WesWorld

Submarines of the Japanese Navy.

Data here is the data released to the public

Submarines

Shinobi I class
I-1, I-2
Dimensions: 290.00 ft x 27.00 ft x 18.00 ft (submerged)
Standard displacement (surfaced): 1065 tons
Armament: 1 - 10.5 cm / 50 cal Model 1914 gun
2 - 25 mm / 60 cal Model 1914 light AA guns
6 - 21.0" submerged torpedo tubes (4 forward, 2 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 3,000 shp = 16.00 kts
Range 10,000nm at 8.00 kts
Complement: 9 Master Ninja, 72 other rank Ninja

Shinobi II class
I-3, I-4, I-5, I-6, I-7
Dimensions: 190.00 ft x 18.00 ft x 12.00 ft (submerged)
Standard Displacement (surfaced): 315 tons
Armament: 1 - 75 mm / 50 cal Model 1914 guns
4 - 21.0" submerged torpedo tubes (2 forward, 2 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 700 shp = 13.00 kts
Range 7,000nm at 8.00 kts
Complement: 5 Master Ninja, 28 other rank Ninja

IC-I class
I-8 thru I-72
Dimensions: 110.00 ft x 18.00 ft x 11.00 ft (submerged)
Standard displacement (surfaced): 180 tons
Armament: 1x1 - 7.5 cm / 50 cal Model 1930 gun
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
3 - 21.0" submerged torpedo tubes (3 forward)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 450 shp = 12.00 kts
Range 2800nm at 10.00 kts
Complement: 8 Officers, 30 other rank

IO-I class
I-73 thru I-78
Dimensions: 225.00 ft x 32.00 ft x 20.00 ft (submerged)
Standard displacement (surfaced): 1050 tons
Armament: 1x1 - 13 cm / 50 cal Model 1930 gun
1X2 - 25 mm / 60 cal Model 1926 light AA guns
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
7 - 21.0" submerged torpedo tubes (6 forward, 1 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 6000 shp = 18.00 kts
Range 7500nm at 12.00 kts
Complement: 18 Officers, 140 other rank

IO-II class
I-79 thru I-86
Dimensions: 250.00 ft x 38.00 ft x 22.00 ft (submerged)
Standard displacement (surfaced): 1500 tons
Armament: 1x1 - 13 cm / 50 cal Model 1930 gun
1x2 - 25mm / 60 cal Model 1930 light AA guns
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
8 - 21.0" submerged torpedo tubes (6 forward, 2 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 7500 shp = 18.00 kts
Range 9000nm at 12.00 kts
Complement: 20 Officers, 195 other rank

IO-III class
I-87 thru I-92
Dimensions: 205.00 ft x 30.00 ft x 19.00 ft (submerged)
Standard displacement (surfaced): 850 tons
Armament: 1x1 - 10.5 cm / 50 cal Model 1930 gun
2x2 - 13.2 mm / 65 cal Model 1930 machineguns
5 - 21.0" submerged torpedo tubes (4 forward, 1 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 5500 shp = 18.00 kts
Range 7000nm at 12.00 kts
Complement: 15 Officers, 120 other rank

IO-IV class
I-93 thru I-100
Dimensions: 240.00 ft x 34.00 ft x 21.00 ft (submerged)
Standard displacement (surfaced): 1250 tons
Armament: 1x1 - 13 cm / 50 cal Model 1930 gun
1x2 - 25 mm / 60 cal Model 1926 light AA guns
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
7 - 21.0" submerged torpedo tubes (6 forward, 1 aft)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 6500 shp = 18.00 kts
Range 8000nm at 12.00 kts
Complement: 16 Officers, 170 other rank

IC-II class
I-101 thru I-135
Dimensions: 135.00 ft x 22.00 ft x 13.00 ft (submerged)
Standard displacement (surfaced): 300 tons
Armament: 1x1 - 7.5 cm / 50 cal Model 1930 gun
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
4 - 21.0" submerged torpedo tubes (4 forward)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 1000 shp = 14.00 kts
Range 4000nm at 10.00 kts
Complement: 10 Officers, 50 other rank

IC-III class
I-136 thru I-160
Dimensions: 155.00 ft x 25.00 ft x 15.00 ft (submerged)
Standard displacement (surfaced): 450 tons
Armament: 1x1 - 7.5 cm / 50 cal Model 1930 gun
1x2 - 13.2 mm / 65 cal Model 1930 machineguns
4 - 21.0" submerged torpedo tubes (4 forward)
Machinery: One Kanzaki Diesel Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 2000 shp = 15.00 kts
Range 3400nm at 12.00 kts
Complement: 13 Officers, 70 other rank



Midget Submarines

IM-I class
IM-1 thru IM-135
Dimensions: 28.00 ft x 6.00 ft x 3.00 ft (submerged)
Standard displacement (surfaced): 6 tons
Armament: 2 - 21.0" torpedoes (forward)
Machinery: One Kanzaki Petrol Internal combustion engine plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 10 shp = 6.00 kts
Range 200nm at 6.00 kts
Complement: 2 crew



Submarine list

Shinobi I class
I-1, I-2

Shinobi II class
I-3 thru I-7

IC-I class
I-8 thru I-72

IO-I class
I-73 thru I-78

IO-II class
I-79 thru I-86

IO-III class
I-87 thru I-92

IO-IV class
I-93 thru I-100

IC-II class
I-101 thru I-135

IC-III class
I-136 thru I-160

IC-IV class
I-161 thru I-176

IO-V class
I-226 thru I-233

IO-VI class
I-256, I-257

IO-VII class
I-274, I-275

IO-VIII class
I-400, I-401

IM-I class
IM-1 thru IM-135

Ie Ichi, Japan Large Submarine laid down 1917

Displacement:
1,101 t light; 1,136 t standard; 1,611 t normal; 1,736 t full load
Loading submergence 121 tons/feet

Dimensions:
290.00 ft x 27.00 ft x 18.00 ft (normal load)
88.39 m x 8.23 m x 5.49 m

