GB/CB/SuperFast A2, Great Britain Battlecruiser laid down 1921
Displacement:
37,159 t light; 38,389 t standard; 39,712 t normal; 40,770 t full load
Dimensions: Length overall / water x beam x draught
930.65 ft / 930.00 ft x 112.00 ft x 32.00 ft (normal load)
283.66 m / 283.46 m x 34.14 m x 9.75 m
Armament:
4 - 17.00" / 432 mm guns in single mounts, 2,456.50lbs / 1,114.25kg shells, 1921 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, all raised mounts - superfiring
16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1921 Model
Quick firing guns in deck mounts
on side ends, evenly spread, all raised mounts - superfiring
Weight of broadside 10,338 lbs / 4,689 kg
Shells per gun, main battery: 75
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 425.00 ft / 129.54 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 70 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 425.00 ft / 129.54 m 27.00 ft / 8.23 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm - -
- Armour deck: 1.50" / 38 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 324,033 shp / 241,728 Kw = 38.00 kts
Range 3,600nm at 15.00 kts
Bunker at max displacement = 2,381 tons
Complement:
1,406 - 1,828
Cost:
£10.050 million / $40.200 million
Distribution of weights at normal displacement:
Armament: 1,292 tons, 3.3 %
Armour: 5,342 tons, 13.5 %
- Belts: 1,229 tons, 3.1 %
- Torpedo bulkhead: 425 tons, 1.1 %
- Armament: 1,890 tons, 4.8 %
- Armour Deck: 1,798 tons, 4.5 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 11,158 tons, 28.1 %
Hull, fittings & equipment: 19,367 tons, 48.8 %
Fuel, ammunition & stores: 2,553 tons, 6.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
38,780 lbs / 17,590 Kg = 15.8 x 17.0 " / 432 mm shells or 4.2 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 7.7 ft / 2.4 m
Roll period: 16.9 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality (Average = 1.00): 1.13
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.417
Length to Beam Ratio: 8.30 : 1
'Natural speed' for length: 30.50 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 1.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 37.00 ft / 11.28 m
- Forecastle (20 %): 35.00 ft / 10.67 m
- Mid (47 %): 35.00 ft / 10.67 m (27.00 ft / 8.23 m aft of break)
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 28.90 ft / 8.81 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 140.2 %
- Above water (accommodation/working, high = better): 266.2 %
Waterplane Area: 64,803 Square feet or 6,020 Square metres
Displacement factor (Displacement / loading): 105 %
Structure weight / hull surface area: 204 lbs/sq ft or 996 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.32
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
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Thursday, January 13, 2005
The bloated, reduced capability "Super Fast Battlecruiser"
In order to get acceptable seakeeping ability, I had to greatly lengthen the "Super Fast Battlecruiser", give it greater beam, and reduce speed to 37 knots (still quite fast, but not like I wanted). I also increased the freeboard, and slightly lengthed the forecastle.
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