WesWorld

Repository for data pertaining to antisubmarine escort vessels

Jagd, German Corvette laid down 1937

Displacement: 1,097 t light; 1,144 t standard; 1,351 t normal; 1,516 t full load

Dimensions: Length overall / water x beam x draught

291.88 ft / 278.87 ft x 34.45 ft x 9.84 ft (normal load) [88.96 m / 85.00 m x 10.50 m x 3.00 m]

Armament:

4 - 4.13" / 105 mm guns (2x2 guns), 35.32lbs / 16.02kg shells, 1928 Model Dual purpose guns in deck mounts on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1937 Model Anti-aircraft guns in deck mount on centreline forward, all raised guns
8 - 0.79" / 20.0 mm guns (2x4 guns), 0.24lbs / 0.11kg shells, 1937 Model Anti-aircraft guns in deck mounts on side, all amidships, all raised mounts - superfiring
Weight of broadside 146 lbs / 66 kg
Shells per gun, main battery: 240

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.18" / 30 mm 0.79" / 20 mm -
2nd: 0.79" / 20 mm 0.79" / 20 mm -
3rd: 0.39" / 10 mm - -

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 10,767 shp / 8,032 Kw = 25.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 372 tons

Complement: 110 - 144

Cost: £0.521 million / $2.085 million

Distribution of weights at normal displacement:

Armament: 18 tons, 1.4 %
Armour: 11 tons, 0.8 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 11 tons, 0.8 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 298 tons, 22.1 %
Hull, fittings & equipment: 609 tons, 45.1 %
Fuel, ammunition & stores: 254 tons, 18.8 %
Miscellaneous weights: 160 tons, 11.8 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,479 lbs / 1,125 Kg = 70.2 x 4.1 " / 105 mm shells or 0.8 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 1.2 ft / 0.4 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 73 %
- Recoil effect (Restricted arc if above 1.00): 0.18
Seaboat quality (Average = 1.00): 1.52

Hull form characteristics:

Hull has rise forward of midbreak and transom stern
Block coefficient: 0.500
Length to Beam Ratio: 8.10: 1
'Natural speed' for length: 19.39 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 48
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 1.64 ft / 0.50 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (20 %): 17.22 ft / 5.25 m
- Mid (80 %): 17.22 ft / 5.25 m (9.84 ft / 3.00 m aft of break)
- Quarterdeck (15 %): 9.84 ft / 3.00 m
- Stern: 9.84 ft / 3.00 m
- Average freeboard: 15.94 ft / 4.86 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 96.0 %
- Above water (accommodation/working, high = better): 192.0 %
Waterplane Area: 6,656 Square feet or 618 Square metres
Displacement factor (Displacement / loading): 148 %
Structure weight / hull surface area: 48 lbs/sq ft or 234 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
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

Sonar - 20 tons
Radar - 10 tons
AS Outfit - 40 tons (AS Mortars, DC rails, DC)
AS Standoff Weapon - 20 tons
Helicopter - 50 tons
Growth - 20 tons

Changes - helicopter facilities expanded; AS standoff weapon fitted

Level II Minor Refit - Cost 5% (for vessels less than 2,999 tons light) - 55 tons; Time to complete - 16 days


Converted from F7-class fleet escorts

Jagd (ex F7) – Conversion commenced 1 Jan 1943; complete 17 Jan 1943
Wacht (ex F8) – Conversion commenced 1 Jan 1943; complete 17 Jan 1943
Blitz (ex F9) - Conversion commenced 1 April 1943; complete 17 April 1943
Pfeil (ex F10) - Conversion commenced 1 April 1943; complete 17 April 1943
Gefion (ex F11) - Conversion commenced 1 Jul 1943; complete 17 Jul 1943
Hela (ex F12) - Conversion commenced 1 Jul 1943; complete 17 Jul 1943
Schwalbe (ex F13) - Conversion commenced 1 Jul 1943; complete 17 Jul 1943
Sperber (ex F14) - Conversion commenced 1 Jul 1943; complete 17 Jul 1943

