends: Unarmoured
Main Belt covers 73% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,79" / 20 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

- Armour deck: 0,39" / 10 mm, Conning tower: 1,18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 4.021 shp / 3.000 Kw = 20,29 kts
Range 7.200nm at 15,00 kts
Bunker at max displacement = 410 tons

Complement:
78 - 102

Cost:
£0,165 million / $0,659 million

Distribution of weights at normal displacement:
Armament: 14 tons, 1,6%
Armour: 92 tons, 10,7%
- Belts: 50 tons, 5,8%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 8 tons, 0,9%
- Armour Deck: 32 tons, 3,7%
- Conning Tower: 2 tons, 0,3%
Machinery: 131 tons, 15,2%
Hull, fittings & equipment: 310 tons, 36,2%
Fuel, ammunition & stores: 270 tons, 31,6%
Miscellaneous weights: 40 tons, 4,7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.709 lbs / 775 Kg = 36,8 x 4,5 " / 115 mm shells or 0,9 torpedoes
Stability (Unstable if below 1.00): 1,37
Metacentric height 1,3 ft / 0,4 m
Roll period: 10,3 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,15
Seaboat quality (Average = 1.00): 1,56

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,400
Length to Beam Ratio: 9,18 : 1
'Natural speed' for length: 16,00 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 11,48 ft / 3,50 m
- Forecastle (20%): 9,51 ft / 2,90 m
- Mid (50%): 9,51 ft / 2,90 m
- Quarterdeck (15%): 9,51 ft / 2,90 m
- Stern: 9,51 ft / 2,90 m
- Average freeboard: 9,67 ft / 2,95 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69,9%
- Above water (accommodation/working, high = better): 102,1%
Waterplane Area: 4.393 Square feet or 408 Square metres
Displacement factor (Displacement / loading): 170%
Structure weight / hull surface area: 41 lbs/sq ft or 200 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,92
- Longitudinal: 1,98
- Overall: 1,00
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

Alerter , laid down 1922, refitted 1932
Guard , laid down 1922, refitted 1932
Look-Out , laid down 1922, refitted 1932
Minder , laid down 1922, refitted 1932
Keeper , laid down 1922, refitted 1932, sunk 06-08-35 (bomb)
Watcher , laid down 1923, refitted 1932

Original Data



Displacement:
1.915 t light; 2.001 t standard; 2.277 t normal; 2.499 t full load

Dimensions: Length overall / water x beam x draught
303,84 ft / 295,28 ft x 37,40 ft x 13,12 ft (normal load)
92,61 m / 90,00 m x 11,40 m x 4,00 m

Armament:
4 - 5,00" / 127 mm guns in single mounts, 62,50lbs / 28,35kg shells, 1922 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 3,46" / 88,0 mm guns (2x2 guns), 20,79lbs / 9,43kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 335 lbs / 152 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2,76" / 70 mm 190,29 ft / 58,00 m 7,22 ft / 2,20 m
Ends: 0,59" / 15 mm 65,62 ft / 20,00 m 7,22 ft / 2,20 m
39,37 ft / 12,00 m Unarmoured ends
Upper: 1,18" / 30 mm 190,29 ft / 58,00 m 6,56 ft / 2,00 m
Main Belt covers 99% of normal length

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

- Armour deck: 1,18" / 30 mm, Conning tower: 3,15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 16.086 shp / 12.000 Kw = 24,38 kts
Range 8.000nm at 12,00 kts
Bunker at max displacement = 498 tons

Complement:
164 - 214

Cost:
£0,487 million / $1,948 million

Distribution of weights at normal displacement:
Armament: 42 tons, 1,8%
Armour: 441 tons, 19,3%
- Belts: 235 tons, 10,3%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 25 tons, 1,1%
- Armour Deck: 168 tons, 7,4%
- Conning Tower: 12 tons, 0,5%
Machinery: 546 tons, 24,0%
Hull, fittings & equipment: 787 tons, 34,6%
Fuel, ammunition & stores: 362 tons, 15,9%
Miscellaneous weights: 100 tons, 4,4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.179 lbs / 1.442 Kg = 50,9 x 5,0 " / 127 mm shells or 0,8 torpedoes
Stability (Unstable if below 1.00): 1,16
Metacentric height 1,5 ft / 0,5 m
Roll period: 12,8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,27
Seaboat quality (Average = 1.00): 1,25

