WesWorld

Dear all,

I was asked if the RSAN is building any new ships in 1941. Actually, that is not the case. The SAE's yards are bussy doing refits and working on ships and classes laid down 1940 and earlier.

However, there are plans for 1942 which is an improtant year for the RSAN, so I will provide some insight into my planning.

First, there will be a new class of motor launches. Nothing special, just a sound improvement over the last class. A bit bigger and a tad bit faster, but overall pretty much the same stuff as before. They will replace the elderly boats of the R28 class.

Second, a new class of Uboat Jagers will be laid down. Only 7 tons heavier than their predecessors, and a tad bit longer, the most significant improvement will be the installation of a second main gun to improve the designs capabilities when used for patrol duties. A late lesson learnt from the ABS war. The vessels of this class will replace the remaining units of the old UJ26 class.

Third, the river boat squadrons in South America will be supported by a new class of river gun boats. The design offers a significant improvement over the former class of 1937 with a third 10,5cm twin. (OOC: However, compared to the "river battleships" Argentina is planning for, the vessels will be at disadvantage. No good news, but the RSAN will be able to react only one the Argentine vessels are clearly identified. They have to sail past the Plate after all.... Could be the start of a new arms race.)

Forth, a new class of 550ts mine sweepers fit into the RSAN budget. Like before, the RSAN designers build on their experience and improve on existing, successful designs.

Fifth, the new standard mine sweepers will be supported by a new class of 200ts coastal mine sweepers. There have been discussions if it had not been better to build more of the ocean going design, but an analysis of the ABS war experience supported the request for more hulls.

Sixth, the 1925er River class frigates will receive a life extension refit.

Seventh, the Heavy Cruisers of the 1926er Cape class will receive a life extension refit.

Eigth, to compete with international developments, a new class of fleet carriers will be laid down. The largest ever build for the RSAN, the new ships will secure the safety of the SAE's most vital life lines. The design evolved along the lines of earlier designs.

Nineth, a new class of coastal submarines in the 500ts range will continue build-up of the submarine arm of the RSAN. Many older boats have been scrapped recently as they were overaged - a result of the Cleito Treaty. The new design is designed to suit the needs of the South American theatre.

Tenth, the ocean-going cousins of the new coastal submarines will weight around 950ts and serve the same purpose - build-up of the weak submarine arm of the RSAN.

Finally, two tenders of 4400ts each will be laid down to fill the gaps that exist since some tenders were rebuilt into landing ships.

The springsharp files of all these design can be found below.

Comments are welcome.

R42 class, laid down 1942

Displacement:
118 t light; 124 t standard; 130 t normal; 136 t full load

Dimensions: Length overall / water x beam x draught
125,93 ft / 121,39 ft x 16,73 ft x 5,91 ft (normal load)
38,38 m / 37,00 m x 5,10 m x 1,80 m

Armament:
2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1942 Model
Breech loading guns in deck mounts
on side, all amidships
Weight of broadside 5 lbs / 2 kg
Shells per gun, main battery: 1.000

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

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 3.000 shp / 2.238 Kw = 24,14 kts
Range 2.000nm at 10,00 kts
Bunker at max displacement = 12 tons

Complement:
19 - 25

Cost:
£0,084 million / $0,336 million

Distribution of weights at normal displacement:
Armament: 1 tons, 0,5%
Armour: 1 tons, 0,6%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 1 tons, 0,6%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 61 tons, 47,0%
Hull, fittings & equipment: 45 tons, 34,5%
Fuel, ammunition & stores: 13 tons, 9,7%
Miscellaneous weights: 10 tons, 7,7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
51 lbs / 23 Kg = 26,0 x 1,6 " / 40 mm shells or 0,1 torpedoes
Stability (Unstable if below 1.00): 1,05
Metacentric height 0,4 ft / 0,1 m
Roll period: 11,5 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0,05
Seaboat quality (Average = 1.00): 0,72

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0,380
Length to Beam Ratio: 7,25 : 1
'Natural speed' for length: 13,17 kts
Power going to wave formation at top speed: 77 %
Trim (Max stability = 0, Max steadiness = 100): 70
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 12,47 ft / 3,80 m
- Forecastle (20%): 9,51 ft / 2,90 m
- Mid (40%): 9,51 ft / 2,90 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: 8,37 ft / 2,55 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 166,3%
- Above water (accommodation/working, high = better): 102,1%
Waterplane Area: 1.285 Square feet or 119 Square metres
Displacement factor (Displacement / loading): 76%
Structure weight / hull surface area: 16 lbs/sq ft or 78 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,50
- Longitudinal: 6,80
- Overall: 0,65
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

