A Class, Brazil Coastal Submarine laid down 1936
Displacement:
337 t light; 345 t standard; 354 t normal; 361 t full load
Dimensions: Length overall / water x beam x draught
150.00 ft / 150.00 ft x 15.00 ft x 10.00 ft (normal load)
45.72 m / 45.72 m x 4.57 m x 3.05 m
Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1936 Model
Breech loading gun in deck mount
on centreline aft
2 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
Weight of broadside 14 lbs / 7 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm submerged torpedo tubes
3 tubes forward, 1 aft.
8 21in torpedos carried=16 tons
Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 2,998 shp / 2,237 Kw = 20.00 kts
Range 5,000nm at 5.00 kts
Bunker at max displacement = 16 tons
Complement:
39 - 52
Cost:
£0.132 million / $0.529 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.5 %
Machinery: 84 tons, 23.8 %
Hull, fittings & equipment: 192 tons, 54.2 %
Fuel, ammunition & stores: 17 tons, 4.8 %
Miscellaneous weights: 59 tons, 16.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
11 lbs / 5 Kg = 0.8 x 3.0 " / 76 mm shells or 0.0 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- 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: 0.550
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 12.25 kts
Power going to wave formation at top speed: 67 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 393.5 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 1,570 Square feet or 146 Square metres
Displacement factor (Displacement / loading): 146 %
Structure weight / hull surface area: 80 lbs/sq ft or 391 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.55
- Longitudinal: 2.01
- Overall: 2.32
Hull space for machinery, storage, compartmentation is extremely poor
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Operational diving depth: 232 ft / 69.6 meters
Emergency diving depth: 371 ft / 111.3 meters
Crush Depth 580 ft / 174 meters
Eight ships:
A-1
A-2
A-3
A-4
A-5
A-6
A-7
A-8