GB/CA/1902, Great Britain Armoured Cruiser laid down 1902
Displacement:
13,919 t light; 14,470 t standard; 16,653 t normal; 18,399 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(502.00 ft / 495.00 ft) x 75.00 ft x (25.00 / 27.19 ft)
(153.01 m / 150.88 m) x 22.86 m x (7.62 / 8.29 m)
Armament:
4 - 9.20" / 234 mm 45.0 cal guns - 380.00lbs / 172.37kg shells, 120 per gun
Breech loading guns in turret on barbette mounts, 1902 Model
2 x Twin mounts on centreline ends, evenly spread
14 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
Quick firing guns in casemate mounts, 1902 Model
14 x Single mounts on sides, evenly spread
8 hull mounts in casemates- Limited use in heavy seas
Weight of broadside 2,920 lbs / 1,324 kg
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 320.00 ft / 97.54 m 16.00 ft / 4.88 m
Ends: 4.00" / 102 mm 175.00 ft / 53.34 m 12.00 ft / 3.66 m
Main Belt covers 99 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 320.00 ft / 97.54 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 6.00" / 152 mm 4.00" / 102 mm 6.00" / 152 mm
2nd: 4.00" / 102 mm 4.00" / 102 mm 4.00" / 102 mm
- Protected deck - single deck: 2.00" / 51 mm For and Aft decks
Forecastle: 2.00" / 51 mm Quarter deck: 2.00" / 51 mm
- Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 36,801 ihp / 27,453 Kw = 23.00 kts
Range 5,600nm at 14.00 kts
Bunker at max displacement = 3,929 tons (100% coal)
Complement:
732 - 952
Cost:
£1.487 million / $5.947 million
Distribution of weights at normal displacement:
Armament: 610 tons, 3.7 %
Armour: 3,612 tons, 21.7 %
- Belts: 1,653 tons, 9.9 %
- Torpedo bulkhead: 296 tons, 1.8 %
- Armament: 541 tons, 3.2 %
- Armour Deck: 1,038 tons, 6.2 %
- Conning Tower: 84 tons, 0.5 %
Machinery: 5,576 tons, 33.5 %
Hull, fittings & equipment: 4,121 tons, 24.7 %
Fuel, ammunition & stores: 2,734 tons, 16.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,089 lbs / 6,391 Kg = 36.2 x 9.2 " / 234 mm shells or 1.9 torpedoes
Stability (Unstable if below 1.00): 1.66
Metacentric height 7.5 ft / 2.3 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 77 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.53
Hull form characteristics:
Hull has a flush deck,
a ram bow and a cruiser stern
Block coefficient (normal/deep): 0.628 / 0.638
Length to Beam Ratio: 6.60 : 1
'Natural speed' for length: 22.25 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -3.00 degrees
Stern overhang: -2.00 ft / -0.61 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 25.00 %, 24.00 ft / 7.32 m, 21.00 ft / 6.40 m
- Forward deck: 30.00 %, 21.00 ft / 6.40 m, 19.00 ft / 5.79 m
- Aft deck: 20.00 %, 19.00 ft / 5.79 m, 19.00 ft / 5.79 m
- Quarter deck: 25.00 %, 19.00 ft / 5.79 m, 20.00 ft / 6.10 m
- Average freeboard: 20.23 ft / 6.16 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 165.1 %
- Above water (accommodation/working, high = better): 142.1 %
Waterplane Area: 27,869 Square feet or 2,589 Square metres
Displacement factor (Displacement / loading): 99 %
Structure weight / hull surface area: 109 lbs/sq ft or 530 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.68
- Overall: 0.99
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
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Friday, July 27, 2007
I thought that I would try to do a better version of what I had originally specified at the "My Victorian Navy" blog
I thought that I would like to see if I could design a 23 knot version of the 21 knot British armoured cruiser that can be seen at the "My Victorian Navy" blog. This is a ship with a 6in armour basis, a 2in deck, 4-9.2in/45 and 14-6in QF guns. The design was inspired by the British-built armoured cruisers built for the Japanese navy. This is the Springsharp report:
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