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Japan's Naval Developments - Q1/1936

A. Industrial Allocation

27/27 factories producing warship material = 27,000 t. 15,085 tons stockpiled materials available. 6740 tons transferred to Japan. Total materials available: 48,825 t. 44,578 t are used. 4,247 t materials stockpiled.

0/27 factories are dedicated to producing infrastructure material, = 0x 0.1 = 0.0 points.

B. Infrastructure Development

None.

C. Naval Construction


Kure Navy Yard, Kure (Honshu)
Slip V-1A => BB Honjou Kamatari laid down 1/1/1936. Receives 750 tons.
Slip I-1A => I-400 laid down 1/1/1936. Receives 753 tons.
Slip I-1B => I-401 laid down 1/1/1936. Receives 753 tons.
Dock V-1A => idle.
Free-floating: BB Okuni receives 3000 tons.
Free-floating: BB Inahime receives 3000 tons.

Yokosuka Navy Yard, Yokosuka (Honshu)
Slip V-2A => BB Mitarai Toukichirou laid down 1/1/1936. Receives 750 tons.
Slip I-2A => I-256 laid down 1/1/1936. Receives 450 tons.
Slip I-2B => I-226 laid down 1/1/1936. Receives 210 tons.
Dock 0-2A => I-163 laid down 1/1/1936. Receives 240 tons.
Free-floating: BB Nene receives 3000 tons.

Kawasaki Co, Kobe (Honshu)
Slip V-3A => CV Kei laid down 1/1/1936. Receives 750 tons.
Slip II-3A => CL Eba laid down 1/1/1936. Receives 750 tons.
Slip I-3A => I-227 laid down 1/1/1936. Receives 210 tons.
Dock II-3A => Burijas laid down 1/1/1936. Receives 553 tons.
Free-floating: BC Ginchiyo receives 2340 tons.

Mitsubushi Co, Nagasaki (Kyushu)
Slip V-4A => CV Yuri laid down 1/1/1936. Receives 750 tons.
Slip II-4A => CL Furoura laid down 1/1/1936. Receives 750 tons.
Slip I-4A => I-228 laid down 1/1/1936. Receives 210 tons.
Dock II-4A => I-257 laid down 1/1/1936. Receives 450 tons.
Free-floating: BC Nouhime receives 2340 tons.

Fukuoka Navy Yard, Fukuoka (Kyushu)
Slip III-5A => CL Arishia laid down 1/1/1936. Receives 750 tons.
Slip II-5A => Ticao receives 1110 tons.
Slip I-5A => I-229 laid down 1/1/1936. Receives 210 tons.
Dock IV-5A => idle.
Free-floating: BC Oichi receives 2340 tons.
Free-floating: CB Kongo receives 2001 tons.

Hakodate Navy Yard, Hakodate (Hokkaido)
Slip III-6A => CL Besu laid down 1/1/1936. Receives 750 tons.
Slip II-6A => Tablas receives 1110 tons.
Slip I-6A => I-230 laid down 1/1/1936. Receives 210 tons
Free-floating: CB Haruna receives 2001 tons.

Aomori Navy Yard, Aomori (Honshu)
Slip III-7A => CL Garatea laid down 1/1/1936. Receives 750 tons.
Slip I-7A => Vouruskasha receives 435 tons. Launched 2/8/1936.
Dock I-7A => I-167 laid down 1/1/1936. Receives 240 tons.
Free-floating: MABdG Independencia receives 1200 tons. Completed 3/1/1936.

Kagoshima Navy Yard, Kagoshima (Kyushu)
Slip III-8A => CL Ofiiria laid down 1/1/1936. Receives 750 tons.
Slip I-8A => Hormoz receives 435 tons. Launched 2/8/1936.
Dock I-8A => I-168 laid down 1/1/1936. Receives 240 tons.
Slip 0-8A => I-161 laid down 1/1/1936. Receives 240 tons.
Slip 0-8B => I-162 laid down 1/1/1936. Receives 240 tons.
Dock 0-8A => I-164 laid down 1/1/1936. Receives 240 tons.
Free-floating: MABdG Guardabosques receives 1200 tons. Completed 3/1/1936.

