GB/CB/1921 48,000 tons, Great Britain Battlecruiser laid down 1921 (Engine 1937)
Displacement:
43,640 t light; 45,621 t standard; 49,250 t normal; 52,153 t full load
Dimensions: Length overall / water x beam x draught
856.57 ft / 855.00 ft x 105.00 ft x 33.30 ft (normal load)
261.08 m / 260.60 m x 32.00 m x 10.15 m
Armament:
9 - 16.00" / 406 mm guns (3x3 guns), 2,048.00lbs / 928.96kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
20 - 5.00" / 127 mm guns (10x2 guns), 62.00lbs / 28.12kg shells, 1921 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships, 4 raised mounts - superfiring
Weight of broadside 19,672 lbs / 8,923 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 14.0" / 356 mm 555.00 ft / 169.16 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 555.00 ft / 169.16 m 29.00 ft / 8.84 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 14.0" / 356 mm 9.00" / 229 mm 14.0" / 356 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Armour deck: 5.00" / 127 mm, Conning tower: 12.00" / 305 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 161,252 shp / 120,294 Kw = 30.00 kts
Range 7,500nm at 18.00 kts
Bunker at max displacement = 6,532 tons
Complement:
1,652 - 2,148
Cost:
£10.741 million / $42.964 million
Distribution of weights at normal displacement:
Armament: 2,460 tons, 5.0 %
Armour: 17,357 tons, 35.2 %
- Belts: 5,627 tons, 11.4 %
- Torpedo bulkhead: 1,191 tons, 2.4 %
- Armament: 4,250 tons, 8.6 %
- Armour Deck: 5,942 tons, 12.1 %
- Conning Tower: 347 tons, 0.7 %
Machinery: 4,469 tons, 9.1 %
Hull, fittings & equipment: 19,353 tons, 39.3 %
Fuel, ammunition & stores: 5,610 tons, 11.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
71,719 lbs / 32,531 Kg = 35.0 x 16.0 " / 406 mm shells or 10.6 torpedoes
Stability (Unstable if below 1.00): 1.08
Metacentric height 6.2 ft / 1.9 m
Roll period: 17.7 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.78
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.577
Length to Beam Ratio: 8.14 : 1
'Natural speed' for length: 29.24 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.48 ft / 7.46 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.1 %
- Above water (accommodation/working, high = better): 177.8 %
Waterplane Area: 64,237 Square feet or 5,968 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 210 lbs/sq ft or 1,026 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.20
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
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Wednesday, June 22, 2005
A rework of my "48,000 ton battlecruiser" design
Well, this is only nominally a 48,000 ton ship, as my Springsharp design came out heavier, due to structural strength needs. The design is for a ship of 855ft x 105ft x 33.3ft with a speed of 30 knots. The armament is 9-16in/45 BLR and 20-5in QF guns. The armor basis is 14inches. This is the Springsharp report:
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