Twelve subs of the D-22 class were laid down as the first treaty designed submarines in the Atlantean navy, an additional four units were laid down, three for foreign navies and a forth as a test bed for new submarine technology. In the 40's the subs were considered short legged in terms of range when compared to the newer R-98 class subs and plans were made to refit them to fill a new role and increase their range. The now named Dolphin class were refitted to serve as Radar picket subs with emphasis on making the ships as quiet as possible with streamlining and other measures. Given their new role dive depth was not considered an issue. The original armament, her stern torpedo tubes and conning tower were removed. They had a new more streamlined conning tower added along with new sonar and Radar and a new armament consisting of 1x75mm, 1x40mm AA and 4 50 cal. MG's. Their range was increased and new diesel engines added. Their refit cost 507 tons each. (trim altered and bow form altered for new sonar)
As refitted in 1945
Dolphin (D-22 class), Atlantean Fleet sub laid down 1930 (Engine 1945)
Displacement:
1,056 t light; 1,081 t standard; 1,157 t normal; 1,219 t full load
Dimensions: Length overall / water x beam x draught
219.00 ft / 219.00 ft x 24.50 ft x 15.10 ft (normal load)
66.75 m / 66.75 m x 7.47 m x 4.60 m
Armament:
1 - 2.95" / 75.0 mm guns in single mounts, 12.87lbs / 5.84kg shells, 1930 Model
Quick firing gun in deck mount
on centreline aft
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1930 Model
Anti-aircraft gun in deck mount
on centreline aft
4 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1930 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 15 lbs / 7 kg
Shells per gun, main battery: 150
4 - 21.0" / 533.4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 4,500 shp / 3,357 Kw = 19.33 kts
Range 6,000nm at 10.00 kts
Bunker at max displacement = 138 tons
Complement:
98 - 128
Cost:
£0.228 million / $0.911 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.2 %
Machinery: 114 tons, 9.8 %
Hull, fittings & equipment: 641 tons, 55.4 %
Fuel, ammunition & stores: 101 tons, 8.7 %
Miscellaneous weights: 300 tons, 25.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
643 lbs / 292 Kg = 49.9 x 3.0 " / 75 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.01
Metacentric height 0.6 ft / 0.2 m
Roll period: 13.0 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: 0.500
Length to Beam Ratio: 8.94 : 1
'Natural speed' for length: 14.80 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 42
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): 90.7 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 3,575 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 213 %
Structure weight / hull surface area: 121 lbs/sq ft or 590 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.61
- Longitudinal: 2.23
- Overall: 2.52
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
Misc. weight breakdown
200 tons for ballast
60 tons for sonar, hydrophones and radar's
18 tons for 12 torpedo reloads
10 tons for snorkel (rostrum)
8 tons for "Placidus" system
4 tons for Fallax system
Original configuration
D-22 through 33, 12 boats
Type:fleet subs
An additional 4 built for a foreign buyer but deal did not go through, 1 taken in hand for conversion to experimental platform, other three sold, 1 to Mexico and 2 to Chile
Renamed and new Pennant numbers assigned in 1944, Dolphin (SSF-1) ex-D-22, Shark (SSF-2) ex-D-23, Bullhead (SSF-3) ex-D-24, Stickleback (SSF-4) ex-D-25, Marlin (SSF-5) ex-D-26, Barracuda (SSF-6) ex-D27, Pike (SSF-7) ex-D-28, Thresher (SSF-8) ex-D-29, Hammerhead (SSF-9) ex-D-30, Spearfish (SSF-10) ex-D-31, Salmon (SSF-11) ex-D-32, Swordfish (SSF-12) ex-D-33
Atlantean Submarine laid down 1930
Displacement:
1,013 t light; 1,042 t standard; 1,157 t normal; 1,250 t full load
Dimensions: Length overall / water x beam x draught
219.00 ft / 219.00 ft x 24.50 ft x 15.10 ft (normal load)
66.75 m / 66.75 m x 7.47 m x 4.60 m
Armament:
2 - 3.95" / 100 mm guns in single mounts, 30.81lbs / 13.98kg shells, 1930 Model
Breech loading guns in deck mounts
on centreline, evenly spread
1 - 1.58" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1930 Model
Anti-aircraft gun in deck mount
on centreline aft, 1 raised gun
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Anti-aircraft guns in deck mount
on centreline amidships, all raised guns - superfiring
4 - 0.50" / 12.7 mm guns (2x2 guns), 0.06lbs / 0.03kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 64 lbs / 29 kg
Shells per gun, main battery: 150
6 - 21.0" / 533.4 mm submerged torpedo tubes
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 2,729 shp / 2,036 Kw = 17.05 kts
Range 5,200nm at 12.00 kts
Bunker at max displacement = 208 tons
Complement:
98 - 128
Cost:
£0.225 million / $0.900 million
Distribution of weights at normal displacement:
Armament: 8 tons, 0.7 %
Machinery: 83 tons, 7.1 %
Hull, fittings & equipment: 702 tons, 60.7 %
Fuel, ammunition & stores: 144 tons, 12.5 %
Miscellaneous weights: 220 tons, 19.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
646 lbs / 293 Kg = 21.0 x 4.0 " / 100 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.8 ft / 0.2 m
Roll period: 11.8 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: 0.500
Length to Beam Ratio: 8.94 : 1
'Natural speed' for length: 14.80 kts
Power going to wave formation at top speed: 49 %
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): 95.0 %
- Above water (accommodation/working, high = better): 0.0 %
Waterplane Area: 3,575 Square feet or 332 Square metres
Displacement factor (Displacement / loading): 257 %
Structure weight / hull surface area: 132 lbs/sq ft or 647 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 3.93
- Longitudinal: 2.44
- Overall: 2.75
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
200 tons for ballast
20 tons for 12 reload torpedo's
Operational depth 275 feet (82.5 metres)
Emergency depth 440 feet (132 metres)
Crush depth 687.5 feet (206.25 metres)