O1 , laid down 1939
O3 , laid down 1939
O5 , laid down 1939
O6 , laid down 1939
O7 , laid down 1939
O2 , laid down 1940
O4 , laid down 1940
O8 , laid down 1940
Drawing by Daidalos
Displacement:
1.175 t light; 1.215 t standard; 1.576 t normal; 1.864 t full load
Dimensions: Length overall / water x beam x draught
226,84 ft / 226,38 ft x 30,18 ft x 19,69 ft (normal load)
69,14 m / 69,00 m x 9,20 m x 6,00 m
Armament:
2 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1939 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 0,79" / 20,0 mm guns (1x2 guns), 0,24lbs / 0,11kg shells, 1939 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
Weight of broadside 71 lbs / 32 kg
Shells per gun, main battery: 200
8 - 21,0" / 533 mm submerged torpedo tubes
Armour:
- Armour deck: 0,79" / 20 mm, Conning tower: 1,97" / 50 mm
Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 4.691 shp / 3.500 Kw = 18,70 kts
Range 15.000nm at 12,00 kts
Bunker at max displacement = 649 tons
Complement:
124 - 162
Cost:
£0,386 million / $1,545 million
Distribution of weights at normal displacement:
Armament: 9 tons, 0,6%
Armour: 67 tons, 4,3%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 0 tons, 0,0%
- Armour Deck: 62 tons, 3,9%
- Conning Tower: 6 tons, 0,4%
Machinery: 127 tons, 8,1%
Hull, fittings & equipment: 722 tons, 45,8%
Fuel, ammunition & stores: 400 tons, 25,4%
Miscellaneous weights: 250 tons, 15,9%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
881 lbs / 400 Kg = 24,9 x 4,1 " / 105 mm shells or 0,6 torpedoes
Stability (Unstable if below 1.00): 1,11
Metacentric height 1,0 ft / 0,3 m
Roll period: 12,6 seconds
Steadiness - As gun platform (Average = 50 %): 3 %
- Recoil effect (Restricted arc if above 1.00): 0,00
Seaboat quality (Average = 1.00): 0,00
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,410
Length to Beam Ratio: 7,50 : 1
'Natural speed' for length: 15,05 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 25,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0,98 ft / 0,30 m
- Forecastle (20%): 0,33 ft / 0,10 m
- Mid (50%): 0,33 ft / 0,10 m
- Quarterdeck (15%): 0,33 ft / 0,10 m
- Stern: 0,33 ft / 0,10 m
- Average freeboard: 0,38 ft / 0,12 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96,5%
- Above water (accommodation/working, high = better): 2,1%
Waterplane Area: 4.232 Square feet or 393 Square metres
Displacement factor (Displacement / loading): 245%
Structure weight / hull surface area: 109 lbs/sq ft or 534 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2,53
- Longitudinal: 3,06
- Overall: 2,58
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is extremely poor
Ship has quick, lively roll, not a steady gun platform
Caution: Lacks seaworthiness - very limited seakeeping ability
Diving Depth: 80m
Emergency Depth: 125m
Crushing Depth: 200m