Armament:
1 - 4.13" / 105 mm guns
2 - 0.98" / 25 mm guns
Weight of broadside 36 lbs / 16 kg
6 - 21.0" / 533.4 mm submerged torpedo tubes + 20 tons torpedoes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 3,036 shp / 2,265 Kw = 17.00 kts
Range 11,500nm at 8.00 kts

Complement:
127 - 165

Cost:
£0.125 million / $0.500 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.3 %
Machinery: 111 tons, 6.9 %
Hull, fittings & equipment: 965 tons, 59.9 %
Fuel, ammunition & stores: 200 tons, 12.4 %
Miscellaneous weights: 330 tons, 20.5 %

Metacentric height 0.8

Remarks:
Hull space for machinery, storage & compartmentation is excellent
Room for accommodation & workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.04
Shellfire needed to sink: 1,158 lbs / 525 Kg = 32.8 x 4.1 " / 105 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.5
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 0 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 0.00

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 7.56
'Natural speed' for length: 17.03 kts
Power going to wave formation at top speed: 35 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 70.9 %
Relative accommodation and working space: 0.0 %
(Average = 100%)
Displacement factor: 274 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 3.48
(Structure weight / hull surface area: 133 lbs / square foot or 650 Kg / square metre)
Relative longitudinal hull strength: 1.95
(for 0.00 ft / 0.00 m average freeboard, freeboard adjustment -10.51 ft)
Relative composite hull strength: 2.26

309 tons - ballast
21 tons - 12 Type 89 torpedoes
330 tons

Diving depth: 226 feet
Emergency Depth: 339 feet
Crush Depth: 565 feet

Ie Ni, Japan Small Submarine laid down 1918

Displacement:
318 t light; 328 t standard; 469 t normal; 508 t full load
Loading submergence 53 tons/feet

Dimensions:
190.00 ft x 18.00 ft x 12.00 ft (normal load)
57.91 m x 5.49 m x 3.66 m

Armament:
1 - 2.95" / 75 mm guns
Weight of broadside 13 lbs / 6 kg
4 - 21.0" / 533.4 mm submerged torpedo tubes (2 forward, 2 aft) + 10 tons torpedoes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 769 shp / 574 Kw = 14.00 kts
Range 8,000nm at 8.00 kts

Complement:
25 - 33

Cost:
39,000 Ryo / 17.940 million yen

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3 %
Machinery: 28 tons, 5.9 %
Hull, fittings & equipment: 279 tons, 59.4 %
Fuel, ammunition & stores: 61 tons, 13.0 %
Miscellaneous weights: 100 tons, 21.3 %

Metacentric height 0.4

Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is extremely poor

Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.03
Shellfire needed to sink: 261 lbs / 118 Kg = 20.3 x 3.0 " / 75 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.2
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 0 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.00
Relative quality as seaboat: 0.00

Hull form characteristics:
Block coefficient: 0.400
Sharpness coefficient: 0.29
Hull speed coefficient 'M': 7.47
'Natural speed' for length: 13.78 kts
Power going to wave formation at top speed: 35 %
Trim: 50
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)

Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 90.9 %
Relative accommodation and working space: 0.0 %
(Average = 100%)
Displacement factor: 279 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 3.44
(Structure weight / hull surface area: 88 lbs / square foot or 429 Kg / square metre)
Relative longitudinal hull strength: 2.00
(for 0.00 ft / 0.00 m average freeboard, freeboard adjustment -8.21 ft)
Relative composite hull strength: 2.29

86 tons - ballast
14 tons - 8 Type 89 torpedoes
100 tons

Diving depth: 229 feet
Emergency Depth: 344 feet
Crush Depth: 573 feet

IC-I, Japan Coastal Submarine laid down 1930

Displacement:
163 t light; 169 t standard; 185 t normal; 197 t full load

Dimensions: Length overall / water x beam x draught
95.00 ft / 95.00 ft x 17.00 ft x 10.00 ft (normal load)
28.96 m / 28.96 m x 5.18 m x 3.05 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 12 lbs / 6 kg
Shells per gun, main battery: 250
3 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 422 shp / 314 Kw = 13.00 kts
Range 2,900nm at 10.00 kts
Bunker at max displacement = 28 tons

Complement:
24 - 32

Cost:
£0.037 million / $0.148 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.9%
Machinery: 13 tons, 6.9%
Hull, fittings & equipment: 104 tons, 56.4%
Fuel, ammunition & stores: 21 tons, 11.4%
Miscellaneous weights: 45 tons, 24.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14 lbs / 6 Kg = 1.1 x 3.0 " / 75 mm shells or 0.1 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.4 ft / 0.1 m
Roll period: 11.7 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: 0.400
Length to Beam Ratio: 5.59 : 1
'Natural speed' for length: 9.75 kts
Power going to wave formation at top speed: 59 %
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): 260.0%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 940 Square feet or 87 Square metres
Displacement factor (Displacement / loading): 221%
Structure weight / hull surface area: 73 lbs/sq ft or 356 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.17
- Longitudinal: 5.21
- Overall: 3.33
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
Caution: Lacks seaworthiness - very limited seakeeping ability

31 tons - ballast
14 tons - 8 Type 89 torpedoes
45 tons

Diving depth: 333 feet
Emergency Depth: 500 feet
Crush Depth: 833 feet

(Saw the Biber again today at Overloon. ^_^)

IM-I, Japan Midget Submarine laid down 1930

Displacement:
4 t light; 6 t standard; 8 t normal; 8 t full load

Dimensions: Length overall / water x beam x draught
28.00 ft / 28.00 ft x 6.00 ft x 4.00 ft (normal load)
8.53 m / 8.53 m x 1.83 m x 1.22 m
2 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured

- Torpedo Bulkhead: (see note below)
6.00" / 152 mm 4.00 ft / 1.22 m 3.00 ft / 0.91 m

