I don´t understand why there is an armored conning tower on the DD....?!
Neither do I!?!?!?!?!?!
Design Revised, with even better Seakeeping
31 class, Nordmark Destroyers laid down 1931
Displacement:
1,797 t light; 1,879 t standard; 2,166 t normal; 2,396 t full load
Dimensions: Length overall / water x beam x draught
365.36 ft / 360.00 ft x 36.00 ft x 13.00 ft (normal load)
111.36 m / 109.73 m x 10.97 m x 3.96 m
Armament:
8 - 4.33" / 110 mm guns (4x2 guns), 40.61lbs / 18.42kg shells, 1931 Model
Dual purpose guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1.46" / 37.0 mm guns (4x2 guns), 1.55lbs / 0.70kg shells, 1931 Model
Anti-aircraft guns in deck mounts
on side, all amidships
8 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1931 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 339 lbs / 154 kg
Shells per gun, main battery: 200
6 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 1.00" / 25 mm -
2nd: 1.00" / 25 mm - -
3rd: 1.00" / 25 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 38,369 shp / 28,623 Kw = 33.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 517 tons
Complement:
158 - 206
Cost:
£1.046 million / $4.184 million
Distribution of weights at normal displacement:
Armament: 42 tons, 2.0 %
Armour: 26 tons, 1.2 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 26 tons, 1.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,008 tons, 46.6 %
Hull, fittings & equipment: 660 tons, 30.5 %
Fuel, ammunition & stores: 369 tons, 17.0 %
Miscellaneous weights: 60 tons, 2.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
712 lbs / 323 Kg = 17.5 x 4.3 " / 110 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.29
Metacentric height 1.7 ft / 0.5 m
Roll period: 11.6 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.51
Seaboat quality (Average = 1.00): 1.12
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 10.00 : 1
'Natural speed' for length: 21.79 kts
Power going to wave formation at top speed: 68 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (30 %): 20.00 ft / 6.10 m
- Mid (50 %): 20.00 ft / 6.10 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 17.00 ft / 5.18 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 168.9 %
- Above water (accommodation/working, high = better): 114.1 %
Waterplane Area: 8,587 Square feet or 798 Square metres
Displacement factor (Displacement / loading): 80 %
Structure weight / hull surface area: 37 lbs/sq ft or 182 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.43
- Overall: 0.58
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
31-1 to 6 built