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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:
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

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