GB/CA/1907, Great Britain Armoured Cruiser laid down 1909
Displacement:
15,134 t light; 15,827 t standard; 17,600 t normal; 19,019 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(555.00 ft / 550.00 ft) x 80.00 ft x (25.00 / 26.60 ft)
(169.16 m / 167.64 m) x 24.38 m x (7.62 / 8.11 m)
Armament:
6 - 12.00" / 305 mm 50.0 cal guns - 914.66lbs / 414.88kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1909 Model
2 x Triple mounts on centreline ends, evenly spread
8 - 6.00" / 152 mm 50.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
Quick firing guns in casemate mounts, 1909 Model
8 x Single mounts on sides, forward deck aft
8 hull mounts in casemates- Limited use in heavy seas
Weight of broadside 6,288 lbs / 2,852 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 350.00 ft / 106.68 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 98 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 350.00 ft / 106.68 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Protected deck - single deck: 3.00" / 76 mm For and Aft decks
Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm
- Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 67,326 shp / 50,225 Kw = 27.00 kts
Range 5,600nm at 15.00 kts
Bunker at max displacement = 3,192 tons
Complement:
763 - 993
Cost:
£1.575 million / $6.301 million
Distribution of weights at normal displacement:
Armament: 1,257 tons, 7.1 %
Armour: 4,240 tons, 24.1 %
- Belts: 1,454 tons, 8.3 %
- Torpedo bulkhead: 324 tons, 1.8 %
- Armament: 872 tons, 5.0 %
- Armour Deck: 1,503 tons, 8.5 %
- Conning Tower: 87 tons, 0.5 %
Machinery: 3,060 tons, 17.4 %
Hull, fittings & equipment: 6,576 tons, 37.4 %
Fuel, ammunition & stores: 2,466 tons, 14.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
26,909 lbs / 12,206 Kg = 31.1 x 12.0 " / 305 mm shells or 3.5 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 5.4 ft / 1.6 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.71
Seaboat quality (Average = 1.00): 1.43
Hull form characteristics:
Hull has low quarterdeck ,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.560 / 0.569
Length to Beam Ratio: 6.88 : 1
'Natural speed' for length: 23.45 kts
Power going to wave formation at top speed: 56 %
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 (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 29.00 ft / 8.84 m, 28.00 ft / 8.53 m
- Forward deck: 30.00 %, 28.00 ft / 8.53 m, 28.00 ft / 8.53 m
- Aft deck: 12.00 %, 28.00 ft / 8.53 m, 28.00 ft / 8.53 m
- Quarter deck: 33.00 %, 20.00 ft / 6.10 m, 20.00 ft / 6.10 m
- Average freeboard: 25.46 ft / 7.76 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 117.5 %
- Above water (accommodation/working, high = better): 216.7 %
Waterplane Area: 30,997 Square feet or 2,880 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 149 lbs/sq ft or 725 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.45
- 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
Good seaboat, rides out heavy weather easily
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