GB/DD/1921 very fast, Great Britain Destroyer laid down 1921 (Engine 1950)
Displacement:
1,717 t light; 1,788 t standard; 1,970 t normal; 2,116 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(389.52 ft / 387.00 ft) x 36.00 ft x (12.50 / 13.07 ft)
(118.73 m / 117.96 m) x 10.97 m x (3.81 / 3.99 m)
Armament:
4 - 5.00" / 127 mm 55.0 cal guns - 65.00lbs / 29.48kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1921 Model
4 x Single mounts on centreline ends, evenly spread
2 raised mounts - superfiring
8 - 1.57" / 40.0 mm 45.0 cal guns - 2.00lbs / 0.91kg shells, 150 per gun
Anti-air guns in deck mounts, 1921 Model
4 x Twin mounts on sides, forward deck aft
4 raised mounts
Weight of broadside 276 lbs / 125 kg
6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.425 t each, 8.551 t total
In 2 sets of deck mounted centre rotating tubes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 2.00" / 51 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 50,701 shp / 37,823 Kw = 36.50 kts
Range 4,700nm at 14.00 kts
Bunker at max displacement = 328 tons
Complement:
147 - 192
Cost:
£0.587 million / $2.349 million
Distribution of weights at normal displacement:
Armament: 101 tons, 5.1 %
- Guns: 92 tons, 4.7 %
- Torpedoes: 9 tons, 0.4 %
Armour: 32 tons, 1.6 %
- Armament: 32 tons, 1.6 %
Machinery: 987 tons, 50.1 %
Hull, fittings & equipment: 597 tons, 30.3 %
Fuel, ammunition & stores: 253 tons, 12.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
554 lbs / 251 Kg = 8.9 x 5.0 " / 127 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.5 ft / 0.4 m
Roll period: 12.5 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.49
Seaboat quality (Average = 1.00): 1.02
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.396 / 0.407
Length to Beam Ratio: 10.75 : 1
'Natural speed' for length: 22.63 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 6.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 18.00 %, 24.00 ft / 7.32 m, 22.00 ft / 6.71 m
- Forward deck: 17.00 %, 22.00 ft / 6.71 m, 22.00 ft / 6.71 m
- Aft deck: 50.00 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Quarter deck: 15.00 %, 14.00 ft / 4.27 m, 14.00 ft / 4.27 m
- Average freeboard: 16.94 ft / 5.16 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 176.6 %
- Above water (accommodation/working, high = better): 150.2 %
Waterplane Area: 8,877 Square feet or 825 Square metres
Displacement factor (Displacement / loading): 71 %
Structure weight / hull surface area: 35 lbs/sq ft or 173 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.45
- Longitudinal: 2.11
- Overall: 0.53
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
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.
Sunday, August 19, 2007
A very fast destroyer for 1921
I thought that the next design should be a very fast destroyer to be laid down in 1921. With the present Springsharp program, the ship has to quite long. Still, I have not done any as well as 36.5 knots for a destroyer before. The British had wanted to develop both 5in and 5.1in guns, but never got around do finalizing either caliber. This design has 4-5in guns, as this ship needs a substantial armament. This is the Springsharp report:
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