Machinery:
Petrol Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 9 shp / 7 Kw = 7.00 kts
Range 200nm at 6.00 kts
Bunker at max displacement = 0 tons

Complement:
2 - 3

Cost:
£0.001 million / $0.005 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 3 tons, 32.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 3 tons, 32.3 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 0 tons, 3.2 %
Hull, fittings & equipment: 3 tons, 40.8 %
Fuel, ammunition & stores: 0 tons, 3.1 %
Miscellaneous weights: 2 tons, 20.6 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
-50 lbs / -23 Kg = -0.5 x 6 " / 152 mm shells or NaN torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 0.1 ft / 0.0 m
Roll period: 8.7 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: 0.430
Length to Beam Ratio: 4.67 : 1
'Natural speed' for length: 5.29 kts
Power going to wave formation at top speed: 60 %
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): 3.7 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 100 Square feet or 9 Square metres
Displacement factor (Displacement / loading): 169 %
Structure weight / hull surface area: 21 lbs/sq ft or 101 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.52
- Longitudinal: 7.07
- Overall: 2.79
Hull space for machinery, storage, compartmentation is excellent
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

Additional Data:
Ballast: 1.7 tons
Torpedoes: 3 tons (Torpedo Bulkhead used to sim the two torpedoes (= 2 * 1.5 = 3 tons))
Diving Depth: 279 feet
Emergency Depth: 418.5 feet
Crush Depth: 697.5 feet

IO-I class, Japan Patrol Submarine laid down 1931

Displacement:
1,021 t light; 1,053 t standard; 1,233 t normal; 1,378 t full load

Dimensions: Length overall / water x beam x draught
200.00 ft / 200.00 ft x 28.40 ft x 19.00 ft (normal load)
60.96 m / 60.96 m x 8.66 m x 5.79 m

Armament:
1 - 5.12" / 130 mm guns in single mounts, 65.00lbs / 29.48kg shells, 1930 Model
Breech loading gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1926 Model
Anti-aircraft guns in deck mount
on centreline amidships
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 66 lbs / 30 kg
Shells per gun, main battery: 200
7 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 5,602 shp / 4,179 Kw = 20.00 kts
Range 7,800nm at 12.00 kts
Bunker at max displacement = 325 tons

Complement:
103 - 135

Cost:
£0.289 million / $1.158 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.7%
Machinery: 168 tons, 13.6%
Hull, fittings & equipment: 595 tons, 48.2%
Fuel, ammunition & stores: 212 tons, 17.2%
Miscellaneous weights: 250 tons, 20.3%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
274 lbs / 124 Kg = 4.1 x 5.1 " / 130 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.8 ft / 0.2 m
Roll period: 13.7 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: 0.400
Length to Beam Ratio: 7.04 : 1
'Natural speed' for length: 14.14 kts
Power going to wave formation at top speed: 59 %
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): 150.1%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 3,306 Square feet or 307 Square metres
Displacement factor (Displacement / loading): 189%
Structure weight / hull surface area: 111 lbs/sq ft or 540 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.67
- Longitudinal: 3.67
- Overall: 2.75
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

215 tons - ballast
35 tons - 20 Type 89 torpedoes
250 tons

Diving depth: 275 feet
Emergency Depth: 413 feet
Crush Depth: 688 feet

IO-II class, Japan Patrol Submarine laid down 1931

Displacement:
1,460 t light; 1,503 t standard; 1,784 t normal; 2,009 t full load

Dimensions: Length overall / water x beam x draught
224.00 ft / 224.00 ft x 34.00 ft x 20.50 ft (normal load)
68.28 m / 68.28 m x 10.36 m x 6.25 m

Armament:
1 - 5.12" / 130 mm guns in single mounts, 65.00lbs / 29.48kg shells, 1930 Model
Breech loading gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1926 Model
Anti-aircraft guns in deck mount
on centreline amidships
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 66 lbs / 30 kg
Shells per gun, main battery: 200
8 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 6,714 shp / 5,008 Kw = 20.00 kts
Range 10,000nm at 12.00 kts
Bunker at max displacement = 506 tons

Complement:
136 - 178

Cost:
£0.377 million / $1.507 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.5%
Machinery: 201 tons, 11.3%
Hull, fittings & equipment: 831 tons, 46.6%
Fuel, ammunition & stores: 324 tons, 18.2%
Miscellaneous weights: 420 tons, 23.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
627 lbs / 284 Kg = 9.4 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 1.0 ft / 0.3 m
Roll period: 14.3 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: 0.400
Length to Beam Ratio: 6.59 : 1
'Natural speed' for length: 14.97 kts
Power going to wave formation at top speed: 58 %
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): 119.5%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 4,433 Square feet or 412 Square metres
Displacement factor (Displacement / loading): 201%
Structure weight / hull surface area: 122 lbs/sq ft or 594 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.62
- Longitudinal: 3.30
- Overall: 2.68
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

367 tons - ballast
53 tons - 30 Type 89 torpedoes
420 tons

Diving depth: 268 feet
Emergency Depth: 402 feet
Crush Depth: 670 feet

IO-III class, Japan Patrol Submarine laid down 1932

Displacement:
824 t light; 848 t standard; 999 t normal; 1,120 t full load

Dimensions: Length overall / water x beam x draught
190.00 ft / 190.00 ft x 27.00 ft x 17.00 ft (normal load)
57.91 m / 57.91 m x 8.23 m x 5.18 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 34.00lbs / 15.42kg shells, 1930 Model
Breech loading gun in deck mount
on centreline forward
4 - 0.52" / 13.2 mm guns (2x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mounts
on centreline, all amidships
Weight of broadside 34 lbs / 16 kg
Shells per gun, main battery: 200
5 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 5,015 shp / 3,741 Kw = 20.00 kts
Range 7,500nm at 12.00 kts
Bunker at max displacement = 272 tons

