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
This is a forum for discussion of topics relating to the Dreadnought era, prior to the ascendency of naval aviation. We will be discussing history, ship design, and naval wargaming.
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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