Ships in Class
RD61 though RD64 Layed down 1938
RD65 though RD69 Layed down 1941
Displacement:
404 t light; 419 t standard; 511 t normal; 585 t full load
Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
(205.50 ft / 196.85 ft) x 24.61 ft x (8.20 / 9.01 ft)
(62.64 m / 60.00 m) x 7.50 m x (2.50 / 2.75 m)
Armament:
1 - 2.99" / 76.0 mm 62.0 cal gun - 14.75lbs / 6.69kg shells, 300 per gun
Anti-air gun in deck and hoist mount, 1938 Model
1 x Single mount on centreline, forward deck forward
2 - 1.46" / 37.0 mm 54.0 cal guns - 1.66lbs / 0.75kg shells, 1,000 per gun
Anti-air guns in deck mounts, 1938 Model
2 x Single mounts on sides, aft deck centre
2 raised mounts
4 - 0.98" / 25.0 mm 45.0 cal guns - 0.48lbs / 0.22kg shells, 150 per gun
Anti-air guns in deck mounts, 1938 Model
4 x Single mounts on sides amidships
Weight of broadside 20 lbs / 9 kg
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
Machinery:
Diesel Internal combustion motors,
Electric cruising motors plus geared drives, 2 shafts, 4,000 shp / 2,984 Kw = 21.43 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 166 tons
Complement:
53 - 69
Cost:
£0.151 million / $0.603 million
Distribution of weights at normal displacement:
Armament: 7 tons, 1.5 %
Armour: 4 tons, 0.8 %
- Armament: 4 tons, 0.8 %
Machinery: 118 tons, 23.1 %
Hull, fittings & equipment: 234 tons, 45.9 %
Fuel, ammunition & stores: 107 tons, 20.9 %
Miscellaneous weights: 40 tons, 7.8 %
- Hull above water: 20 tons
- On freeboard deck: 20 tons
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
950 lbs / 431 Kg = 70.9 x 3.0 " / 76 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 0.9 ft / 0.3 m
Roll period: 10.8 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.08
Seaboat quality (Average = 1.00): 1.29
Hull form characteristics:
Hull has a flush deck,
a normal bow and large transom stern
Block coefficient (normal/deep): 0.450 / 0.469
Length to Beam Ratio: 8.00 : 1
'Natural speed' for length: 16.42 kts
Power going to wave formation at top speed: 63 %
Trim (Max stability = 0, Max steadiness = 100): 39
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = length of deck as a percentage of waterline length):
Fore end, Aft end
- Forecastle: 15.00 %, 14.76 ft / 4.50 m, 11.48 ft / 3.50 m
- Forward deck: 30.00 %, 11.48 ft / 3.50 m, 9.84 ft / 3.00 m
- Aft deck: 40.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Quarter deck: 15.00 %, 9.84 ft / 3.00 m, 9.84 ft / 3.00 m
- Average freeboard: 10.53 ft / 3.21 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.9 %
- Above water (accommodation/working, high = better): 117.6 %
Waterplane Area: 3,209 Square feet or 298 Square metres
Displacement factor (Displacement / loading): 168 %
Structure weight / hull surface area: 40 lbs/sq ft or 194 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 4.75
- Overall: 1.15
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily
40tons minesweeping gear
Originaly by Red Admiral.