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,550
Length to Beam Ratio: 7,89 : 1
'Natural speed' for length: 17,18 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,03 ft / 5,80 m
- Forecastle (20%): 17,06 ft / 5,20 m
- Mid (75%): 17,06 ft / 5,20 m (9,19 ft / 2,80 m aft of break)
- Quarterdeck (15%): 9,19 ft / 2,80 m
- Stern: 9,19 ft / 2,80 m
- Average freeboard: 15,25 ft / 4,65 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97,7%
- Above water (accommodation/working, high = better): 141,9%
Waterplane Area: 7.707 Square feet or 716 Square metres
Displacement factor (Displacement / loading): 116%
Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,88
- Longitudinal: 3,33
- Overall: 1,01
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

After modernization



Displacement:
1.912 t light; 2.001 t standard; 2.277 t normal; 2.499 t full load

Dimensions: Length overall / water x beam x draught
303,84 ft / 295,28 ft x 37,40 ft x 13,12 ft (normal load)
92,61 m / 90,00 m x 11,40 m x 4,00 m

Armament:
4 - 5,00" / 127 mm guns in single mounts, 62,50lbs / 28,35kg shells, 1922 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread, 2 raised mounts - superfiring
4 - 3,46" / 88,0 mm guns (2x2 guns), 20,79lbs / 9,43kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 1,57" / 40,0 mm guns (4x2 guns), 1,95lbs / 0,88kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all aft
10 - 0,79" / 20,0 mm guns (3 mounts), 0,24lbs / 0,11kg shells, 1922 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
Weight of broadside 351 lbs / 159 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2,76" / 70 mm 190,29 ft / 58,00 m 7,22 ft / 2,20 m
Ends: 0,59" / 15 mm 65,62 ft / 20,00 m 7,22 ft / 2,20 m
39,37 ft / 12,00 m Unarmoured ends
Upper: 1,18" / 30 mm 190,29 ft / 58,00 m 6,56 ft / 2,00 m
Main Belt covers 99% of normal length

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

- Armour deck: 1,18" / 30 mm, Conning tower: 3,15" / 80 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 16.086 shp / 12.000 Kw = 24,38 kts
Range 8.000nm at 12,00 kts
Bunker at max displacement = 498 tons

Complement:
164 - 214

Cost:
£0,491 million / $1,966 million

Distribution of weights at normal displacement:
Armament: 44 tons, 1,9%
Armour: 442 tons, 19,4%
- Belts: 235 tons, 10,3%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 27 tons, 1,2%
- Armour Deck: 168 tons, 7,4%
- Conning Tower: 12 tons, 0,5%
Machinery: 546 tons, 24,0%
Hull, fittings & equipment: 781 tons, 34,3%
Fuel, ammunition & stores: 365 tons, 16,0%
Miscellaneous weights: 100 tons, 4,4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.145 lbs / 1.427 Kg = 50,3 x 5,0 " / 127 mm shells or 0,8 torpedoes
Stability (Unstable if below 1.00): 1,16
Metacentric height 1,5 ft / 0,5 m
Roll period: 12,8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,28
Seaboat quality (Average = 1.00): 1,26