Complement:
88 - 115

Cost:
£0.242 million / $0.969 million

Distribution of weights at normal displacement:
Armament: 4 tons, 0.4%
Machinery: 148 tons, 14.8%
Hull, fittings & equipment: 472 tons, 47.2%
Fuel, ammunition & stores: 175 tons, 17.5%
Miscellaneous weights: 200 tons, 20.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
322 lbs / 146 Kg = 9.1 x 4.1 " / 105 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.7 ft / 0.2 m
Roll period: 13.2 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: 0.401
Length to Beam Ratio: 7.04 : 1
'Natural speed' for length: 13.78 kts
Power going to wave formation at top speed: 61 %
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): 125.5%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 2,988 Square feet or 278 Square metres
Displacement factor (Displacement / loading): 188%
Structure weight / hull surface area: 100 lbs/sq ft or 490 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.63
- Longitudinal: 3.20
- Overall: 2.68
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

172 tons - ballast
28 tons - 16 Type 89 torpedoes
200 tons

Diving depth: 268 feet
Emergency Depth: 402 feet
Crush Depth: 670 feet

IO-IV Class, Japan Patrol Submarine laid down 1932

Displacement:
1,214 t light; 1,251 t standard; 1,467 t normal; 1,641 t full load

Dimensions: Length overall / water x beam x draught
214.00 ft / 214.00 ft x 30.00 ft x 20.00 ft (normal load)
65.23 m / 65.23 m x 9.14 m x 6.10 m

Armament:
1 - 5.12" / 130 mm guns in single mounts, 65.00lbs / 29.48kg shells, 1930 Model
Breech loading gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1926 Model
Anti-aircraft guns in deck mount
on centreline amidships
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 66 lbs / 30 kg
Shells per gun, main battery: 200
7 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 6,042 shp / 4,507 Kw = 20.00 kts
Range 8,600nm at 12.00 kts
Bunker at max displacement = 390 tons

Complement:
118 - 154

Cost:
£0.339 million / $1.357 million

Distribution of weights at normal displacement:
Armament: 9 tons, 0.6%
Machinery: 178 tons, 12.2%
Hull, fittings & equipment: 727 tons, 49.6%
Fuel, ammunition & stores: 253 tons, 17.3%
Miscellaneous weights: 300 tons, 20.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
480 lbs / 218 Kg = 7.2 x 5.1 " / 130 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.8 ft / 0.3 m
Roll period: 13.8 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: 0.400
Length to Beam Ratio: 7.13 : 1
'Natural speed' for length: 14.63 kts
Power going to wave formation at top speed: 57 %
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): 123.9%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 3,737 Square feet or 347 Square metres
Displacement factor (Displacement / loading): 202%
Structure weight / hull surface area: 120 lbs/sq ft or 586 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.76
- Longitudinal: 3.66
- Overall: 2.84
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

251 tons - ballast
49 tons - 28 Type 89 torpedoes
300 tons

Diving depth: 284 feet
Emergency Depth: 426 feet
Crush Depth: 710 feet

IC-II Class, Japan Coastal Submarine laid down 1932

IC-1, Japan Coastal Submarine laid down 1932

Displacement:
279 t light; 287 t standard; 318 t normal; 343 t full load

Dimensions: Length overall / water x beam x draught
115.00 ft / 115.00 ft x 21.00 ft x 11.50 ft (normal load)
35.05 m / 35.05 m x 6.40 m x 3.51 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 12 lbs / 6 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 977 shp / 729 Kw = 15.00 kts
Range 4,500nm at 10.00 kts
Bunker at max displacement = 56 tons

Complement:
36 - 48

Cost:
£0.069 million / $0.276 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.5%
Machinery: 29 tons, 9.1%
Hull, fittings & equipment: 163 tons, 51.3%
Fuel, ammunition & stores: 39 tons, 12.4%
Miscellaneous weights: 85 tons, 26.7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
37 lbs / 17 Kg = 2.9 x 3.0 " / 75 mm shells or 0.1 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.5 ft / 0.2 m
Roll period: 12.6 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: 0.401
Length to Beam Ratio: 5.48 : 1
'Natural speed' for length: 10.72 kts
Power going to wave formation at top speed: 62 %
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): 208.8%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 1,407 Square feet or 131 Square metres
Displacement factor (Displacement / loading): 204%
Structure weight / hull surface area: 79 lbs/sq ft or 386 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.91
- Longitudinal: 4.33
- Overall: 3.03
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
Caution: Lacks seaworthiness - very limited seakeeping ability

64 tons - ballast
21 tons - 12 Type 89 torpedoes
85 tons

Diving depth: 303 feet
Emergency Depth: 455 feet
Crush Depth: 758 feet

IC-III Class, Japan Coastal Submarine laid down 1932

Displacement:
432 t light; 444 t standard; 497 t normal; 539 t full load

Dimensions: Length overall / water x beam x draught
135.00 ft / 135.00 ft x 23.00 ft x 14.00 ft (normal load)
41.15 m / 41.15 m x 7.01 m x 4.27 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships
Weight of broadside 12 lbs / 6 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 1 shaft, 2,000 shp / 1,492 Kw = 17.00 kts
Range 3,650nm at 12.00 kts
Bunker at max displacement = 95 tons

Complement:
52 - 68

Cost:
£0.113 million / $0.450 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.3%
Machinery: 59 tons, 11.9%
Hull, fittings & equipment: 267 tons, 53.7%
Fuel, ammunition & stores: 64 tons, 13.0%
Miscellaneous weights: 105 tons, 21.1%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
126 lbs / 57 Kg = 9.8 x 3.0 " / 75 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.5 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: 0.400
Length to Beam Ratio: 5.87 : 1
'Natural speed' for length: 11.62 kts
Power going to wave formation at top speed: 63 %
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): 141.9%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 1,807 Square feet or 168 Square metres
Displacement factor (Displacement / loading): 210%
Structure weight / hull surface area: 95 lbs/sq ft or 466 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.03
- Longitudinal: 4.89
- Overall: 3.18
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

