Hi I have been trying to sim a S class DD (1917) with springsharp can anybody help as not sure if I can get it better ?
thanks JSB
S class , GB DD laid down 1917
DESIGN FAILURE: Overall load weight too much for hull
Displacement:
777 t light; 809 t standard; 1,045 t normal; 1,234 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(275.59 ft / 271.31 ft) x 26.67 ft x (8.86 / 10.14 ft)
(84.00 m / 82.70 m) x 8.13 m x (2.70 / 3.09 m)
Armament:
3 - 4.00" / 102 mm 40.0 cal guns - 31.00lbs / 14.06kg shells, 200 per gun
Quick firing guns in deck mounts, 1911 Model
3 x Single mounts on centreline, evenly spread
1 - 1.57" / 40.0 mm 39.0 cal gun - 2.01lbs / 0.91kg shells, 500 per gun
Anti-air gun in deck mount, 1915 Model
1 x Single mount on centreline aft
Weight of broadside 95 lbs / 43 kg
Main Torpedoes
4 - 21.0" / 533 mm, 18.00 ft / 5.49 m torpedoes - 1.173 t each, 4.690 t total
In 2 sets of deck mounted centre rotating tubes
Main DC/AS Mortars
2 - 300.00 lbs / 136.08 kg Depth Charges + 20 reloads - 2.946 t total
in Stern depth charge racks
2nd DC/AS Mortars
2 - 300.00 lbs / 136.08 kg Depth Charges + 10 reloads - 1.607 t total
in Depth charge throwers
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.50" / 13 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 27,000 shp / 20,142 Kw = 30.71 kts
Range 5,500nm at 15.00 kts
Bunker at max displacement = 425 tons
Complement:
91 - 119
Cost:
£0.205 million / $0.821 million
Distribution of weights at normal displacement:
Armament: 31 tons, 2.9 %
- Guns: 15 tons, 1.4 %
- Weapons: 15 tons, 1.5 %
Armour: 4 tons, 0.3 %
- Armament: 4 tons, 0.3 %
Machinery: 583 tons, 55.8 %
Hull, fittings & equipment: 140 tons, 13.4 %
Fuel, ammunition & stores: 268 tons, 25.6 %
Miscellaneous weights: 20 tons, 1.9 %
- On freeboard deck: 20 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
182 lbs / 83 Kg = 5.7 x 4.0 " / 102 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.83
Metacentric height 1.8 ft / 0.6 m
Roll period: 8.3 seconds
Steadiness - As gun platform (Average = 50 %): 49 %
- Recoil effect (Restricted arc if above 1.00): 0.11
Seaboat quality (Average = 1.00): 0.97
Hull form characteristics:
Hull has rise forward of midbreak,
a normal bow and a cruiser stern
Block coefficient (normal/deep): 0.571 / 0.588
Length to Beam Ratio: 10.17 : 1
'Natural speed' for length: 16.47 kts
Power going to wave formation at top speed: 73 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 11.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 17.00 %, 22.00 ft / 6.71 m, 18.00 ft / 5.49 m
- Forward deck: 21.00 %, 18.00 ft / 5.49 m, 17.00 ft / 5.18 m
- Aft deck: 41.00 %, 11.00 ft / 3.35 m, 10.80 ft / 3.29 m
- Quarter deck: 21.00 %, 10.80 ft / 3.29 m, 10.80 ft / 3.29 m
- Average freeboard: 13.74 ft / 4.19 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 184.3 %
- Above water (accommodation/working, high = better): 114.5 %
Waterplane Area: 5,149 Square feet or 478 Square metres
Displacement factor (Displacement / loading): 51 %
Structure weight / hull surface area: 14 lbs/sq ft or 66 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.26
- Longitudinal: 1.49
- Overall: 0.31
Cramped machinery, storage, compartmentation space
Adequate accommodation and workspace room
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather
- Hull strength ? what should it be ? 25% 50% 100% ? (for a WW1 DD)
- Speed v power doesn't match OTL by 6Kn top speed if at OTL power.
- must be other problems
