Thornycraft DL rebuild

Dear visitor, welcome to WesWorld. If this is your first visit here, please read the Help. It explains in detail how this page works. To use all features of this page, you should consider registering. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

Desertfox

Ambitious Packrat

Posts: 4,058

Sunday, April 16th 2006, 10:50pm

Thornycraft DL rebuild

Instead of the Cambrian rebuild Im going with this one. The pair of DLs will be downgraded from Class A destroyers to Class B.

HMAS Spencer, Australia Destroyer laid down 1917 (Engine 1931)

Displacement:
1,552 t light; 1,628 t standard; 1,887 t normal; 2,094 t full load

Dimensions: Length overall / water x beam x draught
322.10 ft / 320.00 ft x 31.75 ft x 13.00 ft (normal load)
98.18 m / 97.54 m x 9.68 m x 3.96 m

Armament:
5 - 4.72" / 120 mm guns in single mounts, 52.58lbs / 23.85kg shells, 1930 Model
Dual purpose guns in deck mounts
on centreline, evenly spread, 2 raised mounts
4 - 1.57" / 40.0 mm guns (1x4 guns), 1.95lbs / 0.88kg shells, 1930 Model
Anti-aircraft guns in deck mount
on centreline amidships
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 273 lbs / 124 kg
Shells per gun, main battery: 250
8 - 21.0" / 533.4 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 46,544 shp / 34,722 Kw = 33.00 kts
Range 5,400nm at 15.00 kts
Bunker at max displacement = 465 tons

Complement:
143 - 186

Cost:
£0.413 million / $1.651 million

Distribution of weights at normal displacement:
Armament: 34 tons, 1.8 %
Machinery: 1,029 tons, 54.5 %
Hull, fittings & equipment: 479 tons, 25.4 %
Fuel, ammunition & stores: 335 tons, 17.8 %
Miscellaneous weights: 10 tons, 0.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
396 lbs / 179 Kg = 7.5 x 4.7 " / 120 mm shells or 0.2 torpedoes
Stability (Unstable if below 1.00): 1.28
Metacentric height 1.4 ft / 0.4 m
Roll period: 11.3 seconds
Steadiness - As gun platform (Average = 50 %): 71 %
- Recoil effect (Restricted arc if above 1.00): 0.31
Seaboat quality (Average = 1.00): 1.12

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.500
Length to Beam Ratio: 10.08 : 1
'Natural speed' for length: 17.89 kts
Power going to wave formation at top speed: 72 %
Trim (Max stability = 0, Max steadiness = 100): 63
Bow angle (Positive = bow angles forward): 5.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24.00 ft / 7.32 m
- Forecastle (30 %): 24.00 ft / 7.32 m (14.00 ft / 4.27 m aft of break)
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 17.00 ft / 5.18 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 191.2 %
- Above water (accommodation/working, high = better): 57.7 %
Waterplane Area: 6,769 Square feet or 629 Square metres
Displacement factor (Displacement / loading): 62 %
Structure weight / hull surface area: 29 lbs/sq ft or 144 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.45
- Longitudinal: 3.40
- Overall: 0.56
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform