US/CB/1941 large, United States Battlecruiser laid down 1941 (Engine 1945)
Displacement:
120,647 t light; 125,724 t standard; 132,804 t normal; 138,467 t full load
Dimensions: Length overall / water x beam x draught
1,253.40 ft / 1,250.00 ft x 150.00 ft x 37.00 ft (normal load)
382.04 m / 381.00 m x 45.72 m x 11.28 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1941 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, all raised mounts - superfiring
24 - 5.10" / 130 mm guns (12x2 guns), 66.33lbs / 30.08kg shells, 1941 Model
Breech loading guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
Weight of broadside 43,266 lbs / 19,625 kg
Shells per gun, main battery: 100
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 15.0" / 381 mm 815.00 ft / 248.41 m 18.00 ft / 5.49 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 815.00 ft / 248.41 m 32.00 ft / 9.75 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 9.00" / 229 mm 15.0" / 381 mm
2nd: 2.00" / 51 mm - -
- Armour deck: 8.00" / 203 mm, Conning tower: 15.00" / 381 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 8 shafts, 501,490 shp / 374,112 Kw = 35.00 kts
Range 12,000nm at 15.00 kts
Bunker at max displacement = 12,744 tons
Complement:
3,477 - 4,521
Cost:
£65.147 million / $260.589 million
Distribution of weights at normal displacement:
Armament: 5,408 tons, 4.1 %
Armour: 43,148 tons, 32.5 %
- Belts: 9,382 tons, 7.1 %
- Torpedo bulkhead: 3,860 tons, 2.9 %
- Armament: 7,415 tons, 5.6 %
- Armour Deck: 21,650 tons, 16.3 %
- Conning Tower: 841 tons, 0.6 %
Machinery: 12,664 tons, 9.5 %
Hull, fittings & equipment: 59,426 tons, 44.7 %
Fuel, ammunition & stores: 12,157 tons, 9.2 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
231,870 lbs / 105,175 Kg = 50.1 x 21.0 " / 533 mm shells or 44.1 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 12.3 ft / 3.8 m
Roll period: 17.9 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.60
Seaboat quality (Average = 1.00): 1.18
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.670
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 35.36 kts
Power going to wave formation at top speed: 48 %
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: 40.00 ft / 12.19 m
- Forecastle (20 %): 32.00 ft / 9.75 m
- Mid (50 %): 32.00 ft / 9.75 m
- Quarterdeck (15 %): 32.00 ft / 9.75 m
- Stern: 32.00 ft / 9.75 m
- Average freeboard: 32.64 ft / 9.95 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 71.8 %
- Above water (accommodation/working, high = better): 256.4 %
Waterplane Area: 146,281 Square feet or 13,590 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 308 lbs/sq ft or 1,504 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.11
- Longitudinal: 0.97
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
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.
Sunday, April 03, 2005
A very large battlecruiser: US/CB/1941 large
I was looking at my pencil drawing for a very large American battleship that I had drawn in 2001. I have sketched out similar battlecruisers in the latter 1990's, as well. This is my Springsharp report for such a battlecruiser. It shows just how much can be done, if you are willing to "go large":
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