Jap/CL/1933, Japan Light Cruiser laid down 1933 (Engine 1945)
Displacement:
14,141 t light; 14,672 t standard; 16,251 t normal; 17,514 t full load
Dimensions: Length overall / water x beam x draught
672.08 ft / 669.00 ft x 65.00 ft x 30.00 ft (normal load)
204.85 m / 203.91 m x 19.81 m x 9.14 m
Armament:
9 - 6.30" / 160 mm guns (3x3 guns), 124.98lbs / 56.69kg shells, 1933 Model
Quick firing guns in turrets (on barbettes)
on centreline ends, majority forward, all raised mounts - superfiring
12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1933 Model
Dual purpose guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
36 - 0.98" / 25.0 mm guns (12x3 guns), 0.48lbs / 0.22kg shells, 1933 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 1,892 lbs / 858 kg
Shells per gun, main battery: 180
8 - 24.0" / 609.6 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 510.00 ft / 155.45 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 117 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 510.00 ft / 155.45 m 21.00 ft / 6.40 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 5.00" / 127 mm 3.00" / 76 mm 3.00" / 76 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
- Armour deck: 3.00" / 76 mm, Conning tower: 5.00" / 127 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 189,502 shp / 141,369 Kw = 37.00 kts
Range 12,000nm at 14.00 kts
Bunker at max displacement = 2,842 tons
Complement:
719 - 935
Cost:
£6.446 million / $25.784 million
Distribution of weights at normal displacement:
Armament: 236 tons, 1.5 %
Armour: 3,080 tons, 19.0 %
- Belts: 742 tons, 4.6 %
- Torpedo bulkhead: 396 tons, 2.4 %
- Armament: 350 tons, 2.2 %
- Armour Deck: 1,522 tons, 9.4 %
- Conning Tower: 69 tons, 0.4 %
Machinery: 4,785 tons, 29.4 %
Hull, fittings & equipment: 6,039 tons, 37.2 %
Fuel, ammunition & stores: 2,110 tons, 13.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
15,394 lbs / 6,983 Kg = 123.2 x 6.3 " / 160 mm shells or 2.0 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 3.3 ft / 1.0 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.45
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.436
Length to Beam Ratio: 10.29 : 1
'Natural speed' for length: 25.87 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 54
Bow angle (Positive = bow angles forward): 2.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (20 %): 22.00 ft / 6.71 m
- Mid (50 %): 22.00 ft / 6.71 m
- Quarterdeck (15 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 22.72 ft / 6.93 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 155.1 %
- Above water (accommodation/working, high = better): 133.4 %
Waterplane Area: 27,431 Square feet or 2,548 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 120 lbs/sq ft or 588 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.73
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
Sunday, January 30, 2005
Another shot at the Jap/CL/1933 design
I thought I would try the new trick (moving the date forward for machinery) for the 1933 Japanese light cruiser. It is very "edgy" with 9-16cm guns (6.3in) and 37 knots with a 12,000nm range. I still had to give it an unnaturally deep draft, to get sufficient hull strength and seakeeping ability.
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