GB/CA/1942, Great Britain Armoured Cruiser laid down 1942
Displacement:
17,687 t light; 18,366 t standard; 19,750 t normal; 20,857 t full load
Dimensions: Length overall / water x beam x draught
718.89 ft / 715.00 ft x 78.00 ft x 25.00 ft (normal load)
219.12 m / 217.93 m x 23.77 m x 7.62 m
Armament:
9 - 9.20" / 234 mm guns (3x3 guns), 380.00lbs / 172.37kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 4.50" / 114 mm guns (6x2 guns), 45.56lbs / 20.67kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships
48 - 1.57" / 40.0 mm guns (12x4 guns), 2.00lbs / 0.91kg shells, 1942 Model
Quick firing guns in deck mounts
on side ends, evenly spread, 7 raised mounts - superfiring
28 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Quick firing guns in deck mounts
on side ends, evenly spread, 18 raised mounts - superfiring
Weight of broadside 4,070 lbs / 1,846 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 490.00 ft / 149.35 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 105 % of normal length
- Torpedo Bulkhead:
1.00" / 25 mm 490.00 ft / 149.35 m 21.00 ft / 6.40 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 4.00" / 102 mm 4.00" / 102 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
- Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 120,428 shp / 89,839 Kw = 32.00 kts
Range 7,800nm at 15.00 kts
Bunker at max displacement = 2,492 tons
Complement:
832 - 1,082
Cost:
£9.516 million / $38.064 million
Distribution of weights at normal displacement:
Armament: 519 tons, 2.6 %
Armour: 6,557 tons, 33.2 %
- Belts: 2,770 tons, 14.0 %
- Torpedo bulkhead: 381 tons, 1.9 %
- Armament: 1,226 tons, 6.2 %
- Armour Deck: 2,054 tons, 10.4 %
- Conning Tower: 126 tons, 0.6 %
Machinery: 3,146 tons, 15.9 %
Hull, fittings & equipment: 7,464 tons, 37.8 %
Fuel, ammunition & stores: 2,063 tons, 10.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
29,889 lbs / 13,558 Kg = 76.8 x 9.2 " / 234 mm shells or 4.4 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 4.7 ft / 1.4 m
Roll period: 15.1 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 1.07
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.496
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 26.74 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.00 ft / 8.23 m
- Forecastle (20 %): 19.00 ft / 5.79 m
- Mid (50 %): 19.00 ft / 5.79 m
- Quarterdeck (15 %): 19.00 ft / 5.79 m
- Stern: 19.00 ft / 5.79 m
- Average freeboard: 19.64 ft / 5.99 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 97.3 %
- Above water (accommodation/working, high = better): 161.0 %
Waterplane Area: 37,016 Square feet or 3,439 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 136 lbs/sq ft or 663 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.05
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
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Tuesday, October 25, 2005
A 1942-style British armoured cruiser (UPDATED)
I have thought about what a British armoured cruiser might have been like, if it were laid down in 1942. It has 9-9.2in BLR, 12-4.5in DP, 48-40mm AA, and 28-20mm AA guns. The armour basis is now 8in. The speed is a modest 32 knots. I initially underestimated the displacement that would be necessary. I also gave too long of an armoured citadel. I have shortened the armoured length. This allowed the armour basis to increase to 8in, instead of 7in. This is the Springsharp report:
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