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,550
Length to Beam Ratio: 7,89 : 1
'Natural speed' for length: 17,18 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,03 ft / 5,80 m
- Forecastle (20%): 17,06 ft / 5,20 m
- Mid (75%): 17,06 ft / 5,20 m (9,19 ft / 2,80 m aft of break)
- Quarterdeck (15%): 9,19 ft / 2,80 m
- Stern: 9,19 ft / 2,80 m
- Average freeboard: 15,25 ft / 4,65 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 98,4%
- Above water (accommodation/working, high = better): 141,9%
Waterplane Area: 7.707 Square feet or 716 Square metres
Displacement factor (Displacement / loading): 115%
Structure weight / hull surface area: 56 lbs/sq ft or 272 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,87
- Longitudinal: 3,31
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Circe (revised Nanda Devi), laid down 1929
Medusa (revised Nanda Devi), laid down 1929
Euryale (revised Nanda Devi), laid down 1931
Harpy (revised Nanda Devi), laid down 1932



Displacement:
995 t light; 1.046 t standard; 1.413 t normal; 1.706 t full load

Dimensions: Length overall / water x beam x draught
303,49 ft / 290,35 ft x 32,48 ft x 11,15 ft (normal load)
92,50 m / 88,50 m x 9,90 m x 3,40 m

Armament:
2 - 5,00" / 127 mm guns in single mounts, 62,50lbs / 28,35kg shells, 1929 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,94lbs / 0,88kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns
6 - 0,79" / 20,0 mm guns (1x6 guns), 0,24lbs / 0,11kg shells, 1929 Model
Anti-aircraft guns in deck mount
on centreline forward, all raised guns
Weight of broadside 130 lbs / 59 kg
Shells per gun, main battery: 300

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: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 11.394 shp / 8.500 Kw = 24,43 kts
Range 9.000nm at 15,00 kts
Bunker at max displacement = 660 tons

Complement:
114 - 149

Cost:
£0,390 million / $1,560 million

Distribution of weights at normal displacement:
Armament: 16 tons, 1,2%
Armour: 6 tons, 0,4%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,4%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 350 tons, 24,8%
Hull, fittings & equipment: 563 tons, 39,8%
Fuel, ammunition & stores: 417 tons, 29,5%
Miscellaneous weights: 60 tons, 4,2%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2.364 lbs / 1.072 Kg = 37,8 x 5,0 " / 127 mm shells or 0,8 torpedoes
Stability (Unstable if below 1.00): 1,33
Metacentric height 1,5 ft / 0,5 m
Roll period: 11,0 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,14
Seaboat quality (Average = 1.00): 1,58

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,470
Length to Beam Ratio: 8,94 : 1
'Natural speed' for length: 17,04 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 45
Bow angle (Positive = bow angles forward): 30,00 degrees
Stern overhang: 1,77 ft / 0,54 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,69 ft / 6,00 m
- Forecastle (20%): 16,08 ft / 4,90 m
- Mid (70%): 16,08 ft / 4,90 m (8,20 ft / 2,50 m aft of break)
- Quarterdeck (15%): 8,20 ft / 2,50 m
- Stern: 8,20 ft / 2,50 m
- Average freeboard: 14,00 ft / 4,27 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 95,2%
- Above water (accommodation/working, high = better): 145,8%
Waterplane Area: 6.118 Square feet or 568 Square metres
Displacement factor (Displacement / loading): 158%
Structure weight / hull surface area: 47 lbs/sq ft or 232 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,88
- Longitudinal: 3,44
- Overall: 1,01
Hull space for machinery, storage, compartmentation is adequate
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

Polar Bear II , laid down 1932
Polar Light II , laid down 1932
Snow Flake II , laid down 1933
Snow-White II , laid down 1933

Displacement:
1.434 t light; 1.487 t standard; 1.952 t normal; 2.324 t full load

Dimensions: Length overall / water x beam x draught
303,51 ft / 291,99 ft x 36,09 ft x 12,47 ft (normal load)
92,51 m / 89,00 m x 11,00 m x 3,80 m

Armament:
2 - 5,00" / 127 mm guns in single mounts, 62,50lbs / 28,35kg shells, 1932 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
Weight of broadside 125 lbs / 57 kg
Shells per gun, main battery: 200

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0,94" / 24 mm 291,99 ft / 89,00 m 13,12 ft / 4,00 m
Ends: Unarmoured
Main Belt covers 154% of normal length

