Seelöwe, German Coastal Escort laid down 1946
Displacement: 481 t light; 527 t standard; 610 t normal; 677 t full load
Dimensions: Length overall / water x beam x draught
239.07 ft / 229.66 ft x 24.93 ft x 7.38 ft (normal load) [72.87 m / 70.00 m x 7.60 m x 2.25 m]
Armament:
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1945 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1940 Model Anti-aircraft guns in deck mounts on side, all amidships
Weight of broadside 22 lbs / 10 kg
Shells per gun, main battery: 2,400
Armour:
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.59" / 15 mm -
2nd: 0.39" / 10 mm - -
Conning tower: 0.98" / 25 mm
Machinery:
Diesel Internal combustion engines plus batteries,
Electric cruising motors plus geared drives, 2 shafts, 4,246 shp / 3,168 Kw = 22.00 kts
Range 4,100nm at 15.00 kts
Bunker at max displacement = 150 tons
Complement: 60 - 79
Cost: £0.241 million / $0.965 million
Distribution of weights at normal displacement:
Armament: 3 tons, 0.5 %
Armour: 5 tons, 0.9 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 0.6 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.3 %
Machinery: 106 tons, 17.4 %
Hull, fittings & equipment: 277 tons, 45.4 %
Fuel, ammunition & stores: 129 tons, 21.1 %
Miscellaneous weights: 90 tons, 14.8 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 1,242 lbs / 564 Kg = 244.7 x 2.2 " / 55 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 0.8 ft / 0.2 m
Roll period: 12.1 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.90
Hull form characteristics:
Hull has a flush deck and transom stern
Block coefficient: 0.505
Length to Beam Ratio: 9.21: 1
'Natural speed' for length: 17.40 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 37
Bow angle (Positive = bow angles forward): 18.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.86 ft / 5.75 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (50 %): 9.84 ft / 3.00 m
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 12.78 ft / 3.90 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 82.2 %
- Above water (accommodation/working, high = better): 148.5 %
Waterplane Area: 3,986 Square feet or 370 Square metres
Displacement factor (Displacement / loading): 185 %
Structure weight / hull surface area: 33 lbs/sq ft or 161 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.34
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Breakdown of Miscellaneous Weight
Navigational radar - 15 tons
Search and gun direction radar - 15 tons
Sonar and A/S detection gear - 20 tons
Ahead throwing AS weapon - 10 tons
Depth charge racks and mortars - 20 tons
Reserved for future growth - 10 tons
Seelöwe – Laid down 1 January 1946; Launched 24 February 1946; Completed 16 May 1946
Seeigel – Laid down 1 January 1946; Launched 24 February 1946; Completed 16 May 1946
Seehund - Laid down 1 April 1946; Launched 25 May 1946; Completed 14 August 1946
Seepferd - Laid down 1 April 1946; Launched 25 May 1946; Completed 14 August 1946