GB/BB/1905, Great Britain Dreadnought Cruiser laid down 1905 (Engine 1917)
Displacement:
20,213 t light; 21,073 t standard; 23,413 t normal; 25,286 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(625.00 ft / 618.00 ft) x 85.00 ft x (26.00 / 27.71 ft)
(190.50 m / 188.37 m) x 25.91 m x (7.92 / 8.44 m)
Armament:
8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 90 per gun
Breech loading guns in turret on barbette mounts, 1905 Model
3 x Twin mounts on centreline ends, evenly spread
1 raised mount aft - superfiring
1 x Twin mount on centreline, forward deck aft
16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
Quick firing guns in casemate mounts, 1905 Model
16 x Single mounts on sides, evenly spread
8 raised mounts
Weight of broadside 7,487 lbs / 3,396 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 405.00 ft / 123.44 m 9.00 ft / 2.74 m
Ends: 4.00" / 102 mm 170.00 ft / 51.82 m 12.00 ft / 3.66 m
43.00 ft / 13.11 m Unarmoured ends
Upper: 7.00" / 178 mm 405.00 ft / 123.44 m 8.00 ft / 2.44 m
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 395.00 ft / 120.40 m 26.00 ft / 7.92 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 7.00" / 178 mm 10.0" / 254 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Armoured deck - multiple decks: 3.00" / 76 mm For and Aft decks
Forecastle: 3.00" / 76 mm Quarter deck: 3.00" / 76 mm
- Conning towers: Forward 10.00" / 254 mm, Aft 0.00" / 0 mm
Machinery:
Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 66,702 shp / 49,760 Kw = 26.00 kts
Range 5,400nm at 16.00 kts
Bunker at max displacement = 4,213 tons (100% coal)
Complement:
946 - 1,230
Cost:
£1.760 million / $7.039 million
Distribution of weights at normal displacement:
Armament: 1,331 tons, 5.7 %
Armour: 7,921 tons, 33.8 %
- Belts: 2,836 tons, 12.1 %
- Torpedo bulkhead: 760 tons, 3.2 %
- Armament: 2,004 tons, 8.6 %
- Armour Deck: 2,145 tons, 9.2 %
- Conning Tower: 176 tons, 0.8 %
Machinery: 2,690 tons, 11.5 %
Hull, fittings & equipment: 8,271 tons, 35.3 %
Fuel, ammunition & stores: 3,200 tons, 13.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
43,692 lbs / 19,818 Kg = 50.6 x 12.0 " / 305 mm shells or 6.9 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 5.2 ft / 1.6 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.72
Seaboat quality (Average = 1.00): 1.41
Hull form characteristics:
Hull has low quarterdeck ,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.600 / 0.608
Length to Beam Ratio: 7.27 : 1
'Natural speed' for length: 24.86 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -3.00 degrees
Stern overhang: -3.00 ft / -0.91 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 27.00 %, 28.00 ft / 8.53 m, 26.00 ft / 7.92 m
- Forward deck: 30.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m
- Aft deck: 10.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m
- Quarter deck: 33.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Average freeboard: 23.58 ft / 7.19 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 83.6 %
- Above water (accommodation/working, high = better): 201.1 %
Waterplane Area: 38,420 Square feet or 3,569 Square metres
Displacement factor (Displacement / loading): 119 %
Structure weight / hull surface area: 156 lbs/sq ft or 761 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.64
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily
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, January 14, 2008
A big British dreadnought cruiser: the GB/CB/1905
This is the cruiser variant of the battleship-cruiser design. The side armour is thinner and the speed is raised to 26 knots. The armament is 8-12in/45 on the centerline, with a super-firing turret aft. The secondary armament is the same 16-4in QF guns in casemates. The belt is 10in on the waterline. The design depends on lightweight machinery. This is the Springsharp report:
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