WesWorld

Active Submarines of the of the Marinha Imperial

Brazilian Tubarão-class Submarine laid down 1931

Length, 242 ft x Beam, 21.4 ft x Depth, 12.9 ft
950 tons normal displacement (831 tons standard)

Main battery: 1 x 3.94-inch / 100mm
Secondary battery: 2 x 0.98-inch / 25mm

Weight of broadside: 32 lbs

8 TT, 21.0" (6 submerged)

Operational diving depth: 185 feet
Emergency diving depth: classified
Crush depth: classified

Maximum speed for 1435 shp = 15.00 knots
Approximate cruising radius, 6000 nm / 12 kts

Typical complement: 86-111


Estimated cost, $605,000 (£151,000)


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 4 tons = 0 pct
Machinery ........................ 44 tons = 5 pct
Hull and fittings; equipment ..... 561 tons = 59 pct
Fuel, ammunition, stores ......... 140 tons = 15 pct
Miscellaneous weights ............ 200 tons = 21 pct
-----
950 tons = 100 pct

Estimated metacentric height, 0.6 ft

Displacement summary:

Light ship: 809 tons
Standard displacement: 831 tons
Normal service: 950 tons
Full load: 1041 tons

Loading submergence 93 tons/foot

+++++++++++++++++++++++++


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.09

Shellfire needed to sink: 584 lbs = 19.1 x 3.9-inch shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 0.3
(Approximates number of 'typical'
torpedo hits needed to sink ship)

Relative steadiness as gun platform, 1 percent
(50 percent is 'average')

Relative rocking effect from firing to beam, 0.00

Relative quality as a seaboat: 0.00

+++++++++++++++++++++++++


Hull form characteristics:

Block coefficient: 0.50
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 7.51
'Natural speed' for length = 15.5 knots
Power going to wave formation
at top speed: 37 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 86 percent

Relative accommodation and working space: 1 percent


Displacement factor: 297 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 3.87
(Structure weight per square
foot of hull surface: 113 lbs)

Relative longitudinal hull strength: 1.44
(for 0.1 ft average freeboard;
freeboard adjustment -9.4 ft)

Relative composite hull strength: 1.85

Three Ships:
Piranha
Manta
Paraiba

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

B-Class Submarine
As completed.

Date: 1940
Ocean
Armament 2x 1.1" AA
ElecHP: 4725hp
DieselHP: 6750hp
CREW: 66
wt fuel&batts: 680t
Light Displacement 1,470t
Loaded Displacement 1,874t
Full Displacement 2,299t
Reserve buoyancy: 18%
Max Surf Speed: 18.4 knots
Max Sub Speed: 11.0 knots

Length: 95.0m
Beam: 8.8m
Draft: 5.5m
Crush depth: 300m
#TT 8 x 533mm (6 bow, 2 stern)
Mines: 24 tons (16 reload torpedoes simmed as mines)
Tons Oil: 380.0t
Tons Battery: 300.0t
Miscellaneous Weight: 38 tons

Surface Range: 12268nm@12 knots
Submerged Range: 62nm@6 knots

Eight Ships:
B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8

Sim by Brock

C Class (ex-Nemesis Class), Brazilian (ex-Greek) Submarine laid down 1925

Displacement:
425 t light; 435 t standard; 463 t normal; 486 t full load

Dimensions: Length overall / water x beam x draught
165.00 ft / 165.00 ft x 16.50 ft x 11.50 ft (normal load)
50.29 m / 50.29 m x 5.03 m x 3.51 m
4 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 1 shaft, 797 shp / 595 Kw = 14.00 kts
Range 3,500nm at 9.50 kts
Bunker at max displacement = 51 tons

Complement:
49 - 64

Cost:
£0.061 million / $0.242 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 26 tons, 5.6 %
Hull, fittings & equipment: 299 tons, 64.7 %
Fuel, ammunition & stores: 38 tons, 8.2 %
Miscellaneous weights: 100 tons, 21.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
185 lbs / 84 Kg = 1.7 x 6 " / 152 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.3 ft / 0.1 m
Roll period: 11.9 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: 0.518
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 12.85 kts
Power going to wave formation at top speed: 45 %
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): 112.2 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 1,778 Square feet or 165 Square metres
Displacement factor (Displacement / loading): 305 %
Structure weight / hull surface area: 105 lbs/sq ft or 511 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.48
- Longitudinal: 2.67
- Overall: 3.04
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

Eighteen Ships:
C-1
C-2
C-3
C-4
C-5
C-6
C-7
C-8
C-9
C-10
C-11
C-12
C-13
C-14
C-15
C-16
C-17
C-18