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301

Sunday, February 11th 2018, 1:39am

Nisshin Maru, Japan Research Vessel laid down 1944, converted in 1948

Displacement:
6,480 t light; 6,633 t standard; 7,661 t normal; 8,483 t full load

Dimensions: Length overall / water x beam x draught
392.23 ft / 380.00 ft x 70.00 ft x 16.80 ft (normal load)
119.55 m / 115.82 m x 21.34 m x 5.12 m

Machinery:
Diesel Internal combustion motors,
No drive to shaft, 2 shafts, 14,893 shp / 11,110 Kw = 20.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 1,850 tons

Complement:
409 - 532

Cost:
£1.884 million / $7.536 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 380 tons, 5.0 %
Hull, fittings & equipment: 2,100 tons, 27.4 %
Fuel, ammunition & stores: 1,181 tons, 15.4 %
Miscellaneous weights: 4,000 tons, 52.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
12,380 lbs / 5,616 Kg = 114.6 x 6 " / 152 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 3.3 ft / 1.0 m
Roll period: 16.2 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 1.62

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.600
Length to Beam Ratio: 5.43 : 1
'Natural speed' for length: 19.49 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 5.00 ft / 1.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.00 ft / 8.23 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.72 ft / 5.71 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 73.5 %
- Above water (accommodation/working, high = better): 163.1 %
Waterplane Area: 19,455 Square feet or 1,807 Square metres
Displacement factor (Displacement / loading): 161 %
Structure weight / hull surface area: 78 lbs/sq ft or 380 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 2.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Miscellaneous weights breakdown (4000 tons)
Not sorted out yet.

302

Sunday, February 11th 2018, 1:42am

I-350

Date: 1948
Type: Coastal
Length: 40.0m
Beam: 4.5m
Draft: 4.5m
Crush depth: 225.0m
Light Displacement 335t
Loaded Displacement 363t
Full Displacement 405t
wt fuel&batts: 60t
Reserve buoyancy: 10%

Armament:
- 2 x 21" (bow)
ElecHP: 1650hp
DieselHP: 225hp
Speed:
- Max Surf Speed: 8.2 knots
- Max Sub Speed: 16.2 knots
Range:
- Surfaced: 3,781nm@8 knots
- Submerged: 122nm@5 knots
Tons Oil: 20.0t
Tons Battery: 40.0t
Miscellaneous Weight: 50 tons

Crew: 18

- 6 Type 3 torpedoes (= 2 in the tubes + 4 from the 8 tons for 'mines or reload torpedoes').
- Diesel-electric drive.
- Main electric engine output: 1,550 shp.
- Silent running engine output: 100 shp.
- Surface speed: (diesel-electric) 16.1 knots.
- Submerged speed: (silent running engines) 6.3 knots, (battery-electric) 15.8 knots, (diesel-electric + Ninjatousaya) 10 knots.
- Range Surfaced (diesel): 3,781nm@8 knots.
- Range Submerged (batteries, silent running engine): 862nm@2 knots, 375nm@3 knots, 122nm@5 knots.
- Range Submerged (batteries, main engine): 35nm@8 knots, 17nm@10 knots, 3nm@15 knots.
- Endurance: (surfaced, diesel) 19 days and 16 hours @ 8 knots, (submerged, electric) 1 day @ 5 knots.
- Diving depth: 295 feet
- Emergency Depth: 472 feet
- Crush Depth: 738 feet
- 50 tons Miscellaneous weights breakdown:
--- 10 tons for Ninjatousaya System.
--- 20 tons for sonar and hydrophones.
--- 10 tons for air condition system.
--- 1 tons for 20 oxygen bottles (50 l, 150 atm).
--- 5 tons CO2 removal system + Soda lime.
--- 4 tons for desalinization gear.