I-300, Japan Submarine laid down 1940
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,
Geared drive, 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:
59 - 76
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)
Increased Battery Capacity: 286 tons (used bunker)
(*) read: Limit of a crew member's life insurance.