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

Machinery:
Coal and oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 6.702 ihp / 5.000 Kw = 20,23 kts
Range 12.000nm at 12,00 kts
Bunker at max displacement = 836 tons (25% coal)

Complement:
146 - 190

Cost:
£0,534 million / $2,138 million

Distribution of weights at normal displacement:
Armament: 16 tons, 0,8%
Armour: 140 tons, 7,2%
- Belts: 134 tons, 6,9%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 6 tons, 0,3%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 387 tons, 19,8%
Hull, fittings & equipment: 692 tons, 35,4%
Fuel, ammunition & stores: 518 tons, 26,5%
Miscellaneous weights: 200 tons, 10,2%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.631 lbs / 1.647 Kg = 58,1 x 5,0 " / 127 mm shells or 1,0 torpedoes
Stability (Unstable if below 1.00): 1,28
Metacentric height 1,7 ft / 0,5 m
Roll period: 11,7 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,10
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,520
Length to Beam Ratio: 8,09 : 1
'Natural speed' for length: 17,09 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 35
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 4,92 ft / 1,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,61 ft / 7,50 m
- Forecastle (20%): 17,72 ft / 5,40 m
- Mid (75%): 17,72 ft / 5,40 m (9,84 ft / 3,00 m aft of break)
- Quarterdeck (15%): 9,84 ft / 3,00 m
- Stern: 9,84 ft / 3,00 m
- Average freeboard: 16,30 ft / 4,97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82,6%
- Above water (accommodation/working, high = better): 154,0%
Waterplane Area: 7.151 Square feet or 664 Square metres
Displacement factor (Displacement / loading): 157%
Structure weight / hull surface area: 49 lbs/sq ft or 238 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,85
- Longitudinal: 4,22
- 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

Lorelei , laid down 1936

Displacement:
1.526 t light; 1.585 t standard; 1.926 t normal; 2.199 t full load

Dimensions: Length overall / water x beam x draught
322,87 ft / 313,98 ft x 34,45 ft x 12,47 ft (normal load)
98,41 m / 95,70 m x 10,50 m x 3,80 m

Armament:
3 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1935 Model
Breech loading guns in deck mounts
on centreline ends, majority aft, 1 raised mount aft
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,89kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1935 Model
Machine 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: 1,38" / 35 mm 0,98" / 25 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 21.448 shp / 16.000 Kw = 28,46 kts
Range 8.000nm at 15,00 kts
Bunker at max displacement = 614 tons

Complement:
145 - 189

Cost:
£0,768 million / $3,072 million

Distribution of weights at normal displacement:
Armament: 14 tons, 0,8%
Armour: 12 tons, 0,6%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 12 tons, 0,6%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 609 tons, 31,6%
Hull, fittings & equipment: 691 tons, 35,9%
Fuel, ammunition & stores: 400 tons, 20,8%
Miscellaneous weights: 200 tons, 10,4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.792 lbs / 813 Kg = 50,7 x 4,1 " / 105 mm shells or 0,6 torpedoes
Stability (Unstable if below 1.00): 1,12
Metacentric height 1,3 ft / 0,4 m
Roll period: 12,9 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,14
Seaboat quality (Average = 1.00): 1,29

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0,500
Length to Beam Ratio: 9,11 : 1
'Natural speed' for length: 20,37 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 18,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,31 ft / 6,80 m
- Forecastle (20%): 17,06 ft / 5,20 m
- Mid (50%): 17,06 ft / 5,20 m
- Quarterdeck (15%): 9,19 ft / 2,80 m (17,06 ft / 5,20 m before break)
- Stern: 9,19 ft / 2,80 m
- Average freeboard: 16,30 ft / 4,97 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 120,4%
- Above water (accommodation/working, high = better): 168,0%
Waterplane Area: 7.494 Square feet or 696 Square metres
Displacement factor (Displacement / loading): 125%
Structure weight / hull surface area: 45 lbs/sq ft or 222 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,74
- Longitudinal: 3,90
- Overall: 0,88
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Rukwa , laid down 1935
Njassa , laid down 1935
Chilwas , laid down 1936
Chiuta , laid down 1936
Bangweulu , laid down 1936, cancelled 1935
Embalse de Salto Grande , laid down 1936, cancelled 1935
Laguna Merin , laid down 1936, cancelled 1935