Wakayama Navy Yard, Wakayama (Honshu)
Slip III-9A => CL Rafaera laid down 1/1/1936. Receives 750 tons.
Slip I-9A => Khalij-e fars receives 435 tons. Launched 2/8/1936.
Dock I-9A => I-169 laid down 1/1/1936. Receives 240 tons.
Free-floating: CB Hiei receives 2001 tons.

Tokushima Navy Yard, Tokushima (Shikoku)
Slip III-10A => CL Miria laid down 1/1/1936. Receives 750 tons.
Slip I-10A => Dariae Mazenderan receives 435 tons. Launched 2/8/1936.
Dock I-10A => I-170 laid down 1/1/1936. Receives 240 tons.
Free-floating: CB Kirishima receives 2001 tons.

Niigata Navy Yard, Niigata (Honshu)
Slip I-11A => I-274 laid down 1/1/1936. Receives 420 tons.
Slip I-11B => I-275 laid down 1/1/1936. Receives 420 tons.
Dock III-11A => Asto Vidatu laid down 1/1/1936. Receives 553 tons.

Niihama Navy Yard, Niihama (Shikoku)
Slip I-12A => I-165 laid down 1/1/1936. Receives 240 tons.
Slip I-12B => I-166 laid down 1/1/1936. Receives 240 tons.
Dock III-12A => idle.


MTB 1-16 receive total of 192 tons (16x12 tons).
MTB 129-158 receive total of 270 tons (30x9 tons).
MTB 369-376 receive total of 176 tons (8x22 tons).

D. Transactions
1840t received from Argentina.
2400t received from the Philippines.
1500t received from Persia.

E. Other Notes
Independencia and Guardabosques starting shakedown cruises.
Atena Guourii (Undine class CL) completing shakedown cruises.

New units laid down this quarter:
- Kei and Yuri (RE class CVA) requiring 35000 tons and 44 months each.
- Yamato no Kamatari and Musashi no Toukichirou (Yamato class BB) requiring 75000 tons and 84 months each.
- Arishia, Besu, Garatea, Ofiiria, Rafaera, Miria, Eba and Furoura (Kureimoa class CL) requiring 2830 tons and 12 months each.
- I-161, I-162, I-163, I-164, I-165, I-166, I-167, I-168, I-169 and I-170 (IC-IV class SS) requiring 353 tons and 5 months each.
- I-226, I-227, I-228, I-229 and I-230 (IO-V class SS) requiring 698 tons and 10 months each.
- I-256 and I-257 (IO-VI class SS) requiring 1614 tons and 11 months each.
- I-274 and I-275 (IO-VII class SS) requiring 1467 tons and 10.5 months each.
- I-400 and I-401 (IO-VIII class SS) requiring 3071 tons and 12.5 months each.
- MTB 1-16 (MTB T 1) requiring 12 ton each.
- MTB 129-158 (MTB T 2) requiring 9 tons each.
- MTB 369-376 (MTB T 3) requiring 22 tons each.
- Burijas and Asto Vidatu for Persia requiring 2203 tons and 11.5 months each.

Repairs.
None

Refits
FSS: F-1 through 14 requiring 143 tons and 2.5 months each.

F. Updated Order of Battle, 3/31/36

Note: X(Y)+Z = completed (under repair/refit) + under construction

Battleships: 9(0)+5
Battlecruisers: 0(0)+3
Large Cruisers: 0(0)+4
Heavy Cruisers: 9(0)+0
Light Cruisers: 41(0)+8
Large Aircraft Carriers: 0(0)+2
Aircraft Carriers: 4(0)+0
Light Aircraft Carriers: 2(0)+0
Destroyer Leader: 18(0)+0
Destroyers class 1: 15(0)+0
Destroyers class 2: 74(0)+0
Destroyers class 3: 208(15)+0
Ocean Going Submarines: 30(0)+11
Coastal Submarines: 132(0)+10
Midget Submarines: 135(0)+0
Coast Defense Vessels: 12(0)+0
Training carrier: 1(0)+0
Training Cruisers: 3(0)+0
Gunboats: 46(0)+0
Minelayers: 27(0)+0
Minesweepers: 18(0)+0
Submarine Chasers class 1: 30(0)+0
Submarine Chasers class 2: 42(0)+0
Corvettes: 30(0)+0
Patrol boats: 111(0)+0
MPV: 9(0)+0
CCB: 10(0)+0
MTB: 115(0)+54
Exploration ships: 2(0)+0
Museum ships: 4(0)+0

Foreign orders:
Carriers: 2. completed.
Light Cruisers: 3
Destroyers: 6

Chosen's Naval Developments - Q1/1936

A. Industrial Allocation

0/4 factories producing warship material = 0 t. 0t stockpiled materials available. 0 t are used, 0 tons materials stockpiled.

