Ger/CA/1915, Germany Armoured Cruiser laid down 1915 (Engine 1927) Displacement: 21,233 t light; 22,005 t standard; 23,500 t normal; 24,696 t full load Dimensions: Length overall / water x beam x draught 726.08 ft / 725.00 ft x 80.00 ft x 25.00 ft (normal load) 221.31 m / 220.98 m x 24.38 m x 7.62 m Armament: 8 - 9.40" / 239 mm guns (4x2 guns), 419.00lbs / 190.06kg shells, 1915 Model Breech loading guns in turrets (on barbettes) on centreline ends, evenly spread, 2 raised mounts - superfiring 10 - 6.00" / 152 mm guns in single mounts, 101.00lbs / 45.81kg shells, 1915 Model Quick firing guns in deck mounts with hoists on side ends, evenly spread, 2 raised mounts - superfiring Weight of broadside 4,362 lbs / 1,979 kg Shells per gun, main battery: 120 Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 6.00" / 152 mm 555.00 ft / 169.16 m 17.00 ft / 5.18 m Ends: Unarmoured Main Belt covers 118 % of normal length - Torpedo Bulkhead: 1.00" / 25 mm 555.00 ft / 169.16 m 22.00 ft / 6.71 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 8.00" / 203 mm 4.00" / 102 mm 6.00" / 152 mm 2nd: 2.00" / 51 mm - - - Armour deck: 4.00" / 102 mm, Conning tower: 6.00" / 152 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 156,174 shp / 116,506 Kw = 33.00 kts Range 6,500nm at 15.00 kts Bunker at max displacement = 2,691 tons Complement: 948 - 1,233 Cost: £2.757 million / $11.029 million Distribution of weights at normal displacement: Armament: 550 tons, 2.3 % Armour: 6,910 tons, 29.4 % - Belts: 2,322 tons, 9.9 % - Torpedo bulkhead: 452 tons, 1.9 % - Armament: 985 tons, 4.2 % - Armour Deck: 3,044 tons, 13.0 % - Conning Tower: 106 tons, 0.5 % Machinery: 4,930 tons, 21.0 % Hull, fittings & equipment: 8,843 tons, 37.6 % Fuel, ammunition & stores: 2,267 tons, 9.6 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 34,067 lbs / 15,453 Kg = 82.0 x 9.4 " / 239 mm shells or 4.1 torpedoes Stability (Unstable if below 1.00): 1.17 Metacentric height 4.8 ft / 1.5 m Roll period: 15.4 seconds Steadiness - As gun platform (Average = 50 %): 59 % - Recoil effect (Restricted arc if above 1.00): 0.52 Seaboat quality (Average = 1.00): 1.19 Hull form characteristics: Hull has raised forecastle, rise forward of midbreak Block coefficient: 0.567 Length to Beam Ratio: 9.06 : 1 'Natural speed' for length: 26.93 kts Power going to wave formation at top speed: 56 % Trim (Max stability = 0, Max steadiness = 100): 50 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 %): 29.00 ft / 8.84 m (28.00 ft / 8.53 m aft of break) - Mid (73 %): 28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break) - Quarterdeck (15 %): 20.00 ft / 6.10 m - Stern: 20.00 ft / 6.10 m - Average freeboard: 26.20 ft / 7.99 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 115.2 % - Above water (accommodation/working, high = better): 219.2 % Waterplane Area: 41,138 Square feet or 3,822 Square metres Displacement factor (Displacement / loading): 111 % Structure weight / hull surface area: 139 lbs/sq ft or 677 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.96 - Longitudinal: 1.34 - Overall: 1.00 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Thursday, June 30, 2005
This is about 50%, or so, larger than planned: Ger/CA/1915
The Ger/CA/1915 (or whatever the year was) fast armoured cruiser was originally planned to be just 14,000 tons (!). That was over optimistic by a good bit. The only way that the other might just possibly have worked would have been to have very high power output machinery. The basic idea was to have a 6in armour basis with 8-9.4in guns (25 ton) with a 419lb APC shot. The secondary armament was 106in guns (5.5 ton) with a 101 lb. shot. The armour deck was thick, being 4inches. I had actually wanted a lower splinter deck of 3in. which I omitted here, as it seemed too extreme, even for me. This is the Springsharp report:
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