GB/CB/1905 Design Study, Enter country Enter ship type laid down 1905 (Engine 1910)
Displacement:
22,796 t light; 23,601 t standard; 26,500 t normal; 28,819 t full load
Dimensions: Length overall / water x beam x draught
770.00 ft / 770.00 ft x 85.00 ft x 26.00 ft (normal load)
234.70 m / 234.70 m x 25.91 m x 7.92 m
Armament:
6 - 12.00" / 305 mm guns (3x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
Quick firing guns in deck mounts with hoists
on side, all amidships
Weight of broadside 6,048 lbs / 2,743 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 6.00" / 152 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
Ends: Unarmoured
Upper: 4.00" / 102 mm 540.00 ft / 164.59 m 8.00 ft / 2.44 m
Main Belt covers 108 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
2.00" / 51 mm 540.00 ft / 164.59 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 4.00" / 102 mm 8.00" / 203 mm
2nd: 2.00" / 51 mm 2.00" / 51 mm 2.00" / 51 mm
- Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 4 shafts, 130,202 shp / 97,130 Kw = 31.20 kts
Range 7,500nm at 15.00 kts
Bunker at max displacement = 5,218 tons
Complement:
1,038 - 1,350
Cost:
£2.186 million / $8.744 million
Distribution of weights at normal displacement:
Armament: 756 tons, 2.9 %
Armour: 5,948 tons, 22.4 %
- Belts: 1,795 tons, 6.8 %
- Torpedo bulkhead: 999 tons, 3.8 %
- Armament: 1,318 tons, 5.0 %
- Armour Deck: 1,682 tons, 6.3 %
- Conning Tower: 153 tons, 0.6 %
Machinery: 5,380 tons, 20.3 %
Hull, fittings & equipment: 10,711 tons, 40.4 %
Fuel, ammunition & stores: 3,704 tons, 14.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
38,534 lbs / 17,479 Kg = 44.6 x 12.0 " / 305 mm shells or 4.9 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 5.2 ft / 1.6 m
Roll period: 15.6 seconds
Steadiness - As gun platform (Average = 50 %): 74 %
- Recoil effect (Restricted arc if above 1.00): 0.64
Seaboat quality (Average = 1.00): 1.48
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.545
Length to Beam Ratio: 9.06 : 1
'Natural speed' for length: 27.75 kts
Power going to wave formation at top speed: 51 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): -2.00 degrees
Stern overhang: -1.00 ft / -0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 33.00 ft / 10.06 m
- Forecastle (20 %): 30.00 ft / 9.14 m
- Mid (67 %): 30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
- Quarterdeck (15 %): 22.00 ft / 6.71 m
- Stern: 22.00 ft / 6.71 m
- Average freeboard: 27.60 ft / 8.41 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 114.4 %
- Above water (accommodation/working, high = better): 231.8 %
Waterplane Area: 45,465 Square feet or 4,224 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 152 lbs/sq ft or 743 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.96
- Longitudinal: 1.37
- 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
Good seaboat, rides out heavy weather easily
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, August 27, 2005
I have a sheet that must go with a drawing I have seen for an alternate GB/CB/1905 design
This is more like what Frank Fox and David K. Brown had recommended to me in 2001. They had actually recommended 8-12in guns and a 6in belt, with less speed than 32 or 33 knots. This seems to be an alternate specification that would accompany a drawing I have seen for an alternate GB/CB/1905 design with 6-12in and 8-6in guns. The belt would be 4-6in and the speed would be 31.2knots. To achieve adequate hull strength, I needed to cheat in Springsharp and use lighter-weight machinery. The ship is very pleasant three twin turrets, the second in a superfiring position, a tripod foremast and twin funnels with the fore funnel raised. This is the Springsharp report:
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