Leopard, German Corvette laid down 1943

Displacement: 1,000 t light; 1,062 t standard; 1,299 t normal; 1,488 t full load

Dimensions: Length overall / water x beam x draught

301.22 ft / 288.71 ft x 31.17 ft x 10.17 ft (normal load) [91.81 m / 88.00 m x 9.50 m x 3.10 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1943 Model Dual purpose guns in a deck mount with hoist on centreline forward
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1943 Model Anti-aircraft guns in deck mounts on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 77 lbs / 35 kg
Shells per gun, main battery: 800

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm 0.39" / 10 mm -

Conning tower: 0.79" / 20 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 14,013 shp / 10,454 Kw = 27.00 kts
Range 7,500nm at 15.00 kts
Bunker at max displacement = 426 tons

Complement: 107 - 140

Cost: £0.614 million / $2.455 million

Distribution of weights at normal displacement:

Armament: 10 tons, 0.7 %
Armour: 7 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 362 tons, 27.9 %
Hull, fittings & equipment: 521 tons, 40.1 %
Fuel, ammunition & stores: 299 tons, 23.0 %
Miscellaneous weights: 100 tons, 7.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,622 lbs / 736 Kg = 45.9 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 1.2 ft / 0.4 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.17
Seaboat quality (Average = 1.00): 1.26

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak and transom stern
Block coefficient: 0.497
Length to Beam Ratio: 9.26 : 1
'Natural speed' for length: 19.52 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 47
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.65 ft / 6.60 m
- Forecastle (20 %): 18.37 ft / 5.60 m (17.39 ft / 5.30 m aft of break)
- Mid (50 %): 17.06 ft / 5.20 m (10.50 ft / 3.20 m aft of break)
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 14.35 ft / 4.38 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 107.3 %
- Above water (accommodation/working, high = better): 150.5 %
Waterplane Area: 6,216 Square feet or 578 Square metres
Displacement factor (Displacement / loading): 143 %
Structure weight / hull surface area: 43 lbs/sq ft or 210 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.79
- Longitudinal: 3.61
- Overall: 0.92
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Reserved for air and surface warning radar - 15 tons
Reserved for fire control and director radars - 15 tons
Reserved for sonar - 20 tons
Reserved for stand-off antisubmarine weapon - 20 tons
Reserved for ahead-thrown antisubmarine weapon - 10 tons
Reserved for A/S outfit - two depth charge racks, 48 depth charges - 20 tons

Edit: Due to delays in development, the projected ahead-thrown antisubmarine weapon has not yet been fitted in this class.

Leopard – Laid down 1 Jan 1943; Launched 3 May 1943; Completed 28 Oct 1943
Luchs – Laid down 1 Jan 1943; Launched 3 May 1943; Completed 28 Oct 1943
Fuchs – Laid down 1 Jan 1943; Launched 3 May 1943; Completed 28 Oct 1943
Wolf – Laid down 1 Jan 1943; Launched 3 May 1943; Completed 28 Oct 1943
Jaguar - Laid down 1 April 1943; Launched 1 Aug 1943; Completed 26 Jan 1944
Tiger - Laid down 1 April 1943; Launched 1 Aug 1943; Completed 26 Jan 1944
Iltis - Laid down 1 April 1943; Launched 1 Aug 1943; Completed 26 Jan 1944
Lowe - Laid down 1 April 143; Launched 1 Aug 1943; Completed 26 Jan 1944
Dachs - Laid down 1 Oct 1943; Launched 31 Jan 1944; Completed 27 July 1944
Frettchen - Laid down 1 Oct 1943; Launched 31 Jan 1944; Completed 27 July 1944
Gepard - Laid down 1 Oct 1943; Launched 31 Jan 1944; Completed 27 July 1944
Hyäne - Laid down 1 Oct 1943; Launched 31 Jan 1944; Completed 27 July 1944
Nerz - Laid down 1 Mar 1944; Launched 1 July 1944; Completed 26 December 1944
Ozelot - Laid down 1 Mar 1944; Launched 1 July 1944; Completed 26 December 1944
Puma - Laid down 1 Mar 1944; Launched 1 July 1944; Completed 26 December 1944
Wiesel - Laid down 1 Mar 1944; Launched 1 July 1944; Completed 26 December 1944

