US/CL/1940 AA, United States Light Cruiser laid down 1940 (Engine 1950) Displacement: 7,687 t light; 7,951 t standard; 8,625 t normal; 9,165 t full load Dimensions: Length (overall / waterline) x beam x draught (normal/deep) (546.43 ft / 540.00 ft) x 54.00 ft x (20.50 / 21.43 ft) (166.55 m / 164.59 m) x 16.46 m x (6.25 / 6.53 m) Armament: 12 - 5.00" / 127 mm 38.0 cal guns - 58.00lbs / 26.31kg shells, 150 per gun Dual purpose guns in turret on barbette mounts, 1940 Model 4 x Twin mounts on centreline ends, evenly spread 2 raised mounts - superfiring 4 x Twin mounts on centreline ends, evenly spread 4 double raised mounts 4 - 5.00" / 127 mm 38.0 cal guns - 58.00lbs / 26.31kg shells, 150 per gun Dual purpose guns in turret on barbette mounts, 1940 Model 2 x Twin mounts on sides, forward deck aft 12 - 1.57" / 40.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun Breech loading guns in deck mounts, 1940 Model 2 x Quad mounts on sides, aft deck forward 2 raised mounts - superfiring 1 x Quad mount on centreline, aft deck aft Weight of broadside 952 lbs / 432 kg 8 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.501 t each, 12.009 t total In 2 sets of deck mounted side rotating tubes Armour: - Belts: Width (max) Length (avg) Height (avg) Main: 4.00" / 102 mm 355.00 ft / 108.20 m 12.00 ft / 3.66 m Ends: Unarmoured Main Belt covers 101 % of normal length Main belt does not fully cover magazines and engineering spaces - Torpedo Bulkhead: 0.60" / 15 mm 355.00 ft / 108.20 m 20.50 ft / 6.25 m - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) Main: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm 2nd: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm - Armoured deck - single deck: 2.00" / 51 mm For and Aft decks Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm - Conning towers: Forward 5.00" / 127 mm, Aft 0.00" / 0 mm Machinery: Oil fired boilers, steam turbines, Geared drive, 4 shafts, 88,421 shp / 65,962 Kw = 34.00 kts Range 5,400nm at 16.00 kts Bunker at max displacement = 1,214 tons Complement: 446 - 581 Cost: £3.858 million / $15.432 million Distribution of weights at normal displacement: Armament: 214 tons, 2.5 % - Guns: 202 tons, 2.3 % - Torpedoes: 12 tons, 0.1 % Armour: 1,952 tons, 22.6 % - Belts: 700 tons, 8.1 % - Torpedo bulkhead: 162 tons, 1.9 % - Armament: 288 tons, 3.3 % - Armour Deck: 757 tons, 8.8 % - Conning Tower: 45 tons, 0.5 % Machinery: 2,115 tons, 24.5 % Hull, fittings & equipment: 3,406 tons, 39.5 % Fuel, ammunition & stores: 938 tons, 10.9 % Miscellaneous weights: 0 tons, 0.0 % Overall survivability and seakeeping ability: Survivability (Non-critical penetrating hits needed to sink ship): 11,828 lbs / 5,365 Kg = 189.2 x 5.0 " / 127 mm shells or 1.9 torpedoes Stability (Unstable if below 1.00): 1.02 Metacentric height 2.1 ft / 0.6 m Roll period: 15.7 seconds Steadiness - As gun platform (Average = 50 %): 51 % - Recoil effect (Restricted arc if above 1.00): 0.56 Seaboat quality (Average = 1.00): 1.03 Hull form characteristics: Hull has a flush deck, an extended bulbous bow and large transom stern Block coefficient (normal/deep): 0.505 / 0.513 Length to Beam Ratio: 10.00 : 1 'Natural speed' for length: 26.50 kts Power going to wave formation at top speed: 62 % Trim (Max stability = 0, Max steadiness = 100): 49 Bow angle (Positive = bow angles forward): 9.00 degrees Stern overhang: 2.00 ft / 0.61 m Freeboard (% = length of deck as a percentage of waterline length): Fore end, Aft end - Forecastle: 20.00 %, 28.00 ft / 8.53 m, 24.00 ft / 7.32 m - Forward deck: 30.00 %, 24.00 ft / 7.32 m, 21.00 ft / 6.40 m - Aft deck: 35.00 %, 21.00 ft / 6.40 m, 18.00 ft / 5.49 m - Quarter deck: 15.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m - Average freeboard: 21.40 ft / 6.52 m Ship space, strength and comments: Space - Hull below water (magazines/engines, low = better): 140.9 % - Above water (accommodation/working, high = better): 176.3 % Waterplane Area: 20,299 Square feet or 1,886 Square metres Displacement factor (Displacement / loading): 125 % Structure weight / hull surface area: 97 lbs/sq ft or 473 Kg/sq metre Hull strength (Relative): - Cross-sectional: 0.93 - Longitudinal: 2.02 - Overall: 1.01 Hull space for machinery, storage, compartmentation is cramped Room for accommodation and workspaces is excellent
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Thursday, March 06, 2008
An Atlanta-style light cruiser
I wanted to see what an Atlanta-style fast light cruiser would be like. I call my design the "US/CL/1940 AA". My ship has 16-5in/38 DP guns and has a 34 knot speed:
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