Amazon Ad

Thursday, November 17, 2005

A more satisfactory high-speed scout

Springsharp let me achieve a better high-speed scout by going to a smaller displacement. That way, I was able to get a 38 knot maximum speed with a 15 knot cruising speed. The armament is 6-13cm DP guns, 8-57mm AA, and 12-40mm AA guns with 8-21in TT. There is no protection. This allows a better ship to be designed on a normal displacement of 3,450 tons. This is more of a super destroyer, which was what was intended, anyway. This is the Springsharp report:
GB/CL/1927, Great Britain Scout Cruiser laid down 1927 (Engine 1950)

Displacement:
 3,093 t light; 3,204 t standard; 3,450 t normal; 3,647 t full load

Dimensions: Length overall / water x beam x draught
 440.36 ft / 435.00 ft x 41.00 ft x 16.00 ft (normal load)
 134.22 m / 132.59 m x 12.50 m  x 4.88 m

Armament:
      6 - 5.10" / 130 mm guns (3x2 guns), 66.33lbs / 30.08kg shells, 1927 Model
   Dual purpose guns in deck mounts with hoists
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      12 - 1.57" / 40.0 mm guns (6x2 guns), 1.95lbs / 0.89kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 4 raised mounts
 Weight of broadside 467 lbs / 212 kg
 Shells per gun, main battery: 150
 8 - 21.0" / 533.4 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 98,493 shp / 73,476 Kw = 38.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 443 tons

Complement:
 224 - 292

Cost:
 £1.629 million / $6.518 million

Distribution of weights at normal displacement:
 Armament: 58 tons, 1.7 %
 Machinery: 2,077 tons, 60.2 %
 Hull, fittings & equipment: 957 tons, 27.7 %
 Fuel, ammunition & stores: 357 tons, 10.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   676 lbs / 307 Kg = 10.2 x 5.1 " / 130 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.50
 Metacentric height 2.6 ft / 0.8 m
 Roll period: 10.6 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.37
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has raised forecastle, rise forward of midbreak
 Block coefficient: 0.423
 Length to Beam Ratio: 10.61 : 1
 'Natural speed' for length: 20.86 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  27.00 ft / 8.23 m
    - Forecastle (20 %): 23.00 ft / 7.01 m (21.00 ft / 6.40 m aft of break)
    - Mid (50 %):  19.00 ft / 5.79 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 18.77 ft / 5.72 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 207.1 %
  - Above water (accommodation/working, high = better): 116.8 %
 Waterplane Area: 11,144 Square feet or 1,035 Square metres
 Displacement factor (Displacement / loading): 67 %
 Structure weight / hull surface area: 40 lbs/sq ft or 198 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.45
  - Longitudinal: 2.01
  - Overall: 0.52
 Hull space for machinery, storage, compartmentation is extremely poor
 Room for accommodation and workspaces is adequate

No comments:

Amazon Context Links