4/4 factories are dedicated to producing infrastructure material = 0.4 pts.

B. Infrastructure Development
0.4 points spent on type 1 slip at Ryojun.

C. Naval Construction

Ryojun
S1: under construction. 0.6 points still needed.
S1: idle
D0: idle
D1: idle

Dairen
D0: idle
D1: idle
D2: idle

D. Transactions
None

E. Other Notes

New units laid down this quarter:
None

F. Updated Order of Battle, 3/31/36

Note: X(Y)+Z = completed (under repair/refit) + under construction

Battle Cruiser: 1(0)+0
Carrier: 1(0)+0
Heavy Cruiser: 1(0)+0
Armored Cruiser: 1(0)+0
1st class Cruiser: 2(0)+0
Light Cruiser: 3(0)+0
2nd class Cruiser: 3(0)+0
Protected Cruiser: 4(0)+0
Gunboats: 2(1)+0
River Gunboats: 2(0)+0
Destroyers 2nd class: 13(0)+0
Destroyers 3rd class: 6(0)+0
TPB 1st class: 6(0)+0
TPB 2nd class: 7(0)+0

Pacifica's Naval Developments - Q1/1936

A. Industrial Allocation

0/1 factories producing warship material = 0 t. 0 tons stockpiled materials available. 0 t are used, 0 tons materials stockpiled.

1/1 factories are dedicated to producing infrastructure material = 0.1 pts.

B. Infrastructure Development
0.1 points spent on type 0 slip at Agana.

C. Naval Construction

Agana (Guam)
S0: under construction. 0.4 points still needed.
D1A: idle
D1B: idle
D0: idle

D. Transactions
None

E. Other Notes

New units laid down this quarter:
None

F. Updated Order of Battle, 3/31/36

Note: X(Y)+Z = completed (under repair/refit) + under construction

Armored Cruiser: 1(0)+0
Light Cruiser: 2(0)+0
Destroyers: 3(0)+0
TPB/DDE: 2(0)+0

RE, Japan Carrier laid down 1936

Displacement:
35,000 t light; 36,106 t standard; 39,299 t normal; 41,854 t full load

Dimensions: Length overall / water x beam x draught
834.21 ft / 810.00 ft x 90.00 ft (Bulges 100.00 ft) x 32.00 ft (normal load)
254.27 m / 246.89 m x 27.43 m (Bulges 30.48 m) x 9.75 m

Armament:
8 - 5.00" / 127 mm guns (4x2 guns), 55.12lbs / 25.00kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, 2 raised mounts - superfiring
16 - 4.13" / 105 mm guns (8x2 guns), 34.00lbs / 15.42kg shells, 1936 Model
Dual purpose guns in deck mounts with hoists
on side ends, evenly spread
32 - 1.57" / 40.0 mm guns (4x8 guns), 2.00lbs / 0.91kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships
42 - 0.98" / 25.0 mm guns (14x3 guns), 0.57lbs / 0.26kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
32 - 0.52" / 13.2 mm guns (4x8 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mounts
on side ends, evenly spread
Weight of broadside 1,076 lbs / 488 kg
Shells per gun, main battery: 450

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 510.00 ft / 155.45 m 12.00 ft / 3.66 m
Ends: 15.0" / 381 mm 26.00 ft / 7.92 m 26.00 ft / 7.92 m (*)
274.00 ft / 83.52 m Unarmoured ends
Upper: 3.00" / 76 mm 750.00 ft / 228.60 m 18.00 ft / 5.49 m
Main Belt covers 97% of normal length

- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 510.00 ft / 155.45 m 28.00 ft / 8.53 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm -
4th: 1.00" / 25 mm 1.00" / 25 mm -
5th: 0.50" / 13 mm 0.50" / 13 mm -

- Armour deck: 4.00" / 102 mm, Conning tower: 2.75" / 70 mm

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 176,627 shp / 131,764 Kw = 33.00 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 5,748 tons