Displacement:
882 t light; 929 t standard; 1.108 t normal; 1.252 t full load

Dimensions: Length overall / water x beam x draught
229,36 ft / 223,10 ft x 31,17 ft x 11,15 ft (normal load)
69,91 m / 68,00 m x 9,50 m x 3,40 m

Armament:
4 - 4,13" / 105 mm guns (2x2 guns), 35,32lbs / 16,02kg shells, 1935 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,88kg shells, 1935 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
Weight of broadside 146 lbs / 66 kg
Shells per gun, main battery: 300

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 5.361 ihp / 4.000 Kw = 20,25 kts
Range 7.000nm at 12,00 kts
Bunker at max displacement = 323 tons

Complement:
95 - 124

Cost:
£0,449 million / $1,795 million

Distribution of weights at normal displacement:
Armament: 18 tons, 1,6%
Armour: 13 tons, 1,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 13 tons, 1,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 300 tons, 27,1%
Hull, fittings & equipment: 451 tons, 40,7%
Fuel, ammunition & stores: 226 tons, 20,4%
Miscellaneous weights: 100 tons, 9,0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.318 lbs / 598 Kg = 37,3 x 4,1 " / 105 mm shells or 0,5 torpedoes
Stability (Unstable if below 1.00): 1,25
Metacentric height 1,3 ft / 0,4 m
Roll period: 11,5 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,19
Seaboat quality (Average = 1.00): 1,72

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,500
Length to Beam Ratio: 7,16 : 1
'Natural speed' for length: 14,94 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 41
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,98 ft / 0,30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,69 ft / 6,00 m
- Forecastle (20%): 15,09 ft / 4,60 m
- Mid (75%): 15,09 ft / 4,60 m (7,22 ft / 2,20 m aft of break)
- Quarterdeck (15%): 7,22 ft / 2,20 m
- Stern: 7,22 ft / 2,20 m
- Average freeboard: 13,49 ft / 4,11 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 111,7%
- Above water (accommodation/working, high = better): 128,9%
Waterplane Area: 4.633 Square feet or 430 Square metres
Displacement factor (Displacement / loading): 129%
Structure weight / hull surface area: 50 lbs/sq ft or 245 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,96
- Longitudinal: 5,71
- Overall: 1,15
Hull space for machinery, storage, compartmentation is cramped
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

Cathedral Peak , laid down 1940
Cathkin Peak , laid down 1940
Lion´s Head , laid down 1940
Gaika´s Kop , laid down 1940
Njesuthi ,laid down 1941
Mafadi , laid down 1941
Devil`s Peak , laid down 1942
Tygerberg , laid down 1942

Displacement:
641 t light; 688 t standard; 865 t normal; 1.006 t full load

Dimensions: Length overall / water x beam x draught
228,99 ft / 223,10 ft x 29,53 ft x 11,48 ft (normal load)
69,80 m / 68,00 m x 9,00 m x 3,50 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 46,40lbs / 21,05kg shells, 1940 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
8 - 1,57" / 40,0 mm guns (2x4 guns), 1,95lbs / 0,88kg shells, 1940 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, 1940 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 202 lbs / 92 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 1,18" / 30 mm
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 9.000 shp / 6.714 Kw = 25,41 kts
Range 7.000nm at 15,00 kts
Bunker at max displacement = 318 tons

Complement:
79 - 103

Cost:
£0,464 million / $1,856 million

Distribution of weights at normal displacement:
Armament: 25 tons, 2,9%
Armour: 15 tons, 1,7%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 15 tons, 1,7%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 241 tons, 27,8%
Hull, fittings & equipment: 300 tons, 34,7%
Fuel, ammunition & stores: 224 tons, 25,9%
Miscellaneous weights: 60 tons, 6,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
599 lbs / 272 Kg = 12,9 x 4,5 " / 115 mm shells or 0,4 torpedoes
Stability (Unstable if below 1.00): 1,09
Metacentric height 1,0 ft / 0,3 m
Roll period: 12,7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,81
Seaboat quality (Average = 1.00): 1,31