84 tons - ballast
21 tons - 12 Type 89 torpedoes
105 tons

Diving depth: 318 feet
Emergency Depth: 477 feet
Crush Depth: 795 feet

IC-IV class, Japan Coastal Submarine laid down 1936

Displacement:
352 t light; 361 t standard; 385 t normal; 405 t full load

Dimensions: Length overall / water x beam x draught
135.00 ft / 135.00 ft x 18.50 ft x 12.00 ft (normal load)
41.15 m / 41.15 m x 5.64 m x 3.66 m

Armament:
1 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1936 Model
Anti-aircraft gun in deck mount
on centreline forward
1 - 0.52" / 13.2 mm guns in single mounts, 0.07lbs / 0.03kg shells, 1936 Model
Machine gun in deck mount
on centreline amidships, 1 raised gun
Weight of broadside 1 lbs / 0 kg
Shells per gun, main battery: 1,500
3 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.30" / 33 mm 10.00 ft / 3.05 m 10.00 ft / 3.05 m (see below)

- Armour deck: 0.67" / 17 mm (see below)

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 525 shp / 392 Kw = 12.70 kts
Range 5,650nm at 8.00 kts
Bunker at max displacement = 44 tons

Complement:
43 - 56

Cost:
£0.076 million / $0.305 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0%
Armour: 33 tons, 8.6%
- Belts: 14 tons, 3.5%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 20 tons, 5.1%
- Conning Tower: 0 tons, 0.0%
Machinery: 15 tons, 3.8%
Hull, fittings & equipment: 229 tons, 59.5%
Fuel, ammunition & stores: 33 tons, 8.5%
Miscellaneous weights: 75 tons, 19.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
276 lbs / 125 Kg = 579.0 x 1.0 " / 25 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.4 ft / 0.1 m
Roll period: 11.8 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: 0.450
Length to Beam Ratio: 7.30 : 1
'Natural speed' for length: 11.62 kts
Power going to wave formation at top speed: 47 %
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): 71.3%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 1,593 Square feet or 148 Square metres
Displacement factor (Displacement / loading): 279%
Structure weight / hull surface area: 94 lbs/sq ft or 459 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.73
- Longitudinal: 4.00
- Overall: 3.75
Hull space for machinery, storage, compartmentation is excellent
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

Main belt used to sim 8 Type 89 torpedoes (14 tons)
Deck armor used to sim sonar (20 tons)

65 tons - ballast
10 tons Ninjatousaya System
75 tons

Diving depth: 375 feet
Emergency Depth: 563 feet
Crush Depth: 938 feet

(I should go and try to draw or borrow a gun to represent the forward 75mm gun on this boat...)

IO-V class, Japan Submarine laid down 1936
All submarines of the IO-V class transferred to Chosen in Q1/1944.

Displacement:
699 t light; 717 t standard; 810 t normal; 885 t full load

Dimensions: Length overall / water x beam x draught
175.00 ft / 175.00 ft x 24.00 ft x 15.00 ft (normal load)
53.34 m / 53.34 m x 7.32 m x 4.57 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1933 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
1 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1933 Model
Anti-aircraft gun in deck mount
on centreline amidships, 1 raised gun
Weight of broadside 14 lbs / 6 kg
Shells per gun, main battery: 200
5 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.48" / 38 mm 15.00 ft / 4.57 m 15.00 ft / 4.57 m (see below)

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 2,807 shp / 2,094 Kw = 17.70 kts
Range 8,500nm at 10.00 kts
Bunker at max displacement = 168 tons

Complement:
75 - 98

Cost:
£0.195 million / $0.780 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.2%
Armour: 32 tons, 3.9%
- Belts: 32 tons, 3.9%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 79 tons, 9.7%
Hull, fittings & equipment: 422 tons, 52.1%
Fuel, ammunition & stores: 111 tons, 13.7%
Miscellaneous weights: 165 tons, 20.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
322 lbs / 146 Kg = 25.0 x 3.0 " / 75 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 0.6 ft / 0.2 m
Roll period: 12.7 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: 0.450
Length to Beam Ratio: 7.29 : 1
'Natural speed' for length: 13.23 kts
Power going to wave formation at top speed: 58 %
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): 113.1%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 2,679 Square feet or 249 Square metres
Displacement factor (Displacement / loading): 220%
Structure weight / hull surface area: 105 lbs/sq ft or 511 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.17
- Longitudinal: 3.24
- Overall: 3.18
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


Main belt used to sim 18 Type 89 torpedoes (32 tons)

135 tons - ballast
20 tons Sonar
10 tons Ninjatousaya System
165 tons

Diving depth: 318 feet
Emergency Depth: 477 feet
Crush Depth: 795 feet

IO-VI class, Japan Submarine laid down 1936

Displacement:
1,614 t light; 1,654 t standard; 1,850 t normal; 2,006 t full load

Dimensions: Length overall / water x beam x draught
255.00 ft / 255.00 ft x 31.00 ft x 18.20 ft (normal load)
77.72 m / 77.72 m x 9.45 m x 5.55 m

Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline forward
1 - 2.95" / 75.0 mm guns in single mounts, 12.00lbs / 5.44kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline amidships
2 - 0.52" / 13.2 mm guns (1x2 guns), 0.07lbs / 0.03kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships, all raised guns - superfiring
2 - 0.30" / 7.7 mm guns (1x2 guns), 0.01lbs / 0.00kg shells, 1930 Model
Machine guns in deck mount
on centreline amidships, all raised guns - superfiring
Weight of broadside 24 lbs / 11 kg
Shells per gun, main battery: 200
10 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.82" / 46 mm 15.00 ft / 4.57 m 15.00 ft / 4.57 m (see below)

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 7,451 shp / 5,558 Kw = 20.75 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 352 tons

Complement:
140 - 183

Cost:
£0.467 million / $1.866 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.2%
Armour: 46 tons, 2.5%
- Belts: 46 tons, 2.5%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 209 tons, 11.3%
Hull, fittings & equipment: 976 tons, 52.8%
Fuel, ammunition & stores: 236 tons, 12.7%
Miscellaneous weights: 380 tons, 20.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
555 lbs / 252 Kg = 43.1 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 1.0 ft / 0.3 m
Roll period: 13.2 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: 0.450
Length to Beam Ratio: 8.23 : 1
'Natural speed' for length: 15.97 kts
Power going to wave formation at top speed: 55 %
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): 131.1%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 5,042 Square feet or 468 Square metres
Displacement factor (Displacement / loading): 213%
Structure weight / hull surface area: 133 lbs/sq ft or 647 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.20
- Longitudinal: 2.28
- Overall: 2.48
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


Main belt used to sim 26 Type 89 torpedoes (46 tons)

350 tons - ballast
20 tons Sonar
10 tons Ninjatousaya System
380 tons

Diving depth: 248 feet
Emergency Depth: 372 feet
Crush Depth: 620 feet

IO-VII class, Japan Submarine laid down 1936
Both submarines of the IO-VII class transferred to Chosen in Q1/1944.

Displacement:
1,483 t light; 1,523 t standard; 1,796 t normal; 2,015 t full load

Dimensions: Length overall / water x beam x draught
255.00 ft / 255.00 ft x 29.00 ft x 17.00 ft (normal load)
77.72 m / 77.72 m x 8.84 m x 5.18 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 34.00lbs / 15.42kg shells, 1936 Model
Dual purpose gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1936 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
1 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1936 Model
Anti-aircraft gun in deck mount
on centreline amidships, 1 raised gun
Weight of broadside 36 lbs / 16 kg
Shells per gun, main battery: 200
6 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.72" / 44 mm 15.00 ft / 4.57 m 15.00 ft / 4.57 m (see below)

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 9,382 shp / 6,999 Kw = 22.00 kts
Range 16,000nm at 10.00 kts
Bunker at max displacement = 492 tons

Complement:
137 - 179

Cost:
£0.488 million / $1.953 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.3%
Armour: 42 tons, 2.3%
- Belts: 42 tons, 2.3%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 263 tons, 14.7%
Hull, fittings & equipment: 813 tons, 45.3%
Fuel, ammunition & stores: 313 tons, 17.5%
Miscellaneous weights: 360 tons, 20.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
767 lbs / 348 Kg = 21.7 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.9 ft / 0.3 m
Roll period: 13.1 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: 0.500
Length to Beam Ratio: 8.79 : 1
'Natural speed' for length: 15.97 kts
Power going to wave formation at top speed: 60 %
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): 109.6%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 4,927 Square feet or 458 Square metres
Displacement factor (Displacement / loading): 186%
Structure weight / hull surface area: 114 lbs/sq ft or 556 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.90
- Longitudinal: 1.71
- Overall: 1.95
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


Main belt used to sim 24 Type 89 torpedoes (42 tons)

330 tons - ballast
20 tons Sonar
10 tons Ninjatousaya System
360 tons

Diving depth: 195 feet
Emergency Depth: 293 feet
Crush Depth: 488 feet

IO-VIII class, Japan Large submarine laid down 1936

Displacement:
4,429 t light; 4,594 t standard; 8,000 t normal; 10,725 t full load

Dimensions: Length overall / water x beam x draught
345.00 ft / 345.00 ft x 43.64 ft x 31.00 ft (normal load)
105.16 m / 105.16 m x 13.30 m x 9.45 m

Armament:
1 - 4.13" / 105 mm guns in single mounts, 34.00lbs / 15.42kg shells, 1930 Model
Dual purpose gun in deck mount
on centreline aft
9 - 0.98" / 25.0 mm guns (3x3 guns), 0.57lbs / 0.26kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
1 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1933 Model
Anti-aircraft gun in deck mount
on centreline amidships, 1 raised gun
Weight of broadside 40 lbs / 18 kg
Shells per gun, main battery: 200
8 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.73" / 44 mm 15.00 ft / 4.57 m 15.00 ft / 4.57 m (see below)

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 18,232 shp / 13,601 Kw = 21.00 kts
Range 37,500nm at 14.00 kts
Bunker at max displacement = 6,130 tons

Complement:
422 - 549

Cost:
£1.217 million / $4.869 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.1%
Armour: 56 tons, 0.7%
- Belts: 56 tons, 0.7%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 512 tons, 6.4%
Hull, fittings & equipment: 2,357 tons, 29.5%
Fuel, ammunition & stores: 3,571 tons, 44.6%
Miscellaneous weights: 1,500 tons, 18.7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,423 lbs / 3,367 Kg = 210.2 x 4.1 " / 105 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 1.6 ft / 0.5 m
Roll period: 14.5 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: 0.600
Length to Beam Ratio: 7.91 : 1
'Natural speed' for length: 18.57 kts
Power going to wave formation at top speed: 55 %
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): 55.3%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 11,010 Square feet or 1,023 Square metres
Displacement factor (Displacement / loading): 305%
Structure weight / hull surface area: 138 lbs/sq ft or 674 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.20
- Longitudinal: 2.02
- Overall: 2.06
Hull space for machinery, storage, compartmentation is excellent
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


Main belt used to sim 32 Type 89 torpedoes (56 tons)

1370 tons - ballast
20 tons Sonar
10 tons Ninjatousaya System
75 tons - 3 planes
25 tons - 1 catapult + crane
1500 tons

Diving depth: 206 feet
Emergency Depth: 309 feet
Crush Depth: 515 feet

I-300, Japan Experimental Submarine laid down 1940

5 submarines built to test out various design ideas to improve the abilities of future IJN submarines including torpedo loading, electric engines and batteries. This eventually led to the construction of the bigger I-305 in 1944.