Complement:
1,395 - 1,814

Cost:
£10.754 million / $43.016 million

Distribution of weights at normal displacement:
Armament: 144 tons, 0.4%
Armour: 9,164 tons, 23.3%
- Belts: 4,050 tons, 10.3%
- Torpedo bulkhead: 1,057 tons, 2.7%
- Armament: 141 tons, 0.4%
- Armour Deck: 3,848 tons, 9.8%
- Conning Tower: 68 tons, 0.2%
Machinery: 4,956 tons, 12.6%
Hull, fittings & equipment: 10,737 tons, 27.3%
Fuel, ammunition & stores: 4,299 tons, 10.9%
Miscellaneous weights: 10,000 tons, 25.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
55,793 lbs / 25,307 Kg = 892.7 x 5.0 " / 127 mm shells or 8.0 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 5.5 ft / 1.7 m
Roll period: 18.0 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.24

Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.531
Length to Beam Ratio: 8.10 : 1
'Natural speed' for length: 32.92 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 4.00 ft / 1.22 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 35.00 ft / 10.67 m
- Forecastle (20%): 25.00 ft / 7.62 m
- Mid (50%): 25.00 ft / 7.62 m
- Quarterdeck (15%): 25.00 ft / 7.62 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 25.73 ft / 7.84 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93.6%
- Above water (accommodation/working, high = better): 177.5%
Waterplane Area: 51,995 Square feet or 4,831 Square metres
Displacement factor (Displacement / loading): 130%
Structure weight / hull surface area: 133 lbs/sq ft or 650 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.13
- 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

(*) simmed using ends armor

Aircraft: 95 planes (9025 tons) + 15 spare planes (375 tons ends armor)
100 tons flag facilities
875 tons extras

[SIZE=1]Picture is a slightly modified version of CanisD's picture of his hypothetical fast Yamato. Used with his permission.[/SIZE]

Yamato, Japan Senkan laid down 1936

Displacement:
75,000 t light; 79,312 t standard; 85,791 t normal; 90,973 t full load

Dimensions: Length overall / water x beam x draught
961.89 ft / 940.00 ft x 122.00 ft (Bulges 132.00 ft) x 37.00 ft (normal load)
293.18 m / 286.51 m x 37.19 m (Bulges 40.23 m) x 11.28 m

Armament:
9 - 18.11" / 460 mm guns (3x3 guns), 3,913.21lbs / 1,775.00kg shells, 1936 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
6 - 5.91" / 150 mm guns (2x3 guns), 105.00lbs / 47.63kg shells, 1932 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
40 - 5.00" / 127 mm guns (20x2 guns), 55.12lbs / 25.00kg shells, 1932 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
48 - 1.57" / 40.0 mm guns (6x8 guns), 2.00lbs / 0.91kg shells, 1923 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
96 - 0.98" / 25.0 mm guns (32x3 guns), 0.57lbs / 0.26kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 12 raised mounts
104 - 0.52" / 13.2 mm guns (26x4 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread, 10 raised mounts
Weight of broadside 38,246 lbs / 17,348 kg
Shells per gun, main battery: 120

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.9" / 429 mm 520.00 ft / 158.50 m 16.50 ft / 5.03 m
Ends: 14.0" / 356 mm 120.00 ft / 36.58 m 8.00 ft / 2.44 m
300.00 ft / 91.44 m Unarmoured ends
Upper: 2.25" / 57 mm 520.00 ft / 158.50 m 28.00 ft / 8.53 m
Main Belt covers 85% of normal length

- Torpedo Bulkhead and Bulges:
3.00" / 76 mm 520.00 ft / 158.50 m 50.00 ft / 15.24 m

- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 26.0" / 660 mm 15.0" / 381 mm 20.0" / 508 mm
2nd: 6.00" / 152 mm 3.00" / 76 mm 4.00" / 102 mm
3rd: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
4th: 1.00" / 25 mm 1.00" / 25 mm -
5th: 1.00" / 25 mm 1.00" / 25 mm -
6th: 0.50" / 13 mm 0.50" / 13 mm -

- Armour deck: 9.00" / 229 mm, Conning tower: 20.00" / 508 mm

Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Geared drive, 4 shafts, 200,000 shp / 149,200 Kw = 29.91 kts
Range 10,000nm at 18.00 kts
Bunker at max displacement = 11,661 tons