UJ42 class, laid down 1942

Displacement:
197 t light; 209 t standard; 237 t normal; 260 t full load

Dimensions: Length overall / water x beam x draught
146,54 ft / 140,09 ft x 22,31 ft x 6,33 ft (normal load)
44,67 m / 42,70 m x 6,80 m x 1,93 m

Armament:
2 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1942 Model
Dual purpose guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,88kg shells, 1942 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, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 46 lbs / 21 kg
Shells per gun, main battery: 280

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 0,79" / 20 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2.279 shp / 1.700 Kw = 19,72 kts
Range 3.500nm at 12,00 kts
Bunker at max displacement = 51 tons

Complement:
29 - 39

Cost:
£0,128 million / $0,511 million

Distribution of weights at normal displacement:
Armament: 6 tons, 2,4%
Armour: 5 tons, 2,1%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 5 tons, 2,1%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 60 tons, 25,1%
Hull, fittings & equipment: 112 tons, 47,0%
Fuel, ammunition & stores: 41 tons, 17,1%
Miscellaneous weights: 15 tons, 6,3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
298 lbs / 135 Kg = 14,3 x 3,5 " / 88 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,10
Metacentric height 0,6 ft / 0,2 m
Roll period: 11,8 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0,20
Seaboat quality (Average = 1.00): 1,28

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0,420
Length to Beam Ratio: 6,28 : 1
'Natural speed' for length: 11,84 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 17,72 ft / 5,40 m
- Forecastle (35%): 13,12 ft / 4,00 m (7,87 ft / 2,40 m aft of break)
- Mid (50%): 7,87 ft / 2,40 m
- Quarterdeck (15%): 7,87 ft / 2,40 m
- Stern: 7,87 ft / 2,40 m
- Average freeboard: 10,35 ft / 3,16 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 108,8%
- Above water (accommodation/working, high = better): 100,8%
Waterplane Area: 1.949 Square feet or 181 Square metres
Displacement factor (Displacement / loading): 128%
Structure weight / hull surface area: 28 lbs/sq ft or 139 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,78
- Longitudinal: 8,62
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

RGB42A, South African River Gun Boat laid down 1942

Displacement:
498 t light; 538 t standard; 603 t normal; 654 t full load

Dimensions: Length overall / water x beam x draught
229,28 ft / 223,10 ft x 26,25 ft x 6,00 ft (normal load)
69,88 m / 68,00 m x 8,00 m x 1,83 m

Armament:
6 - 4,13" / 105 mm guns (3x2 guns), 35,32lbs / 16,02kg shells, 1942 Model
Dual purpose guns in deck mounts
on centreline ends, majority forward, 1 raised mount - 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
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
Weight of broadside 221 lbs / 100 kg
Shells per gun, main battery: 220

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0,79" / 20 mm 98,43 ft / 30,00 m 6,56 ft / 2,00 m
Ends: Unarmoured
Main Belt covers 68% of normal length
Main belt does not fully cover magazines and engineering spaces

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,18" / 30 mm 0,79" / 20 mm -
2nd: 0,59" / 15 mm - -
3rd: 0,39" / 10 mm - -

Machinery:
Coal fired boilers, complex reciprocating steam engines,
Geared drive, 2 shafts, 2.666 ihp / 1.989 Kw = 18,52 kts
Range 2.600nm at 12,00 kts
Bunker at max displacement = 116 tons (100% coal)

Complement:
60 - 79

Cost:
£0,398 million / $1,591 million

Distribution of weights at normal displacement:
Armament: 28 tons, 4,6%
Armour: 39 tons, 6,5%
- Belts: 23 tons, 3,9%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 16 tons, 2,6%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 156 tons, 26,0%
Hull, fittings & equipment: 235 tons, 39,0%
Fuel, ammunition & stores: 104 tons, 17,3%
Miscellaneous weights: 40 tons, 6,6%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
521 lbs / 236 Kg = 14,7 x 4,1 " / 105 mm shells or 0,3 torpedoes
Stability (Unstable if below 1.00): 1,25
Metacentric height 1,0 ft / 0,3 m
Roll period: 10,9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0,35
Seaboat quality (Average = 1.00): 1,00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,600
Length to Beam Ratio: 8,50 : 1
'Natural speed' for length: 14,94 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 70
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: 12,47 ft / 3,80 m
- Forecastle (20%): 7,55 ft / 2,30 m
- Mid (44%): 7,55 ft / 2,30 m
- Quarterdeck (15%): 7,55 ft / 2,30 m
- Stern: 7,55 ft / 2,30 m
- Average freeboard: 7,94 ft / 2,42 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 128,1%
- Above water (accommodation/working, high = better): 102,6%
Waterplane Area: 4.283 Square feet or 398 Square metres
Displacement factor (Displacement / loading): 97%
Structure weight / hull surface area: 39 lbs/sq ft or 189 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,98
- Longitudinal: 1,27
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform

