GB/BB/1902 Heavily Armed, Great Britain Battleship laid down 1902
Displacement:
14,614 t light; 15,372 t standard; 17,604 t normal; 19,390 t full load
Dimensions: Length overall / water x beam x draught
480.00 ft / 480.00 ft x 78.00 ft x 25.00 ft (normal load)
146.30 m / 146.30 m x 23.77 m x 7.62 m
Armament:
4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1902 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
8 - 8.00" / 203 mm guns (4x2 guns), 256.00lbs / 116.12kg shells, 1902 Model
Breech loading guns in turrets (on barbettes)
on side, all amidships
12 - 7.00" / 178 mm guns in single mounts, 171.50lbs / 77.79kg shells, 1902 Model
Breech loading guns in casemate mounts
on side, evenly spread
12 guns in hull casemates - Limited use in heavy seas
Weight of broadside 7,562 lbs / 3,430 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 360.00 ft / 109.73 m 8.00 ft / 2.44 m
Ends: 8.00" / 203 mm 120.00 ft / 36.58 m 8.00 ft / 2.44 m
Upper: 6.00" / 152 mm 360.00 ft / 109.73 m 8.00 ft / 2.44 m
Main Belt covers 115 % of normal length
- Torpedo Bulkhead:
1.50" / 38 mm 360.00 ft / 109.73 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11.0" / 279 mm 7.00" / 178 mm 11.0" / 279 mm
2nd: 8.00" / 203 mm 5.00" / 127 mm 8.00" / 203 mm
3rd: 7.00" / 178 mm 7.00" / 178 mm 7.00" / 178 mm
- Armour deck: 1.50" / 38 mm, Conning tower: 11.00" / 279 mm
Machinery:
Coal fired boilers, complex reciprocating steam engines,
Direct drive, 2 shafts, 15,182 ihp / 11,326 Kw = 18.00 kts
Range 4,600nm at 15.00 kts
Bunker at max displacement = 4,018 tons (100% coal)
Complement:
763 - 993
Cost:
£1.628 million / $6.510 million
Distribution of weights at normal displacement:
Armament: 945 tons, 5.4 %
Armour: 5,618 tons, 31.9 %
- Belts: 2,251 tons, 12.8 %
- Torpedo bulkhead: 500 tons, 2.8 %
- Armament: 1,905 tons, 10.8 %
- Armour Deck: 802 tons, 4.6 %
- Conning Tower: 160 tons, 0.9 %
Machinery: 2,300 tons, 13.1 %
Hull, fittings & equipment: 5,750 tons, 32.7 %
Fuel, ammunition & stores: 2,990 tons, 17.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21,422 lbs / 9,717 Kg = 24.8 x 12.0 " / 305 mm shells or 3.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 4.8 ft / 1.5 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 85 %
- Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality (Average = 1.00): 1.70
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.658
Length to Beam Ratio: 6.15 : 1
'Natural speed' for length: 21.91 kts
Power going to wave formation at top speed: 43 %
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: 22.00 ft / 6.71 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (50 %): 18.00 ft / 5.49 m
- Quarterdeck (15 %): 18.00 ft / 5.49 m
- Stern: 18.00 ft / 5.49 m
- Average freeboard: 18.32 ft / 5.58 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 111.4 %
- Above water (accommodation/working, high = better): 129.9 %
Waterplane Area: 28,899 Square feet or 2,685 Square metres
Displacement factor (Displacement / loading): 99 %
Structure weight / hull surface area: 141 lbs/sq ft or 687 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.94
- Longitudinal: 1.73
- Overall: 1.00
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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Saturday, October 14, 2006
The Heavily-Armed Battleship from the January 1902 Senior Officer's War Course
On page 15 of John Robert's book, Battlecruisers (about British battlecruisers), he has the high-level specification for a heavily-armed battleship and a lightly-armed battleship that were used in the "Senior Officers' War Course, January 1902". There are no dimensions, just a displacement, speed, armament, and armour. I extrapolated from that description to create a Springsharp design:
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