GB/CB/1905 design study C1, Great Britain Battlecruiser laid down 1905
Displacement:
29,611 t light; 30,692 t standard; 35,293 t normal; 38,973 t full load
Dimensions: Length overall / water x beam x draught
770.00 ft / 770.00 ft x 85.00 ft x 27.00 ft (normal load)
234.70 m / 234.70 m x 25.91 m x 8.23 m
Armament:
8 - 12.00" / 305 mm guns (3 mounts), 864.00lbs / 391.90kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, all raised mounts - superfiring
Main guns limited to end-on fire
12 - 6.00" / 152 mm guns (9 mounts), 108.00lbs / 48.99kg shells, 1905 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 8,208 lbs / 3,723 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 500.00 ft / 152.40 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 100 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.50" / 38 mm 500.00 ft / 152.40 m 23.00 ft / 7.01 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 4.00" / 102 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm - -
- Armour deck: 2.50" / 64 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 107,644 shp / 80,303 Kw = 28.00 kts
Range 7,500nm at 15.00 kts
Bunker at max displacement = 8,282 tons
Complement:
1,286 - 1,673
Cost:
£3.040 million / $12.160 million
Distribution of weights at normal displacement:
Armament: 1,026 tons, 2.9 %
Armour: 7,132 tons, 20.2 %
- Belts: 2,032 tons, 5.8 %
- Torpedo bulkhead: 638 tons, 1.8 %
- Armament: 2,038 tons, 5.8 %
- Armour Deck: 2,424 tons, 6.9 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 8,155 tons, 23.1 %
Hull, fittings & equipment: 13,299 tons, 37.7 %
Fuel, ammunition & stores: 5,681 tons, 16.1 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
44,112 lbs / 20,009 Kg = 51.1 x 12.0 " / 305 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 4.8 ft / 1.5 m
Roll period: 16.3 seconds
Steadiness - As gun platform (Average = 50 %): 86 %
- Recoil effect (Restricted arc if above 1.00): 1.16
Seaboat quality (Average = 1.00): 1.72
Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.699
Length to Beam Ratio: 9.06 : 1
'Natural speed' for length: 27.75 kts
Power going to wave formation at top speed: 49 %
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: 37.00 ft / 11.28 m
- Forecastle (20 %): 34.00 ft / 10.36 m (33.00 ft / 10.06 m aft of break)
- Mid (73 %): 32.00 ft / 9.75 m (22.00 ft / 6.71 m aft of break)
- Quarterdeck (15 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 30.21 ft / 9.21 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 126.6 %
- Above water (accommodation/working, high = better): 237.3 %
Waterplane Area: 52,413 Square feet or 4,869 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 163 lbs/sq ft or 794 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.42
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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.
Saturday, January 15, 2005
Frank Fox had argued for a armament of 8-12in guns
I just tried out an 8-12in gunned GB/CB/1905 with a 6in belt. The best speed I could get was 28 knots. The size is 35,293, normal displacement. By adjusting dimensions, I could probably do better. Hull strength is the issue. I am sure that my friend Cliff would really enjoy trying out Springsharp.
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