Complement:
2,506 - 3,258

Cost:
£34.889 million / $139.557 million

Distribution of weights at normal displacement:
Armament: 3,817 tons, 4.4%
Armour: 33,724 tons, 39.3%
- Belts: 8,380 tons, 9.8%
- Torpedo bulkhead: 2,886 tons, 3.4%
- Armament: 6,301 tons, 7.3%
- Armour Deck: 15,318 tons, 17.9%
- Conning Tower: 838 tons, 1.0%
Machinery: 5,612 tons, 6.5%
Hull, fittings & equipment: 30,647 tons, 35.7%
Fuel, ammunition & stores: 10,791 tons, 12.6%
Miscellaneous weights: 1,200 tons, 1.4%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
136,700 lbs / 62,006 Kg = 46.0 x 18.1 " / 460 mm shells or 27.0 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 9.2 ft / 2.8 m
Roll period: 18.2 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.02

Hull form characteristics:
Hull has low quarterdeck
and transom stern
Block coefficient: 0.654
Length to Beam Ratio: 7.12 : 1
'Natural speed' for length: 35.38 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 49
Bow angle (Positive = bow angles forward): 35.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 28.40 ft / 8.66 m
- Forecastle (31%): 18.60 ft / 5.67 m
- Mid (43%): 23.50 ft / 7.16 m
- Quarterdeck (7%): 16.60 ft / 5.06 m (23.50 ft / 7.16 m before break)
- Stern: 16.60 ft / 5.06 m
- Average freeboard: 22.42 ft / 6.83 m
Ship tends to be wet forward

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 69.4%
- Above water (accommodation/working, high = better): 161.0%
Waterplane Area: 92,002 Square feet or 8,547 Square metres
Displacement factor (Displacement / loading): 112%
Structure weight / hull surface area: 250 lbs/sq ft or 1,221 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.00
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent

- 16" Kai34 on 0.875" STS plate inclined 20 degrees. 2.25" STS outer hull shell (decapping plate (=upper belt)).
- Bulbous bow and improved fitting of the shaft brackets and the bilge keels for reduction in the hull resistance, resulting in higher speed and better fuel efficiency.
- 1.25-2" CNC and DS forecastle deck. 8-9" MNC armored deck over the vitals, 13.4" VH in front of A turret and behind X turret (sloped), 15" perforated MNC plates over the boiler uptakes. 2-3.15" CNC floors of the ammunition magazines.
- Main rudder room protected by armored box with 16" sides and 8" MNC top. Auxiliary rudder room protected by armored box with 12" sides and 8" MNC top.
- 60 APC - 1825 kg and 60 HEH - 1725 kg. Also able to use SSA 'San Shiki' AA projectiles (1600 kg) and HEL projectiles (1400 kg).
- Transom stern for the use of the 'Hain mat' system.
- Type 93 Fire Control System, superior to any other FCS in the world.
- High quality optics and 15m rangefinder allow for exceptional range estimation and a high degree of accuracy in shooting.
- Semi-automatic loading system for the 5 inch/40 caliber Type 93 secondary gun.

Kureimoa, Japan CL laid down 1936

Displacement:
2,830 t light; 2,998 t standard; 3,469 t normal; 3,846 t full load

Dimensions: Length overall / water x beam x draught
488.51 ft / 472.50 ft x 44.00 ft x 14.60 ft (normal load)
148.90 m / 144.02 m x 13.41 m x 4.45 m

Armament:
8 - 5.00" / 127 mm guns (4x2 guns), 55.12lbs / 25.00kg shells, 1935 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1.97" / 50.0 mm guns (4x2 guns), 4.00lbs / 1.81kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, all amidships
12 - 0.98" / 25.0 mm guns (4x3 guns), 0.57lbs / 0.26kg shells, 1934 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
16 - 0.52" / 13.2 mm guns (4x4 guns), 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 481 lbs / 218 kg
Shells per gun, main battery: 350
15 - 24.0" / 609.6 mm above water torpedoes

Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 1.00" / 25 mm 2.00" / 51 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm -
3rd: 1.00" / 25 mm 1.00" / 25 mm -
4th: 0.50" / 13 mm 0.50" / 13 mm -

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 52,605 shp / 39,244 Kw = 34.50 kts
Range 7,700nm at 15.00 kts
Bunker at max displacement = 848 tons

