Atlantis would like to submit its initial design.
Orzel, Polish Submarine (Atlantean design) laid down 1930
Displacement:
936 t light; 966 t standard; 1,083 t normal; 1,176 t full load
Dimensions: Length overall / water x beam x draught
220.00 ft / 220.00 ft x 24.00 ft x 14.50 ft (normal load)
67.06 m / 67.06 m x 7.32 m x 4.42 m
Armament:
2 - 4.50" / 114 mm guns in single mounts, 45.56lbs / 20.67kg shells, 1930 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread
2 - 1.57" / 39.9 mm guns in single mounts, 1.93lbs / 0.88kg shells, 1930 Model
Anti-aircraft guns in deck mounts
on centreline, all amidships, all raised mounts - superfiring
2 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1930 Model
Machine guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 95 lbs / 43 kg
Shells per gun, main battery: 150
6 - 21.0" / 533.4 mm submerged torpedo tubes 4 forward, 2 aft, 12 reloads
Armour:
- Conning tower: 1.38" / 35 mm
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,040 shp / 1,522 Kw = 16.00 kts
Range 5,500nm at 12.00 kts
Bunker at max displacement = 210 tons
Complement:
93 - 122
Cost:
£0.215 million / $0.860 million
Distribution of weights at normal displacement:
Armament: 12 tons, 1.1 %
Armour: 3 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 3 tons, 0.3 %
Machinery: 62 tons, 5.7 %
Hull, fittings & equipment: 635 tons, 58.7 %
Fuel, ammunition & stores: 146 tons, 13.5 %
Miscellaneous weights: 224 tons, 20.7 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
576 lbs / 261 Kg = 12.6 x 4.5 " / 114 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 0.7 ft / 0.2 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 0 %
- 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: 0.495
Length to Beam Ratio: 9.17 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 0.00 ft / 0.00 m
- Forecastle (20 %): 0.00 ft / 0.00 m
- Mid (50 %): 0.00 ft / 0.00 m
- Quarterdeck (15 %): 0.00 ft / 0.00 m
- Stern: 0.00 ft / 0.00 m
- Average freeboard: 0.00 ft / 0.00 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 96.9 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 3,502 Square feet or 325 Square metres
Displacement factor (Displacement / loading): 243 %
Structure weight / hull surface area: 123 lbs/sq ft or 602 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.49
- Longitudinal: 2.12
- Overall: 2.40
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
Operational depth 240 feet
Emergency depth 384 feet
Crush depth 600 feet