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0,400
Length to Beam Ratio: 7,56 : 1
'Natural speed' for length: 17,72 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21,98 ft / 6,70 m
- Forecastle (25%): 15,09 ft / 4,60 m
- Mid (50%): 15,09 ft / 4,60 m
- Quarterdeck (22%): 7,22 ft / 2,20 m (15,09 ft / 4,60 m before break)
- Stern: 7,22 ft / 2,20 m
- Average freeboard: 14,05 ft / 4,28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 121,9%
- Above water (accommodation/working, high = better): 153,1%
Waterplane Area: 4.208 Square feet or 391 Square metres
Displacement factor (Displacement / loading): 114%
Structure weight / hull surface area: 33 lbs/sq ft or 163 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 5,32
- Overall: 0,64
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Pelican, laid down 1943
Flamingo, laid down 1943
Ibis, laid down 1943
Egret, laid down 1943

Displacement:
1.069 t light; 1.127 t standard; 1.455 t normal; 1.718 t full load

Dimensions: Length overall / water x beam x draught
301,17 ft / 290,35 ft x 33,46 ft x 11,15 ft (normal load)
91,80 m / 88,50 m x 10,20 m x 3,40 m

Armament:
4 - 4,53" / 115 mm guns (2x2 guns), 50,71lbs / 23,00kg shells, 1941 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, all raised mounts
4 - 1,57" / 40,0 mm guns (2x2 guns), 1,95lbs / 0,88kg shells, 1938 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
6 - 0,79" / 20,0 mm guns (1x6 guns), 0,24lbs / 0,11kg shells, 1938 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 213 lbs / 96 kg
Shells per gun, main battery: 240

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0,79" / 20 mm 290,35 ft / 88,50 m 3,61 ft / 1,10 m
Ends: Unarmoured
Main Belt covers 154% of normal length

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 0,98" / 25 mm 0,98" / 25 mm
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10.723 shp / 8.000 Kw = 23,94 kts
Range 9.000nm at 15,00 kts
Bunker at max displacement = 591 tons

Complement:
117 - 153

Cost:
£0,633 million / $2,531 million

Distribution of weights at normal displacement:
Armament: 24 tons, 1,7%
Armour: 45 tons, 3,1%
- Belts: 31 tons, 2,1%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 15 tons, 1,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 277 tons, 19,0%
Hull, fittings & equipment: 622 tons, 42,7%
Fuel, ammunition & stores: 387 tons, 26,6%
Miscellaneous weights: 100 tons, 6,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2.358 lbs / 1.069 Kg = 50,8 x 4,5 " / 115 mm shells or 0,9 torpedoes
Stability (Unstable if below 1.00): 1,10
Metacentric height 1,2 ft / 0,4 m
Roll period: 13,0 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,54
Seaboat quality (Average = 1.00): 1,23

Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0,470
Length to Beam Ratio: 8,68 : 1
'Natural speed' for length: 17,04 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 57
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 1,64 ft / 0,50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19,69 ft / 6,00 m
- Forecastle (20%): 14,76 ft / 4,50 m
- Mid (70%): 14,76 ft / 4,50 m (6,56 ft / 2,00 m aft of break)
- Quarterdeck (15%): 6,56 ft / 2,00 m
- Stern: 6,56 ft / 2,00 m
- Average freeboard: 12,70 ft / 3,87 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83,7%
- Above water (accommodation/working, high = better): 132,1%
Waterplane Area: 6.303 Square feet or 586 Square metres
Displacement factor (Displacement / loading): 163%
Structure weight / hull surface area: 56 lbs/sq ft or 275 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,89
- Longitudinal: 2,64
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily