GB/BB/1921 "13", Great Britain Battlecruiser laid down 1923
Displacement:
51,067 t light; 53,474 t standard; 56,200 t normal; 58,381 t full load
Dimensions: Length overall / water x beam x draught
900.00 ft / 900.00 ft x 108.00 ft x 32.00 ft (normal load)
274.32 m / 274.32 m x 32.92 m x 9.75 m
Armament:
8 - 18.00" / 457 mm guns (4x2 guns), 2,916.00lbs / 1,322.68kg shells, 1923 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread, 2 raised mounts - superfiring
14 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1923 Model
Quick firing guns in casemate mounts
on side, all amidships
14 guns in hull casemates - Limited use in heavy seas
8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1923 Model
Anti-aircraft guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (4x4 guns), 2.00lbs / 0.91kg shells, 1923 Model
Breech loading guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 25,287 lbs / 11,470 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.0" / 330 mm 600.00 ft / 182.88 m 8.00 ft / 2.44 m
Ends: 5.00" / 127 mm 220.00 ft / 67.06 m 12.00 ft / 3.66 m
80.00 ft / 24.38 m Unarmoured ends
Upper: 10.0" / 254 mm 600.00 ft / 182.88 m 8.00 ft / 2.44 m
Main Belt covers 103 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 600.00 ft / 182.88 m 32.00 ft / 9.75 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.0" / 330 mm 9.00" / 229 mm 13.0" / 330 mm
2nd: 6.00" / 152 mm 4.00" / 102 mm 6.00" / 152 mm
- Armour deck: 5.00" / 127 mm, Conning tower: 13.00" / 330 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 175,851 shp / 131,185 Kw = 30.00 kts
Range 6,500nm at 15.00 kts
Bunker at max displacement = 4,907 tons
Complement:
1,824 - 2,372
Cost:
£15.317 million / $61.269 million
Distribution of weights at normal displacement:
Armament: 3,161 tons, 5.6 %
Armour: 19,699 tons, 35.1 %
- Belts: 5,170 tons, 9.2 %
- Torpedo bulkhead: 2,842 tons, 5.1 %
- Armament: 4,499 tons, 8.0 %
- Armour Deck: 6,777 tons, 12.1 %
- Conning Tower: 411 tons, 0.7 %
Machinery: 5,877 tons, 10.5 %
Hull, fittings & equipment: 22,331 tons, 39.7 %
Fuel, ammunition & stores: 5,133 tons, 9.1 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
72,606 lbs / 32,933 Kg = 24.9 x 18.0 " / 457 mm shells or 11.4 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 6.8 ft / 2.1 m
Roll period: 17.4 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.82
Seaboat quality (Average = 1.00): 1.16
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.632
Length to Beam Ratio: 8.33 : 1
'Natural speed' for length: 30.00 kts
Power going to wave formation at top speed: 48 %
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: 31.00 ft / 9.45 m
- Forecastle (20 %): 28.00 ft / 8.53 m
- Mid (50 %): 28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 24.24 ft / 7.39 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 93.5 %
- Above water (accommodation/working, high = better): 181.3 %
Waterplane Area: 73,264 Square feet or 6,806 Square metres
Displacement factor (Displacement / loading): 99 %
Structure weight / hull surface area: 220 lbs/sq ft or 1,074 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.01
- Longitudinal: 0.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
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Tuesday, January 23, 2007
The Springsharp report for a British "13 Class" ship
I did as I said and tried a British "13 Class" ship in Springsharp. Except for being much heavier than the Japanese design, the ship works quite well, especially considering the relatively narrow beam for 18in guns. This is the Springsharp report:
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