Tsugaru, Japan Minelayer laid down 1942
Displacement:
3,658 t light; 3,791 t standard; 4,434 t normal; 4,949 t full load
Dimensions: Length overall / water x beam x draught
391.97 ft / 385.00 ft x 51.00 ft x 18.00 ft (normal load)
119.47 m / 117.35 m x 15.54 m x 5.49 m
Armament:
4 - 5.00" / 127 mm guns (2x2 guns), 55.12lbs / 25.00kg shells, 1942 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread
16 - 0.52" / 13.2 mm guns (4x4 guns), 0.09lbs / 0.04kg shells, 1942 Model
Machine guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 222 lbs / 101 kg
Shells per gun, main battery: 350
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 29,860 shp / 22,275 Kw = 28.00 kts
Range 10,000nm at 15.00 kts
Bunker at max displacement = 1,158 tons
Complement:
271 - 353
Cost:
£1.678 million / $6.710 million
Distribution of weights at normal displacement:
Armament: 31 tons, 0.7%
Armour: 19 tons, 0.4%
- Belts: 0 tons, 0.0%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 19 tons, 0.4%
- Armour Deck: 0 tons, 0.0%
- Conning Tower: 0 tons, 0.0%
Machinery: 780 tons, 17.6%
Hull, fittings & equipment: 1,578 tons, 35.6%
Fuel, ammunition & stores: 776 tons, 17.5%
Miscellaneous weights: 1,250 tons, 28.2%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,012 lbs / 2,727 Kg = 96.2 x 5.0 " / 127 mm shells or 1.2 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 2.0 ft / 0.6 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.11
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.439
Length to Beam Ratio: 7.55 : 1
'Natural speed' for length: 23.13 kts
Power going to wave formation at top speed: 62 %
Trim (Max stability = 0, Max steadiness = 100): 41
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 26.00 ft / 7.92 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: 18.64 ft / 5.68 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 94.1%
- Above water (accommodation/working, high = better): 163.1%
Waterplane Area: 12,894 Square feet or 1,198 Square metres
Displacement factor (Displacement / loading): 144%
Structure weight / hull surface area: 72 lbs/sq ft or 352 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.95
- 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
700 tons for mines and rails.
25 tons for seaplane.
25 tons for crane and catapult.
100 tons for electronics.
400 tons for various stuff.