\GB/BB/1906, Great Britain Battlecruiser laid down 1906 (Engine 1911)
Displacement:
20,854 t light; 21,808 t standard; 26,192 t normal; 29,700 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(645.00 ft / 638.00 ft) x 82.00 ft x (27.00 / 30.07 ft)
(196.60 m / 194.46 m) x 24.99 m x (8.23 / 9.16 m)
Armament:
8 - 12.00" / 305 mm 45.0 cal guns - 871.37lbs / 395.24kg shells, 100 per gun
Breech loading guns in turret on barbette mounts, 1906 Model
4 x Twin mounts on centreline ends, evenly spread
2 raised mounts - superfiring
16 - 4.00" / 102 mm 45.0 cal guns - 32.27lbs / 14.64kg shells, 150 per gun
Quick firing guns in casemate mounts, 1906 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: 8.00" / 203 mm 430.00 ft / 131.06 m 9.00 ft / 2.74 m
Ends: Unarmoured
Upper: 6.00" / 152 mm 430.00 ft / 131.06 m 8.00 ft / 2.44 m
Main Belt covers 104 % of normal length
- Torpedo Bulkhead - Additional damage containing bulkheads:
2.00" / 51 mm 430.00 ft / 131.06 m 27.00 ft / 8.23 m
Beam between torpedo bulkheads 56.00 ft / 17.07 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 8.00" / 203 mm 10.0" / 254 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Armoured deck - multiple decks:
For and Aft decks: 2.00" / 51 mm
Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm
- Conning towers: Forward 11.00" / 279 mm, Aft 8.00" / 203 mm
Machinery:
Coal fired boilers, steam turbines,
Direct drive, 4 shafts, 82,731 shp / 61,717 Kw = 27.00 kts
Range 7,500nm at 16.00 kts
Bunker at max displacement = 7,891 tons (100% coal)
Complement:
1,029 - 1,338
Cost:
£1.923 million / $7.691 million
Distribution of weights at normal displacement:
Armament: 1,331 tons, 5.1 %
- Guns: 1,331 tons, 5.1 %
Armour: 7,070 tons, 27.0 %
- Belts: 2,188 tons, 8.4 %
- Torpedo bulkhead: 859 tons, 3.3 %
- Armament: 2,171 tons, 8.3 %
- Armour Deck: 1,491 tons, 5.7 %
- Conning Towers: 361 tons, 1.4 %
Machinery: 3,693 tons, 14.1 %
Hull, fittings & equipment: 8,759 tons, 33.4 %
Fuel, ammunition & stores: 5,338 tons, 20.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
42,557 lbs / 19,303 Kg = 49.3 x 12.0 " / 305 mm shells or 6.1 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 4.6 ft / 1.4 m
Roll period: 16.0 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0.82
Seaboat quality (Average = 1.00): 1.29
Hull form characteristics:
Hull has low quarterdeck ,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.649 / 0.661
Length to Beam Ratio: 7.78 : 1
'Natural speed' for length: 25.26 kts
Power going to wave formation at top speed: 53 %
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 (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 29.00 ft / 8.84 m, 27.00 ft / 8.23 m
- Forward deck: 30.00 %, 27.00 ft / 8.23 m, 26.00 ft / 7.92 m
- Aft deck: 14.00 %, 26.00 ft / 7.92 m, 26.00 ft / 7.92 m
- Quarter deck: 31.00 %, 18.00 ft / 5.49 m, 18.00 ft / 5.49 m
- Average freeboard: 24.12 ft / 7.35 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 102.2 %
- Above water (accommodation/working, high = better): 195.2 %
Waterplane Area: 40,040 Square feet or 3,720 Square metres
Displacement factor (Displacement / loading): 125 %
Structure weight / hull surface area: 155 lbs/sq ft or 758 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.52
- Overall: 1.00
Adequate machinery, storage, compartmentation space
Excellent accommodation and workspace room
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.
Saturday, May 10, 2008
The battlecruiser analog of the GB/BB/1906: the GB/CB/1906
The battlecruiser version of the GB/BB/1906 naturally has lighter armour and higher speed. The lower belt is still 8in thick, so it is not another Invincible. The speed is also higher at 27 knots (although I had heard that an invincible might be able to make higher speed). The ships have 8-12in/45 and 16-4in QF guns. This is the Springsharp report:
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