Jap/CA/9127b1, Japan Heavy Cruiser laid down 1927
Displacement:
17,158 t light; 17,937 t standard; 19,511 t normal; 20,770 t full load
Dimensions: Length overall / water x beam x draught
724.08 ft / 721.00 ft x 71.00 ft x 29.00 ft (normal load)
220.70 m / 219.76 m x 21.64 m x 8.84 m
Armament:
9 - 9.40" / 239 mm guns (3 mounts), 415.29lbs / 188.37kg shells, 1927 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 8 raised guns - superfiring
12 - 5.00" / 127 mm guns (6x2 guns), 62.50lbs / 28.35kg shells, 1927 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
33 - 0.98" / 25.0 mm guns (11x3 guns), 0.48lbs / 0.22kg shells, 1927 Model
Anti-aircraft guns in deck mounts
on side ends, majority forward, all raised mounts - superfiring
Weight of broadside 4,503 lbs / 2,043 kg
Shells per gun, main battery: 150
12 - 24.0" / 609.6 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 520.00 ft / 158.50 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 111 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 520.00 ft / 158.50 m 24.00 ft / 7.32 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 - -
- Armour deck: 3.00" / 76 mm, Conning tower: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 165,668 shp / 123,588 Kw = 35.00 kts
Range 9,000nm at 14.00 kts
Bunker at max displacement = 2,833 tons
Complement:
825 - 1,073
Cost:
£6.565 million / $26.262 million
Distribution of weights at normal displacement:
Armament: 563 tons, 2.9 %
Armour: 3,619 tons, 18.5 %
- Belts: 765 tons, 3.9 %
- Torpedo bulkhead: 462 tons, 2.4 %
- Armament: 503 tons, 2.6 %
- Armour Deck: 1,827 tons, 9.4 %
- Conning Tower: 62 tons, 0.3 %
Machinery: 5,229 tons, 26.8 %
Hull, fittings & equipment: 7,747 tons, 39.7 %
Fuel, ammunition & stores: 2,353 tons, 12.1 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,302 lbs / 7,848 Kg = 41.7 x 9.4 " / 239 mm shells or 2.2 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 3.7 ft / 1.1 m
Roll period: 15.5 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.72
Seaboat quality (Average = 1.00): 1.02
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.460
Length to Beam Ratio: 10.15 : 1
'Natural speed' for length: 26.85 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 53
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 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 21.80 ft / 6.64 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 152.3 %
- Above water (accommodation/working, high = better): 126.0 %
Waterplane Area: 32,926 Square feet or 3,059 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 141 lbs/sq ft or 686 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.33
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
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Friday, January 28, 2005
Another run at a Japanese Heavy Cruiser: Jap/CA/1921b1
I have another, rather unsatisfactory, Japanese heavy cruiser design: Jap/CA/1927b1. I like the 9.4in gun and wanted at least a 35 knot speed. What I got was another ship that was too large (I'm working in an environment where I have blown off the Washington Naval Treat limitations):
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