Displacement:
1,069 t light; 1,099 t standard; 1,456 t normal; 1,742 t full load

Dimensions: Length overall / water x beam x draught
259.19 ft / 259.19 ft x 19.03 ft x 22.97 ft (normal load)
79.00 m / 79.00 m x 5.80 m x 7.00 m

Armament:
2 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1940 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
Weight of broadside 1 lbs / 1 kg
Shells per gun, main battery: 1,500
4 - 21.0" / 533.4 mm submerged torpedo tubes (all forward)

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Ends: Unarmoured
Upper: 1.69" / 43 mm 180.45 ft / 55.00 m 19.69 ft / 6.00 m (see below)

Machinery:
Oil fired boilers, steam turbines,
Electric cruising motors plus geared drives, 2 shafts, 4,673 shp / 3,486 Kw = 19.00 kts
Range 10,000nm at 14.00 kts
Bunker at max displacement = 643 tons

Complement:
117 - 153

Cost:
£0.330 million / $1.320 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0%
Armour: 242 tons, 16.6%
- Belts: 242 tons, 16.6%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 0 tons, 0.0%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 125 tons, 8.6%
Hull, fittings & equipment: 702 tons, 48.2%
Fuel, ammunition & stores: 387 tons, 26.6%
Miscellaneous weights: 0 tons, 0.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,592 lbs / 722 Kg = 3,340.3 x 1.0 " / 25 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.4 ft / 0.1 m
Roll period: 12.5 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: 0.450
Length to Beam Ratio: 13.62 : 1
'Natural speed' for length: 16.10 kts
Power going to wave formation at top speed: 40 %
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): 44.9%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 3,146 Square feet or 292 Square metres
Displacement factor (Displacement / loading): 296%
Structure weight / hull surface area: 102 lbs/sq ft or 496 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.82
- Longitudinal: 3.22
- Overall: 2.86
Hull space for machinery, storage, compartmentation is excellent
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

Upper belt used to sim ballast tank.
Speed (surface): 15.8 knots
Speed (submerged): 19 knots
Actual range (surface): 5,800nm at 14 knots
Range (submerged): 135nm at 3 knots
Diving depth: 286 feet
Test Depth (*): 358 feet
Emergency Depth: 458 feet
Crush Depth: 715 feet

Actual bunker size: 329 tons
10 Type 99 torpedoes: 18 tons (used bunker)
Ninjatousaya System: 10 tons (used bunker)
Experimental stuff: 286 tons (used bunker)

(*) read: Limit of a crew member's life insurance.

I-305, Japan Submarine laid down 1944
Ships: 5. I-305, I-306, I-307, I-308, I-309.

Displacement:
2,671 t light; 2,738 t standard; 3,328 t normal; 3,800 t full load

Dimensions: Length overall / water x beam x draught
280.00 ft / 280.00 ft x 26.00 ft (Bulges 32.00 ft) x 26.00 ft (normal load)
85.34 m / 85.34 m x 7.92 m (Bulges 9.75 m) x 7.92 m

Armament:
2 - 0.98" / 25.0 mm guns in single mounts, 0.57lbs / 0.26kg shells, 1944 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread
Weight of broadside 1 lbs / 1 kg
Shells per gun, main battery: 1,500
8 - 21.0" / 533.4 mm submerged torpedo tubes

Armour: (SEE BELOW)
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.11" / 54 mm 15.00 ft / 4.57 m 15.00 ft / 4.57 m
Ends: 8.20" / 208 mm 10.00 ft / 3.05 m 10.00 ft / 3.05 m
255.00 ft / 77.72 m Unarmoured ends
Main Belt covers 8% of normal length
Main belt does not fully cover magazines and engineering spaces

- Torpedo Bulkhead and Bulges:
1.20" / 30 mm 215.00 ft / 65.53 m 40.85 ft / 12.45 m

- Armour deck: 0.56" / 14 mm

Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 7,508 shp / 5,601 Kw = 19.00 kts
Range 25,000nm at 10.00 kts
Bunker at max displacement = 1,062 tons

Complement:
218 - 284

Cost:
£0.810 million / $3.240 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0%
Armour: 518 tons, 15.6%
- Belts: 78 tons, 2.3%
- Torpedo bulkhead: 390 tons, 11.7%
- Armament: 0 tons, 0.0%
- Armour Deck: 50 tons, 1.5%
- Conning Tower: 0 tons, 0.0%
Machinery: 192 tons, 5.8%
Hull, fittings & equipment: 1,391 tons, 41.8%
Fuel, ammunition & stores: 657 tons, 19.7%
Miscellaneous weights: 570 tons, 17.1%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,687 lbs / 1,219 Kg = 5,636.4 x 1.0 " / 25 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.7 ft / 0.2 m
Roll period: 16.4 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: 0.500
Length to Beam Ratio: 8.75 : 1
'Natural speed' for length: 16.73 kts
Power going to wave formation at top speed: 49 %
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): 268.9%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 4,850 Square feet or 451 Square metres
Displacement factor (Displacement / loading): 226%
Structure weight / hull surface area: 144 lbs/sq ft or 701 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.92
- Longitudinal: 2.98
- Overall: 2.93
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
Caution: Lacks seaworthiness - very limited seakeeping ability


Main belt used to sim 24 Type 3 torpedoes (48 tons).
Ends belt used to sim electric torpedo reloading system (30 tons).
560 tons miscellaneous weight for ballast.
10 tons miscellaneous weights for Ninjatousaya System.
Deck armor used to sim sonar, hydrophones and radar (50 tons).
TBH used to sim stronger pressure hull (30mm), allowing the submarine to dive deeper.
Increased Battery capacity: 413 tons for extra cells, simmed as part of the bunker.
Actual Bunker at max displacement = 649 tons.
Actual crew: 109-142.

