GB/CB/1921 Very Fast, Great Britain Battlecruiser laid down 1921 (Engine 1937)
Displacement:
28,134 t light; 29,198 t standard; 30,800 t normal; 32,082 t full load
Dimensions: Length overall / water x beam x draught
814.38 ft / 812.00 ft x 90.00 ft x 28.00 ft (normal load)
248.22 m / 247.50 m x 27.43 m x 8.53 m
Armament:
9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 5.50" / 140 mm guns (6x2 guns), 83.19lbs / 37.73kg shells, 1921 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships, 2 raised mounts - superfiring
Weight of broadside 8,774 lbs / 3,980 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 7.00" / 178 mm 460.00 ft / 140.21 m 8.00 ft / 2.44 m
Ends: Unarmoured
Upper: 4.00" / 102 mm 460.00 ft / 140.21 m 8.00 ft / 2.44 m
Main Belt covers 87 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
2.00" / 51 mm 460.00 ft / 140.21 m 28.00 ft / 8.53 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.00" / 229 mm 6.00" / 152 mm 9.00" / 229 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 219,416 shp / 163,684 Kw = 35.00 kts
Range 6,400nm at 15.00 kts
Bunker at max displacement = 2,883 tons
Complement:
1,162 - 1,511
Cost:
£7.019 million / $28.075 million
Distribution of weights at normal displacement:
Armament: 1,097 tons, 3.6 %
Armour: 7,836 tons, 25.4 %
- Belts: 1,743 tons, 5.7 %
- Torpedo bulkhead: 953 tons, 3.1 %
- Armament: 2,179 tons, 7.1 %
- Armour Deck: 2,770 tons, 9.0 %
- Conning Tower: 191 tons, 0.6 %
Machinery: 6,081 tons, 19.7 %
Hull, fittings & equipment: 13,120 tons, 42.6 %
Fuel, ammunition & stores: 2,666 tons, 8.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
39,189 lbs / 17,776 Kg = 45.4 x 12.0 " / 305 mm shells or 4.9 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 5.2 ft / 1.6 m
Roll period: 16.5 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.63
Seaboat quality (Average = 1.00): 1.05
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.527
Length to Beam Ratio: 9.02 : 1
'Natural speed' for length: 28.50 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 34.00 ft / 10.36 m
- Forecastle (20 %): 28.00 ft / 8.53 m
- Mid (67 %): 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: 25.84 ft / 7.88 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 116.9 %
- Above water (accommodation/working, high = better): 210.9 %
Waterplane Area: 49,909 Square feet or 4,637 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 174 lbs/sq ft or 849 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.23
- Overall: 1.00
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.
Tuesday, November 07, 2006
Very fast is relative: the GB/CB/1921 Very Fast with 9-12in guns
This is not as fast as my last attempt at a fast battlecruiser. This version is "just 35 knots". The main features are that the armament is just 9-12in guns and the displacement is much less. The Standard displacement is only 29,198 tons. The secondary armament is 12-5.5in QF guns. The belt is 7in with a 3in deck. This is the Springsharp report:
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