MS42, South African Minesweeper laid down 1942

Displacement:
537 t light; 557 t standard; 639 t normal; 705 t full load

Dimensions: Length overall / water x beam x draught
198,26 ft / 190,29 ft x 25,59 ft x 8,20 ft (normal load)
60,43 m / 58,00 m x 7,80 m x 2,50 m

Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1942 Model
Dual purpose gun in deck mount
on centreline forward
2 - 1,57" / 40,0 mm guns (1x2 guns), 1,95lbs / 0,88kg shells, 1942 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, 1942 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 40 lbs / 18 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 -
3rd: 0,59" / 15 mm - -
4th: 0,39" / 10 mm - -

- Armour deck: 0,39" / 10 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 2.681 shp / 2.000 Kw = 18,94 kts
Range 6.500nm at 12,00 kts
Bunker at max displacement = 148 tons

Complement:
63 - 82

Cost:
£0,208 million / $0,834 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0,8%
Armour: 30 tons, 4,7%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 4 tons, 0,6%
- Armour Deck: 26 tons, 4,1%
- Conning Tower: 0 tons, 0,0%
Machinery: 70 tons, 11,0%
Hull, fittings & equipment: 312 tons, 48,8%
Fuel, ammunition & stores: 102 tons, 16,0%
Miscellaneous weights: 120 tons, 18,8%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1.674 lbs / 759 Kg = 47,4 x 4,1 " / 105 mm shells or 0,9 torpedoes
Stability (Unstable if below 1.00): 1,08
Metacentric height 0,8 ft / 0,2 m
Roll period: 12,4 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0,12
Seaboat quality (Average = 1.00): 1,96

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0,560
Length to Beam Ratio: 7,44 : 1
'Natural speed' for length: 16,02 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 27
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: 17,39 ft / 5,30 m
- Forecastle (20%): 13,78 ft / 4,20 m
- Mid (50%): 13,78 ft / 4,20 m
- Quarterdeck (15%): 7,22 ft / 2,20 m (13,78 ft / 4,20 m before break)
- Stern: 7,22 ft / 2,20 m
- Average freeboard: 13,08 ft / 3,99 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63,6%
- Above water (accommodation/working, high = better): 148,8%
Waterplane Area: 3.572 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 194%
Structure weight / hull surface area: 42 lbs/sq ft or 205 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 9,15
- Overall: 1,23
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

CMS 42, South African Costal Minesweeper laid down 1941

Displacement:
198 t light; 210 t standard; 243 t normal; 270 t full load

Dimensions: Length overall / water x beam x draught
155,01 ft / 147,64 ft x 20,67 ft x 5,58 ft (normal load)
47,25 m / 45,00 m x 6,30 m x 1,70 m

Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1941 Model
Dual purpose gun in deck mount
on centreline forward
4 - 0,79" / 20,0 mm guns (2x2 guns), 0,24lbs / 0,11kg shells, 1941 Model
Machine guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 350

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

- Conning tower: 1,18" / 30 mm

Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 805 shp / 600 Kw = 15,31 kts
Range 4.000nm at 12,00 kts
Bunker at max displacement = 60 tons

Complement:
30 - 40

Cost:
£0,085 million / $0,339 million

Distribution of weights at normal displacement:
Armament: 5 tons, 1,9%
Armour: 5 tons, 1,9%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 4 tons, 1,4%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 1 tons, 0,4%
Machinery: 21 tons, 8,7%
Hull, fittings & equipment: 108 tons, 44,3%
Fuel, ammunition & stores: 45 tons, 18,6%
Miscellaneous weights: 60 tons, 24,7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
603 lbs / 273 Kg = 17,1 x 4,1 " / 105 mm shells or 0,6 torpedoes
Stability (Unstable if below 1.00): 1,14
Metacentric height 0,6 ft / 0,2 m
Roll period: 11,2 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0,18
Seaboat quality (Average = 1.00): 2,00

Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0,500
Length to Beam Ratio: 7,14 : 1
'Natural speed' for length: 12,15 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 26
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: 15,75 ft / 4,80 m
- Forecastle (20%): 9,84 ft / 3,00 m
- Mid (50%): 9,84 ft / 3,00 m
- Quarterdeck (15%): 4,92 ft / 1,50 m (9,84 ft / 3,00 m before break)
- Stern: 4,92 ft / 1,50 m
- Average freeboard: 9,58 ft / 2,92 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 72,2%
- Above water (accommodation/working, high = better): 127,1%
Waterplane Area: 2.033 Square feet or 189 Square metres
Displacement factor (Displacement / loading): 170%
Structure weight / hull surface area: 27 lbs/sq ft or 132 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,82
- Longitudinal: 6,15
- 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

CV42C, South African Fleet Carrier laid down 1942

Displacement:
30.830 t light; 31.877 t standard; 36.142 t normal; 39.554 t full load

Dimensions: Length overall / water x beam x draught
853,22 ft / 826,77 ft x 93,50 ft x 28,71 ft (normal load)
260,06 m / 252,00 m x 28,50 m x 8,75 m

Armament:
16 - 4,53" / 115 mm guns (8x2 guns), 46,40lbs / 21,05kg shells, 1942 Model
Dual purpose guns in deck mounts with hoists
on side, evenly spread, all raised mounts
24 - 2,95" / 75,0 mm guns (12x2 guns), 12,87lbs / 5,84kg shells, 1942 Model
Automatic rapid fire guns in deck mounts with hoists
on side, evenly spread, all raised mounts
24 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1942 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1.057 lbs / 479 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3,15" / 80 mm 501,97 ft / 153,00 m 13,12 ft / 4,00 m
Ends: Unarmoured
Main Belt covers 93% of normal length

- Torpedo Bulkhead:
1,18" / 30 mm 501,97 ft / 153,00 m 28,71 ft / 8,75 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,38" / 35 mm 1,38" / 35 mm 1,38" / 35 mm
2nd: 0,98" / 25 mm 0,79" / 20 mm 0,79" / 20 mm
3rd: 0,39" / 10 mm - -

- Armour deck: 4,72" / 120 mm, Conning tower: 1,18" / 30 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 176.943 shp / 132.000 Kw = 33,35 kts
Range 12.000nm at 18,00 kts
Bunker at max displacement = 7.677 tons

Complement:
1.309 - 1.703

Cost:
£11,732 million / $46,930 million

Distribution of weights at normal displacement:
Armament: 140 tons, 0,4%
Armour: 6.663 tons, 18,4%
- Belts: 886 tons, 2,5%
- Torpedo bulkhead: 630 tons, 1,7%
- Armament: 114 tons, 0,3%
- Armour Deck: 5.004 tons, 13,8%
- Conning Tower: 28 tons, 0,1%
Machinery: 4.622 tons, 12,8%
Hull, fittings & equipment: 10.405 tons, 28,8%
Fuel, ammunition & stores: 5.312 tons, 14,7%
Miscellaneous weights: 9.000 tons, 24,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
54.921 lbs / 24.912 Kg = 1.183,5 x 4,5 " / 115 mm shells or 7,0 torpedoes
Stability (Unstable if below 1.00): 1,12
Metacentric height 5,6 ft / 1,7 m
Roll period: 16,6 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0,07
Seaboat quality (Average = 1.00): 1,25

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0,570
Length to Beam Ratio: 8,84 : 1
'Natural speed' for length: 32,88 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 30,00 degrees
Stern overhang: 6,56 ft / 2,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 34,45 ft / 10,50 m
- Forecastle (20%): 24,44 ft / 7,45 m
- Mid (50%): 24,44 ft / 7,45 m
- Quarterdeck (15%): 24,44 ft / 7,45 m
- Stern: 24,44 ft / 7,45 m
- Average freeboard: 25,24 ft / 7,69 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92,9%
- Above water (accommodation/working, high = better): 203,6%
Waterplane Area: 57.258 Square feet or 5.319 Square metres
Displacement factor (Displacement / loading): 139%
Structure weight / hull surface area: 127 lbs/sq ft or 620 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,99
- Longitudinal: 1,02
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

~90 planes of late WW2 vintage

F-class 42, South African Coastal Submarine laid down 1942

Displacement:
479 t light; 493 t standard; 535 t normal; 568 t full load

Dimensions: Length overall / water x beam x draught
157,52 ft / 157,48 ft x 19,69 ft x 13,12 ft (normal load)
48,01 m / 48,00 m x 6,00 m x 4,00 m