Complement:
225 - 293

Cost:
£1.920 million / $7.679 million

Distribution of weights at normal displacement:
Armament: 80 tons, 2.3%
Armour: 62 tons, 1.8%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 62 tons, 1.8%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 1,415 tons, 40.8%
Hull, fittings & equipment: 943 tons, 27.2%
Fuel, ammunition & stores: 639 tons, 18.4%
Miscellaneous weights: 330 tons, 9.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,054 lbs / 478 Kg = 16.9 x 5.0 " / 127 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.8 ft / 0.5 m
Roll period: 13.8 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.07

Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.400
Length to Beam Ratio: 10.74 : 1
'Natural speed' for length: 25.00 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 65
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.00 ft / 7.92 m
- Forecastle (20%): 19.25 ft / 5.87 m
- Mid (60%): 19.25 ft / 5.87 m (11.25 ft / 3.43 m aft of break)
- Quarterdeck (15%): 11.25 ft / 3.43 m
- Stern: 11.25 ft / 3.43 m
- Average freeboard: 16.59 ft / 5.06 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 161.1%
- Above water (accommodation/working, high = better): 63.8%
Waterplane Area: 13,281 Square feet or 1,234 Square metres
Displacement factor (Displacement / loading): 87%
Structure weight / hull surface area: 41 lbs/sq ft or 202 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 1.01
- Overall: 0.54
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform

Miscellaneous weights breakdown:
138 tons - FCS (including Tomoe Tele Raypointer = 15 tons, Sonar = 8 tons and fire control center = 20 tons)
120 tons - Improved weapon operating systems (loading, elevation and train control)
42 tons -- 15 24" torpedoes (at 2.75 tons/torpedo)
4 tons --- 2x Depth Charge Racks (for 6-16 100 kg, 4-12 160 kg or 3-8 300 kg depth charges).
15 tons -- Depth Charges (100 kg, 160 kg and/or 300 kg)
6 tons --- 6x Depth Charge Projector
5 tons -- 30 Depth Charges (160 kg) for the DCPs.

IC-IV class, Japan Coastal Submarine laid down 1936

Displacement:
353 t light; 383 t standard; 495 t normal; 518 t full load

Dimensions: Length overall / water x beam x draught
150.00 ft / 150.00 ft x 17.50 ft x 12.00 ft (normal load)
45.72 m / 45.72 m x 5.33 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

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 599 shp / 447 Kw = 12.70 kts
Range 5,650nm at 8.00 kts
Bunker at max displacement = 51 tons

Complement:
52 - 68

Cost:
£0.097 million / $0.387 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0%
Machinery: 17 tons, 3.4%
Hull, fittings & equipment: 335 tons, 67.7%
Fuel, ammunition & stores: 39 tons, 7.9%
Miscellaneous weights: 104 tons, 21.0%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
371 lbs / 168 Kg = 777.9 x 1.0 " / 25 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 0.4 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: 8.57 : 1
'Natural speed' for length: 12.25 kts
Power going to wave formation at top speed: 46 %
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): 68.3%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 1,832 Square feet or 170 Square metres
Displacement factor (Displacement / loading): 358%
Structure weight / hull surface area: 118 lbs/sq ft or 578 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.84
- Longitudinal: 3.68
- Overall: 3.94
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


83 tons - Ballast
21 tons - 12 torpedoes

Diving depth: 394 feet
Emergency Depth: 591 feet
Crush Depth: 985 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

Displacement:
698 t light; 756 t standard; 1,039 t normal; 1,125 t full load

Dimensions: Length overall / water x beam x draught
200.00 ft / 200.00 ft x 23.45 ft x 15.50 ft (normal load)
60.96 m / 60.96 m x 7.15 m x 4.72 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

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 3,094 shp / 2,308 Kw = 17.70 kts
Range 8,500nm at 10.00 kts
Bunker at max displacement = 194 tons

