GB/CB/1905 design study B1, Great Britain Battlecruiser laid down 1905
Displacement:
29,113 t light; 30,087 t standard; 34,666 t normal; 38,329 t full load
Dimensions: Length overall / water x beam x draught
770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load)
234.70 m / 234.70 m x 25.91 m x 7.92 m
Armament:
6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, all raised mounts - superfiring
9 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
Quick firing guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 6,156 lbs / 2,792 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, 123,075 shp / 91,814 Kw = 29.00 kts
Range 7,500nm at 15.00 kts
Bunker at max displacement = 8,242 tons
Complement:
1,269 - 1,651
Cost:
£2.971 million / $11.883 million
Distribution of weights at normal displacement:
Armament: 770 tons, 2.2 %
Armour: 6,654 tons, 19.2 %
- Belts: 2,033 tons, 5.9 %
- Torpedo bulkhead: 638 tons, 1.8 %
- Armament: 1,528 tons, 4.4 %
- Armour Deck: 2,454 tons, 7.1 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 9,324 tons, 26.9 %
Hull, fittings & equipment: 12,366 tons, 35.7 %
Fuel, ammunition & stores: 5,553 tons, 16.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
40,932 lbs / 18,566 Kg = 47.4 x 12.0 " / 305 mm shells or 4.0 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 5.4 ft / 1.7 m
Roll period: 15.3 seconds
Steadiness - As gun platform (Average = 50 %): 83 %
- Recoil effect (Restricted arc if above 1.00): 0.79
Seaboat quality (Average = 1.00): 1.66
Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.713
Length to Beam Ratio: 9.06 : 1
'Natural speed' for length: 27.75 kts
Power going to wave formation at top speed: 51 %
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): 135.9 %
- Above water (accommodation/working, high = better): 243.4 %
Waterplane Area: 53,069 Square feet or 4,930 Square metres
Displacement factor (Displacement / loading): 110 %
Structure weight / hull surface area: 151 lbs/sq ft or 738 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.36
- 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
I was just looking at my alternate design for the GB/CB/1905 battlecruises
I was looking at what I had proposed to my friend Cliff for the GB/CB/1905 battlecruisers. This is a ship that would be more acceptable to Frank Fox and D.K. Brown than what Cliff wanted to have. This ship has 6-12in/45 guns with the same 9-6in/50 QF guns mounted on deck. The armor, in this case, is a 6in belt, 16ft high, a 2.5in deck, and 10in turret faces and 8in barbettes for the 12in guns. I was only able to achieve 29 knots in Springsharp, but that is still not too bad for 1905. When you realize that the Invincibles also had a 6 gun broadside, this looks pretty good, except that the cost would have been unacceptable. The size ballooned all out of proportion, but the resulting ship is a good seaboat and has good stability. I realized that the belt was too short, so that grew to 500 ft long. Springsharp is still complaining, but I am happy, as the light and standard displacement aren't so out of line. Mostly, the range I specified is driving up the normal and maximum displacements.
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