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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