Complement:
90 - 118

Cost:
£0.240 million / $0.958 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.2%
Machinery: 87 tons, 8.4%
Hull, fittings & equipment: 604 tons, 58.2%
Fuel, ammunition & stores: 130 tons, 12.6%
Miscellaneous weights: 215 tons, 20.7%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
559 lbs / 254 Kg = 43.5 x 3.0 " / 75 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.6 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: 0.500
Length to Beam Ratio: 8.53 : 1
'Natural speed' for length: 14.14 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): 94.5%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 3,125 Square feet or 290 Square metres
Displacement factor (Displacement / loading): 258%
Structure weight / hull surface area: 126 lbs/sq ft or 616 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.83
- Longitudinal: 2.97
- Overall: 3.16
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

175 tons - ballast
35 tons - 20 torpedoes
5 tons - Sonar

Diving depth: 316 feet
Emrgency Depth: 474 feet
Crush Depth: 790 feet

IO-VI class, Japan Submarine laid down 1936

Displacement:
1,614 t light; 1,715 t standard; 2,334 t normal; 2,518 t full load

Dimensions: Length overall / water x beam x draught
295.00 ft / 295.00 ft x 28.40 ft x 19.50 ft (normal load)
89.92 m / 89.92 m x 8.66 m x 5.94 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

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 8,116 shp / 6,055 Kw = 20.75 kts
Range 11,000nm at 10.00 kts
Bunker at max displacement = 414 tons

Complement:
167 - 218

Cost:
£0.562 million / $2.246 million

Distribution of weights at normal displacement:
Armament: 3 tons, 0.1%
Machinery: 228 tons, 9.8%
Hull, fittings & equipment: 1,376 tons, 59.0%
Fuel, ammunition & stores: 280 tons, 12.0%
Miscellaneous weights: 447 tons, 19.2%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
988 lbs / 448 Kg = 76.8 x 3.0 " / 75 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.8 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: 0.500
Length to Beam Ratio: 10.39 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 50 %
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): 109.8%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 5,582 Square feet or 519 Square metres
Displacement factor (Displacement / loading): 251%
Structure weight / hull surface area: 158 lbs/sq ft or 770 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.86
- Longitudinal: 2.19
- Overall: 2.52
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

389 tons - ballast
53 tons - 30 torpedoes
5 tons - Sonar

Diving depth: 252 feet
Emergency Depth: 378 feet
Crush Depth: 630 feet

IO-VII class, Japan Submarine laid down 1936

Displacement:
1,467 t light; 1,565 t standard; 2,257 t normal; 2,509 t full load

Dimensions: Length overall / water x beam x draught
280.00 ft / 280.00 ft x 28.50 ft x 18.00 ft (normal load)
85.34 m / 85.34 m x 8.69 m x 5.49 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 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 aft, 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 36 lbs / 16 kg
Shells per gun, main battery: 200
6 - 21.0" / 533.4 mm submerged torpedo tubes

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 12,519 shp / 9,339 Kw = 23.00 kts
Range 16,000nm at 10.00 kts
Bunker at max displacement = 568 tons

Complement:
163 - 212

Cost:
£0.629 million / $2.516 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.2%
Machinery: 351 tons, 15.6%
Hull, fittings & equipment: 1,106 tons, 49.0%
Fuel, ammunition & stores: 365 tons, 16.2%
Miscellaneous weights: 431 tons, 19.1%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
993 lbs / 451 Kg = 28.1 x 4.1 " / 105 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 0.8 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: 0.550
Length to Beam Ratio: 9.82 : 1
'Natural speed' for length: 16.73 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): 107.7%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 5,569 Square feet or 517 Square metres
Displacement factor (Displacement / loading): 193%
Structure weight / hull surface area: 134 lbs/sq ft or 653 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.33
- Longitudinal: 1.72
- Overall: 2.03
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

377 tons - ballast
49 tons - 28 torpedoes
5 tons - Sonar

Diving depth: 203 feet
Emergency Depth: 305 feet
Crush Depth: 508 feet

IO-VIII class, Japan Large submarine laid down 1936

Displacement:
3,071 t light; 3,278 t standard; 8,000 t normal; 10,710 t full load

Dimensions: Length overall / water x beam x draught
375.00 ft / 375.00 ft x 40.15 ft x 31.00 ft (normal load)
114.30 m / 114.30 m x 12.24 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

Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 11,013 shp / 8,215 Kw = 18.65 kts
Range 37,500nm at 14.00 kts
Bunker at max displacement = 6,097 tons