Depths (numbers altered from baseline to reflect the thicker pressure hull)
Diving depth: 439 feet
Emergency Depth: 750 feet
Crush Depth: 1275 feet

Sangadila Class Submarine

Sangadila (Implacable), II-30, laid down 1937; acquired from India in 1945

Displacement:
3,260 t light; 3,387 t standard; 3,983 t normal; 4,460 t full load

Dimensions: Length overall / water x beam x draught
361.00 ft / 360.89 ft x 29.53 ft (Bulges 36.09 ft) x 23.79 ft (normal load)
110.03 m / 110.00 m x 9.00 m (Bulges 11.00 m) x 7.25 m

Armament:
2 - 8.27" / 210 mm guns (1x2 guns), 282.57lbs / 128.17kg shells, 1937 Model
Breech loading guns in a turret (on a barbette)
on centreline forward
2 - 1.38" / 35.0 mm guns in single mounts, 1.31lbs / 0.59kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on centreline, evenly spread
4 - 0.59" / 15.0 mm guns (2x2 guns), 0.10lbs / 0.05kg shells, 1937 Model
Machine guns in deck mounts
on centreline, evenly spread
Weight of broadside 568 lbs / 258 kg
Shells per gun, main battery: 150
6 - 21.7" / 550 mm submerged torpedo tubes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.92" / 125 mm 1.18" / 30 mm 4.92" / 125 mm

- Conning tower: 0.79" / 20 mm

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 6,205 shp / 4,629 Kw = 18.00 kts
Range 14,000nm at 12.00 kts
Bunker at max displacement = 1,073 tons

Complement:
249 - 325

Cost:
£1.079 million / $4.316 million

Distribution of weights at normal displacement:
Armament: 71 tons, 1.8 %
Armour: 34 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 29 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 4 tons, 0.1 %
Machinery: 172 tons, 4.3 %
Hull, fittings & equipment: 2,183 tons, 54.8 %
Fuel, ammunition & stores: 723 tons, 18.2 %
Miscellaneous weights: 800 tons, 20.1 %
Indian copy of Ninjatousaya System fitted.

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3,165 lbs / 1,436 Kg = 11.2 x 8.3 " / 210 mm shells or 1.3 torpedoes
Stability (Unstable if below 1.00): 1.00
Metacentric height 0.8 ft / 0.2 m
Roll period: 16.9 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: 0.450
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 19.00 kts
Power going to wave formation at top speed: 36 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.10 ft / 0.03 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.10 ft / 0.03 m
- Forecastle (30 %): 0.10 ft / 0.03 m
- Mid (0 %): 0.10 ft / 0.03 m
- Quarterdeck (55 %): 0.10 ft / 0.03 m
- Stern: 0.10 ft / 0.03 m
- Average freeboard: 0.10 ft / 0.03 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63.3 %
- Above water (accommodation/working, high = better): 0.5 %
Waterplane Area: 6,797 Square feet or 631 Square metres
Displacement factor (Displacement / loading): 228 %
Structure weight / hull surface area: 179 lbs/sq ft or 874 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.92
- Longitudinal: 1.99
- Overall: 2.19
Hull space for machinery, storage, compartmentation is excellent
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

I-310 Japanese Submarine
Ships: I-310, I-311, I-312, I-313.

Date: 1946
Type: Oceanic
Length: 95.00m
Beam: 9.20m
Draft: 9.80m
Crush depth: 317.5m
Light Displacement 3189t
Loaded Displacement 3837t
Full Displacement 4283t
wt fuel&batts: 1275t
Reserve buoyancy: 10%
Armament:
- 8 x 533mm (bow)
- 2x1 25mm MGs (1 from sim, 1 from misc weights)
- 48 tons for mines or reload torpedoes
ElecHP: 15500hp
DieselHP: 7000hp
Speed:
- Max Surf Speed: 15.6 knots
- Max Sub Speed: 20.2 knots
Range:
- Surfaced: 18,342nm@10 knots
- Submerged: 415nm@5 knots
Tons Oil: 675.0t
Tons Battery: 600.0t
Miscellaneous Weight: 300 tons
Crew: 110

- 32 Type 3 torpedoes (= 8 in the tubes + 24 from the 48 tons for 'mines or reload torpedoes'), though usually 28 carried with 4 idle positions to permit withdrawal of torpedoes from tubes for servicing.
- Diesel-electric drive.
- Main electric engines output: 15,000 shp.
- Silent running engines output: 500 shp.
- Surface speed: (diesel-electric) 15.6 knots, (battery-electric) 20.8 knots.
- Submerged speed: (silent running engines) 6.4 knots, (battery-electric) 20.0 knots, (diesel-electric + Ninjatousaya) 10.1 knots.
- Range Surfaced (diesel-Electric): 22,645nm@9 knots, 18,342nm@10 knots, 12,738nm@12 knots, 8,152nm@15 knots.
- Range Submerged (batteries, silent running engines): 1,192nm@3 knots, 415nm@5 knots, 279nm@6 knots.
- Range Submerged (batteries, main engines): 143nm@8 knots, 80nm@10 knots, 22nm@15 knots.
- Range Submerged (diesel-electric + Ninjatousaya): 22,200nm@6 knots, 12,100nm@8 knots, 7,950@10 knots.
- Endurance: (surfaced) 76 days and 10 hours @ 10 knots, (submerged, batteries) 3 days and 11 hours @ 5 knots
- Diving depth: 417 feet
- Emergency Depth: 667 feet
- Crush Depth: 1042 feet
- 300 tons Miscellaneous weights breakdown:
--- 30 tons for electric torpedo reloading system
--- 5 tons for torpedo service material
--- 1 ton for extra single 25mm machinegun
--- 10 tons for Ninjatousaya System
--- 60 tons for sonar, hydrophones and radar
--- 10 tons for defense countermeasures and 'camouflage'
--- 32 tons for air condition system
--- 4 tons for 80 oxygen bottles (50 l, 150 atm, about 210 hours of oxygen total).
--- 5 tons CO2 removal system + Soda lime
--- 32 tons for damage control and fire suppression systems
--- 10 tons for demagnetization cables
--- 8 tons for safety and rescue equipment
--- 15 tons for yatai mobile food stall (well, mobile since the sub moves around)
--- 20 tons for pachinko parlor
--- 15 tons for karaoke facilities + Kobe Cola vending machines
--- 20 tons for officer's lounge
--- 4 tons for deep freeze unit
--- 5 tons for desalinization gear
--- 14 tons for various