Armament:
1 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1942 Model
Breech loading gun in deck mount
on centreline forward
1 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1942 Model
Machine gun in deck mount
on centreline amidships, 1 raised gun
Weight of broadside 21 lbs / 10 kg
Shells per gun, main battery: 250
4 - 21,0" / 533 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 3.000 shp / 2.238 Kw = 18,94 kts
Range 5.000nm at 10,00 kts
Bunker at max displacement = 76 tons

Complement:
55 - 72

Cost:
£0,191 million / $0,762 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0,5%
Machinery: 78 tons, 14,7%
Hull, fittings & equipment: 298 tons, 55,7%
Fuel, ammunition & stores: 56 tons, 10,4%
Miscellaneous weights: 100 tons, 18,7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
109 lbs / 50 Kg = 5,3 x 3,5 " / 88 mm shells or 0,2 torpedoes
Stability (Unstable if below 1.00): 1,02
Metacentric height 0,5 ft / 0,1 m
Roll period: 12,2 seconds
Steadiness - As gun platform (Average = 50 %): 1 %
- Recoil effect (Restricted arc if above 1.00): 0,00
Seaboat quality (Average = 1.00): 0,00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,460
Length to Beam Ratio: 8,00 : 1
'Natural speed' for length: 12,55 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 0,16 ft / 0,05 m
- Forecastle (20%): 0,16 ft / 0,05 m
- Mid (50%): 0,16 ft / 0,05 m
- Quarterdeck (15%): 0,16 ft / 0,05 m
- Stern: 0,16 ft / 0,05 m
- Average freeboard: 0,16 ft / 0,05 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 158,7%
- Above water (accommodation/working, high = better): 1,1%
Waterplane Area: 1.994 Square feet or 185 Square metres
Displacement factor (Displacement / loading): 192%
Structure weight / hull surface area: 96 lbs/sq ft or 467 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3,30
- Longitudinal: 3,37
- Overall: 3,30
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

4 bow tubes
100m operational diving depth
160m emergency diving depth
250m crush depth

S Type 42, South African Submarine laid down 1942

Displacement:
954 t light; 986 t standard; 1.186 t normal; 1.346 t full load

Dimensions: Length overall / water x beam x draught
216,99 ft / 216,54 ft x 26,25 ft x 17,39 ft (normal load)
66,14 m / 66,00 m x 8,00 m x 5,30 m

Armament:
1 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1942 Model
Breech loading gun in deck mount
on centreline forward
2 - 0,79" / 20,0 mm guns in single mounts, 0,24lbs / 0,11kg shells, 1942 Model
Machine guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 400
6 - 21,0" / 533 mm submerged torpedo tubes

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

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 4.000 shp / 2.984 Kw = 18,73 kts
Range 10.000nm at 12,00 kts
Bunker at max displacement = 360 tons

Complement:
100 - 131

Cost:
£0,330 million / $1,318 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0,4%
Armour: 0 tons, 0,0%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 104 tons, 8,8%
Hull, fittings & equipment: 645 tons, 54,4%
Fuel, ammunition & stores: 232 tons, 19,5%
Miscellaneous weights: 200 tons, 16,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
696 lbs / 316 Kg = 19,7 x 4,1 " / 105 mm shells or 0,5 torpedoes
Stability (Unstable if below 1.00): 1,11
Metacentric height 0,8 ft / 0,3 m
Roll period: 12,1 seconds
Steadiness - As gun platform (Average = 50 %): 3 %
- Recoil effect (Restricted arc if above 1.00): 0,00
Seaboat quality (Average = 1.00): 0,00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,420
Length to Beam Ratio: 8,25 : 1
'Natural speed' for length: 14,72 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0,98 ft / 0,30 m
- Forecastle (20%): 0,33 ft / 0,10 m
- Mid (50%): 0,33 ft / 0,10 m
- Quarterdeck (15%): 0,33 ft / 0,10 m
- Stern: 0,33 ft / 0,10 m
- Average freeboard: 0,38 ft / 0,12 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92,4%
- Above water (accommodation/working, high = better): 2,2%
Waterplane Area: 3.543 Square feet or 329 Square metres
Displacement factor (Displacement / loading): 267%
Structure weight / hull surface area: 116 lbs/sq ft or 565 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3,07
- Longitudinal: 3,10
- Overall: 3,07
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

6 bow tubes
100m operational diving depth
160m emergency diving depth
250m crush depth

TD42, South African Tender 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), 12,87lbs / 5,84kg 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 113 lbs / 51 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 / $4,682 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: 927 tons, 17,8%
Miscellaneous weights: 2.500 tons, 47,9%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10.291 lbs / 4.668 Kg = 799,5 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