Complement:
422 - 549

Cost:
£1.071 million / $4.285 million

Distribution of weights at normal displacement:
Armament: 5 tons, 0.1%
Machinery: 309 tons, 3.9%
Hull, fittings & equipment: 2,652 tons, 33.2%
Fuel, ammunition & stores: 3,552 tons, 44.4%
Miscellaneous weights: 1,482 tons, 18.5%

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,160 lbs / 4,155 Kg = 259.3 x 4.1 " / 105 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.04
Metacentric height 1.4 ft / 0.4 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: 0.600
Length to Beam Ratio: 9.34 : 1
'Natural speed' for length: 19.36 kts
Power going to wave formation at top speed: 44 %
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): 44.6%
- Above water (accommodation/working, high = better): 0.0%
Waterplane Area: 11,011 Square feet or 1,023 Square metres
Displacement factor (Displacement / loading): 374%
Structure weight / hull surface area: 149 lbs/sq ft or 729 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.50
- Longitudinal: 1.93
- Overall: 2.05
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

1335 tons - ballast
42 tons - 24 torpedoes
75 tons - 3 planes
25 tons - 1 catapult + crane
5 tons - Sonar

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

MTB-1 (base design used => Soviet TYP G 5)

Displacement: 12 tons
Length: 19m
Beam: 3.3m
Draft: 1.2m
Engines: two gasoline engines, 1700hp
Speed: 48 knots
Armament: two 21" torpedoes, two 13.2mm MG and two 7.7mm MG
Crew: 8


MTB-2 (base design used => Soviet TYP ¦ 4)

Displacement: 9 tons
Length: 16.5m
Beam: 3.3m
Draft: 0.9m
Engines: two gasoline engines, 1300hp
Speed: 49 knots
Armament: two 17.7" torpedoes and two 13.2mm MG
Crew: 7


MTB-3 (base design used => Italian MAS 501)

Displacement: 22 tons
Length: 17m
Beam: 4.2m
Draft: 1.2m
Engines: two gasoline engines, 2000hp
Speed: 41 knots
Armament: two 17.7" torpedoes, one 25mm gun and two 13.2mm MG
Crew: 12


Could be wrong about the boats I roughly based the MTBs on (I forgot to write it down). Also data is from http://www.warshipsww2.eu/staty.php?language=E
and Gavin mentioned something about dodgy stats on that site (at least the old site) so I'm not 100% certain that data is any good...

Looks at Yamato, cowering slightly, then realising it is too far away to cause Nordmark any problems.

I am not sure Yamato is the correct name for that ship. What is 'Porcupine' in Japanese?

Yamato, but spelled using different Kanji.

Actually it is 'Harinezumi' (according to my Freelang dictionary). Sounds more like a name I would use for a plane.

I have concerns over the simming of that large submarine. Over half the weight is made up of fuel. 6000tons of diesel needs a volume of about 7500m^3 which is about 80x10x5, or the vast majority of the internal volume of this vessel.

I'm not sure the huge variety of submarines helps either.

37,500nm at 14.00 kts is the range given for the Sen Toku submarines. It was not I who created those submarines but the OTL Imperial Japanese Navy.

Quoted

Originally posted by Rooijen10
37,500nm at 14.00 kts is the range given for the Sen Toku submarines. It was not I who created those submarines but the OTL Imperial Japanese Navy.

Given or not, that is one hell of a long range!!!!

I have to ask, could it be a type of the part of your source??

Quoted

I have to ask, could it be a type of the part of your source??

Got it from two sources, one of them Wikipedia, which states:

Quoted

The I-400 was originally designed so that it could travel round-trip to anywhere in the world

and

Quoted

Each submarine had four 3,000 horsepower (2.2 MW) engines and fuel enough to go around the world one-and-a-half times, more than enough to reach the United States from either direction.

Far as Yamato goes, I know where I'd aim the torpedoes

Quoted

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.9" / 429 mm 520.00 ft / 158.50 m 16.50 ft / 5.03 m
Ends: 14.0" / 356 mm 120.00 ft / 36.58 m 8.00 ft / 2.44 m
300.00 ft / 91.44 m Unarmoured ends
Upper: 2.00" / 51 mm 520.00 ft / 158.50 m 25.00 ft / 7.62 m
Main Belt covers 85% of normal length

- Torpedo Bulkhead and Bulges:
3.00" / 76 mm 520.00 ft / 158.50 m 50.00 ft / 15.24 m