Originally posted by Commodore Green
Last design.....YES - NO - MAYBE???????
Well how does she fair against her closest neighbours recent design?
R-62 class sub, Atlantis Coastal submarine laid down 1925
Displacement:
410 t light; 421 t standard; 438 t normal; 451 t full load
Dimensions: Length overall / water x beam x draught
135.01 ft / 135.00 ft x 15.00 ft (Bulges 22.00 ft) x 12.00 ft (normal load)
41.15 m / 41.15 m x 4.57 m (Bulges 6.71 m) x 3.66 m
Armament:
2 - 2.95" / 74.9 mm guns in single mounts, 12.84lbs / 5.82kg shells, 1925 Model
Breech loading guns in deck mounts
on centreline, evenly spread
2 - 1.00" / 25.4 mm guns (1x2 guns), 0.50lbs / 0.23kg shells, 1925 Model
Breech loading guns in deck mount
on centreline
Weight of broadside 27 lbs / 12 kg
Shells per gun, main battery: 150
3 - 21.0" / 533.4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 1,102 shp / 822 Kw = 15.00 kts
Range 6,000nm at 6.00 kts
Bunker at max displacement = 31 tons
Complement:
47 - 62
Cost:
£0.072 million / $0.290 million
Distribution of weights at normal displacement:
Armament: 3 tons, 0.8 %
Machinery: 36 tons, 8.2 %
Hull, fittings & equipment: 291 tons, 66.4 %
Fuel, ammunition & stores: 28 tons, 6.4 %
Miscellaneous weights: 80 tons, 18.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
261 lbs / 118 Kg = 20.3 x 3.0 " / 75 mm shells or 0.4 torpedoes
Stability (Unstable if below 1.00): 1.20
Metacentric height 0.4 ft / 0.1 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 1 %
- 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: 0.430
Length to Beam Ratio: 6.14 : 1
'Natural speed' for length: 11.62 kts
Power going to wave formation at top speed: 58 %
Trim (Max stability = 0, Max steadiness = 100): 50
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: 0.10 ft / 0.03 m
- Forecastle (30 %): 0.10 ft / 0.03 m
- Mid (0 %): 0.10 ft / 0.03 m
- Quarterdeck (55 %): 0.10 ft / 0.03 m
- Stern: 0.10 ft / 0.03 m
- Average freeboard: 0.10 ft / 0.03 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 92.7 %
- Above water (accommodation/working, high = better): 0.5 %
Waterplane Area: 1,272 Square feet or 118 Square metres
Displacement factor (Displacement / loading): 246 %
Structure weight / hull surface area: 122 lbs/sq ft or 596 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 4.25
- Longitudinal: 4.53
- Overall: 4.28
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
operational diving depth: 428 feet
Emergency diving depth: 684 feet
Crush depth: 1070 feet