GB/CB/1921 Super Fast, Great Britain Light Battlecruiser laid down 1921 (Engine 1941)
Displacement:
34,937 t light; 36,283 t standard; 38,265 t normal; 39,851 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(899.34 ft / 894.00 ft) x 97.00 ft x (33.00 / 33.95 ft)
(274.12 m / 272.49 m) x 29.57 m x (10.06 / 10.35 m)
Armament:
4 - 17.00" / 432 mm 45.0 cal guns - 2,480.00lbs / 1,124.91kg shells, 90 per gun
Breech loading guns in turret on barbette mounts , 1921 Model
1 x Twin mount on centreline, forward deck forward
1 x Twin mount on centreline, forward deck aft
12 - 5.50" / 140 mm 50.0 cal guns - 85.00lbs / 38.56kg shells, 150 per gun
Quick firing guns in deck and hoist mounts , 1921 Model
12 x Single mounts on sides, forward deck aft
Weight of broadside 10,940 lbs / 10,940 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 7.00" / 178 mm 490.00 ft / 149.35 m 8.00 ft / 2.44 m
Ends: Unarmoured
Upper: 5.00" / 127 mm 490.00 ft / 149.35 m 8.00 ft / 2.44 m
Main Belt covers 84 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.50" / 38 mm 490.00 ft / 149.35 m 33.00 ft / 10.06 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: 4.00" / 102 mm 2.00" / 51 mm 4.00" / 102 mm
- Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 343,077 shp / 255,935 Kw = 40.00 kts
Range 6,500nm at 16.00 kts
Bunker at max displacement = 3,568 tons
Complement:
1,367 - 1,778
Cost:
£8.977 million / $35.910 million
Distribution of weights at normal displacement:
Armament: 1,883 tons, 4.9 %
Armour: 7,843 tons, 20.5 %
- Belts: 2,029 tons, 5.3 %
- Torpedo bulkhead: 897 tons, 2.3 %
- Armament: 1,482 tons, 3.9 %
- Armour Deck: 3,239 tons, 8.5 %
- Conning Tower: 196 tons, 0.5 %
Machinery: 9,067 tons, 23.7 %
Hull, fittings & equipment: 16,796 tons, 43.9 %
Fuel, ammunition & stores: 3,328 tons, 8.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
45,577 lbs / 20,673 Kg = 18.6 x 17.0 " / 432 mm shells or 4.9 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 6.2 ft / 1.9 m
Roll period: 16.4 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0.59
Seaboat quality (Average = 1.00): 1.06
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and small transom stern
Block coefficient (normal/deep): 0.468 / 0.474
Length to Beam Ratio: 9.22 : 1
'Natural speed' for length: 34.48 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 8.00 degrees
Stern overhang: -3.00 ft / -0.91 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 38.00 ft / 11.58 m, 33.00 ft / 10.06 m
- Forward deck: 35.00 %, 33.00 ft / 10.06 m, 32.00 ft / 9.75 m
- Aft deck: 20.00 %, 24.00 ft / 7.32 m, 24.00 ft / 7.32 m
- Quarter deck: 20.00 %, 24.00 ft / 7.32 m, 26.00 ft / 7.92 m
- Average freeboard: 29.93 ft / 9.12 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 127.6 %
- Above water (accommodation/working, high = better): 239.1 %
Waterplane Area: 58,358 Square feet or 5,422 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 186 lbs/sq ft or 907 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 1.61
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
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Friday, April 20, 2007
A Super Fast Battlecruiser variant
I had this design, but I had forgotten to use a transom stern. Having the small transom, in typical British 1921 style, allowed me to improve the overall qualities and decrease displacement. The GB/CB/1921 Super Fast carried 4-17in/45 BLR and 12-5.5in QF guns. The lower belt is 8in and the deck is 3in. The top speed is 40 knots and the ship has a range of 6,500nm at 16 knots. This is a photo that I struggled to produce using a chisle and hammer, which is all I have to work with in a locked down environment, and it shows (you should be able to click on it to get a larger photo):
This is the Springsharp report:
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