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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