GB/CA/1912 alt1, Great Britain Armored Cruiser laid down 1912 (Engine 1927)
Displacement:
16,768 t light; 17,693 t standard; 19,389 t normal; 20,745 t full load
Dimensions: Length overall / water x beam x draught
651.05 ft / 650.00 ft x 75.00 ft x 24.00 ft (normal load)
198.44 m / 198.12 m x 22.86 m x 7.32 m
Armament:
12 - 9.20" / 234 mm guns (6x2 guns), 389.34lbs / 176.60kg shells, 1912 Model
Breech loading guns in turrets (on barbettes)
on centreline, evenly spread, all raised mounts
14 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
Quick firing guns in casemate mounts
on side, all amidships
14 guns in hull casemates - Limited use in heavy seas
Weight of broadside 6,184 lbs / 2,805 kg
Shells per gun, main battery: 150
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 360.00 ft / 109.73 m 16.00 ft / 4.88 m
Ends: 3.00" / 76 mm 290.00 ft / 88.39 m 16.00 ft / 4.88 m
Main Belt covers 85 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.00" / 152 mm 4.00" / 102 mm 6.00" / 152 mm
2nd: 3.00" / 76 mm - -
- Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 99,809 shp / 74,458 Kw = 30.00 kts
Range 8,500nm at 15.00 kts
Bunker at max displacement = 3,053 tons
Complement:
821 - 1,068
Cost:
£1.677 million / $6.709 million
Distribution of weights at normal displacement:
Armament: 773 tons, 4.0 %
Armour: 4,949 tons, 25.5 %
- Belts: 2,021 tons, 10.4 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 1,541 tons, 7.9 %
- Armour Deck: 1,295 tons, 6.7 %
- Conning Tower: 93 tons, 0.5 %
Machinery: 3,151 tons, 16.2 %
Hull, fittings & equipment: 7,895 tons, 40.7 %
Fuel, ammunition & stores: 2,620 tons, 13.5 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
26,249 lbs / 11,906 Kg = 67.4 x 9.2 " / 234 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.05
Metacentric height 3.5 ft / 1.1 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.94
Seaboat quality (Average = 1.00): 1.09
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.580
Length to Beam Ratio: 8.67 : 1
'Natural speed' for length: 25.50 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 2.00 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 %): 26.00 ft / 7.92 m
- Mid (67 %): 26.00 ft / 7.92 m (18.00 ft / 5.49 m aft of break)
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 23.68 ft / 7.22 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.1 %
- Above water (accommodation/working, high = better): 193.1 %
Waterplane Area: 34,993 Square feet or 3,251 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 147 lbs/sq ft or 716 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.38
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
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.
Monday, May 02, 2005
A slightly better alternative GB/CA/1912
This is a somewhat larger, faster, better protected GB/CA/1912 armored cruiser design. This is the Springsharp report:
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