GB/CB/Super Fast, Great Britain Battlecruiser laid down 1921 (Engine 1950)
Displacement:
36,667 t light; 37,948 t standard; 39,546 t normal; 40,824 t full load
Dimensions: Length overall / water x beam x draught
836.26 ft / 835.00 ft x 112.00 ft x 37.00 ft (normal load)
254.89 m / 254.51 m x 34.14 m x 11.28 m
Armament:
4 - 17.00" / 432 mm guns (2x2 guns), 2,456.50lbs / 1,114.25kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts
16 - 5.00" / 127 mm guns (8x2 guns), 62.50lbs / 28.35kg shells, 1921 Model
Quick firing guns in deck mounts with hoists
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 10,826 lbs / 4,911 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 580.00 ft / 176.78 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 107 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.50" / 38 mm 580.00 ft / 176.78 m 24.00 ft / 7.32 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 9.00" / 229 mm 5.00" / 127 mm 8.00" / 203 mm
2nd: 1.00" / 25 mm - -
- Armour deck: 2.00" / 51 mm, Conning tower: 5.00" / 127 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 8 shafts, 377,615 shp / 281,701 Kw = 39.00 kts
Range 7,000nm at 14.00 kts
Bunker at max displacement = 2,876 tons
Complement:
1,401 - 1,822
Cost:
£9.380 million / $37.518 million
Distribution of weights at normal displacement:
Armament: 1,353 tons, 3.4 %
Armour: 7,864 tons, 19.9 %
- Belts: 3,297 tons, 8.3 %
- Torpedo bulkhead: 773 tons, 2.0 %
- Armament: 1,540 tons, 3.9 %
- Armour Deck: 2,130 tons, 5.4 %
- Conning Tower: 125 tons, 0.3 %
Machinery: 9,034 tons, 22.8 %
Hull, fittings & equipment: 18,415 tons, 46.6 %
Fuel, ammunition & stores: 2,879 tons, 7.3 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
42,280 lbs / 19,178 Kg = 17.2 x 17.0 " / 432 mm shells or 5.3 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 7.0 ft / 2.1 m
Roll period: 17.8 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.400
Length to Beam Ratio: 7.46 : 1
'Natural speed' for length: 28.90 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 56
Bow angle (Positive = bow angles forward): 2.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 36.00 ft / 10.97 m
- Forecastle (45 %): 33.00 ft / 10.06 m
- Mid (45 %): 33.00 ft / 10.06 m (25.00 ft / 7.62 m aft of break)
- Quarterdeck (15 %): 25.00 ft / 7.62 m
- Stern: 25.00 ft / 7.62 m
- Average freeboard: 29.14 ft / 8.88 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 121.3 %
- Above water (accommodation/working, high = better): 195.7 %
Waterplane Area: 57,567 Square feet or 5,348 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 210 lbs/sq ft or 1,027 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.93
- Longitudinal: 1.93
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
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.
Wednesday, February 02, 2005
My latest attempt at a Super Fast Battlecruiser using Springsharp
I took another shot a seeing if I could make the Super Fast Battlecruiser work in Springsharp. I wrote about this last October, and had my 1970's era drawing. I expended considerable effort to make the design have adequate seakeeping ability. The ship had to get wider, longer, and deeper. Even then, the best I could do was 39 knots. It at least captures the intent, although at a greater cost.
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