Super Swift, Great Britain Scout Cruiser laid down 1912 (Engine 1950)
Displacement:
2,225 t light; 2,291 t standard; 2,445 t normal; 2,568 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(380.73 ft / 378.00 ft) x 37.00 ft x (13.75 / 14.24 ft)
(116.05 m / 115.21 m) x 11.28 m x (4.19 / 4.34 m)
Armament:
6 - 4.00" / 102 mm 50.0 cal guns - 33.88lbs / 15.37kg shells, 150 per gun
Quick firing guns in deck and hoist mounts, 1912 Model
2 x Single mounts on centreline ends, evenly spread
4 x Single mounts on sides, forward deck aft
Weight of broadside 203 lbs / 92 kg
Main Torpedoes
2 - 18.0" / 457 mm, 21.00 ft / 6.40 m torpedoes - 0.905 t each, 1.810 t total
In 2 sets of deck mounted centre rotating tubes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 78,440 shp / 58,517 Kw = 37.00 kts
Range 3,750nm at 14.00 kts
Bunker at max displacement = 277 tons
Complement:
173 - 226
Cost:
£0.304 million / $1.216 million
Distribution of weights at normal displacement:
Armament: 66 tons, 2.7 %
- Guns: 62 tons, 2.6 %
- Weapons: 4 tons, 0.1 %
Armour: 37 tons, 1.5 %
- Armament: 37 tons, 1.5 %
Machinery: 1,460 tons, 59.7 %
Hull, fittings & equipment: 662 tons, 27.1 %
Fuel, ammunition & stores: 220 tons, 9.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
510 lbs / 232 Kg = 15.9 x 4.0 " / 102 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.31
Metacentric height 1.8 ft / 0.6 m
Roll period: 11.5 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.26
Seaboat quality (Average = 1.00): 1.02
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a round stern
Block coefficient (normal/deep): 0.445 / 0.451
Length to Beam Ratio: 10.22 : 1
'Natural speed' for length: 19.44 kts
Power going to wave formation at top speed: 71 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 16.00 %, 26.00 ft / 7.92 m, 24.00 ft / 7.32 m
- Forward deck: 18.00 %, 24.00 ft / 7.32 m, 24.00 ft / 7.32 m
- Aft deck: 51.00 %, 16.00 ft / 4.88 m, 16.00 ft / 4.88 m
- Quarter deck: 15.00 %, 16.00 ft / 4.88 m, 16.00 ft / 4.88 m
- Average freeboard: 18.85 ft / 5.74 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 200.6 %
- Above water (accommodation/working, high = better): 145.1 %
Waterplane Area: 8,885 Square feet or 825 Square metres
Displacement factor (Displacement / loading): 61 %
Structure weight / hull surface area: 34 lbs/sq ft or 167 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.42
- Longitudinal: 2.79
- Overall: 0.51
Extremely poor machinery, storage, compartmentation space
Excellent accommodation and workspace room
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.
Monday, May 12, 2008
I am a bit disappointed with the latest Springsharp beta
The latest Springsharp beta still does not allow me to have higher power output machinery. As far back as a 1905 design (HMS Swift), the British were able to achieve a 60 SHP/ton of machinery weight propulsion plant. Admittedly, that was with the machinery being stressed, but I do not believe overly so. I cannot find a way to do better than 50 SHP/ton and I believe that the power required is too great for the size of ship. All you have to do is consult a Conways and look at the British Tribal class destroyerss bujild from 1937 and later. For a nominal 44,000 SHP, the could reach a nominal speed of 36.25 to 36.5 knots. For a comparably-sized ship, Springsharp requires an absurd 78,440 SHP to reach 37 knots. This is the Springsharp report:
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