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
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
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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