Albatros, German Corvette laid down 1945

Displacement: 1,000 t light; 1,059 t standard; 1,273 t normal; 1,445 t full load

Dimensions: Length overall / water x beam x draught

298.87 ft / 288.71 ft x 31.17 ft x 10.17 ft (normal load) [91.09 m / 88.00 m x 9.50 m x 3.10 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1945 Model Dual purpose guns in a deck mount with hoist on centreline forward
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1945 Model Anti-aircraft guns in deck mounts on centreline, all aft, 1 raised mount - superfiring
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1945 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 91 lbs / 41 kg
Shells per gun, main battery: 600

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm 0.39" / 10 mm -

Conning tower: 0.79" / 20 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 13,752 shp / 10,259 Kw = 27.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 386 tons

Complement: 106 - 138

Cost: £0.644 million / $2.576 million

Distribution of weights at normal displacement:

Armament: 11 tons, 0.9 %
Armour: 7 tons, 0.6 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 347 tons, 27.3 %
Hull, fittings & equipment: 523 tons, 41.1 %
Fuel, ammunition & stores: 274 tons, 21.5 %
Miscellaneous weights: 110 tons, 8.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,581 lbs / 717 Kg = 44.8 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.6 seconds
Steadiness - As gun platform (Average = 50 %): 69 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.36

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.487
Length to Beam Ratio: 9.26: 1
'Natural speed' for length: 19.54 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.82 ft / 0.25 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.01 ft / 6.10 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 15.42 ft / 4.70 m
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 14.81 ft / 4.51 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 107.3 %
- Above water (accommodation/working, high = better): 161.9 %
Waterplane Area: 6,160 Square feet or 572 Square metres
Displacement factor (Displacement / loading): 141 %
Structure weight / hull surface area: 42 lbs/sq ft or 206 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.76
- Longitudinal: 4.01
- Overall: 0.89
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Air and surface warning radar - 20 tons
Fire control and director radars - 20 tons
Sonar - 20 tons
Stand-off antisubmarine weapon - 30 tons
A/S outfit - two depth charge racks, 48 depth charges - 20 tons


Albatros - Laid down 1 January 1945; Launched 3 May 1945; Completed 28 October 1945
Mowe - Laid down 1 January 1945; Launched 3 May 1945; Completed 28 October 1945
Bussard - Laid down 1 April 1945; Launched 1 August 1945; Completed 26 January 1946
Grief - Laid down 1 April 1945; Launched 1 August 1945; Completed 26 January 1946
Drache - Laid down 1 July 1945; Launched 31 October 1945; Completed 27 April 1946
Kormoran - Laid down 1 July 1945; Launched 31 October 1945; Completed 27 April 1946
Falke - Laid down 1 October 1945; Launched 31 January 1946; Completed 28 July 1946
Kondor - Laid down 1 October 1945; Launched 31 January 1946; Completed 28 July 1946

Amazone German Corvette laid down 1947

Displacement: 1,086 t light; 1,154 t standard; 1,375 t normal; 1,552 t full load

Dimensions: Length overall / water x beam x draught

321.83 ft / 311.68 ft x 31.17 ft x 10.17 ft (normal load) [98.09 m / 95.00 m x 9.50 m x 3.10 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1947 Model Dual purpose guns in a deck mount with hoist on centreline forward
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1947 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount - superfiring
4 - 0.79" / 20.0 mm guns (2x2 guns), 0.24lbs / 0.11kg shells, 1947 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 92 lbs / 42 kg
Shells per gun, main battery: 700

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Conning tower: 0.79" / 20 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 16,111 shp / 12,019 Kw = 28.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 398 tons

Complement: 112 - 146

Cost: £0.752 million / $3.008 million

Distribution of weights at normal displacement:

Armament: 11 tons, 0.8 %
Armour: 7 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.4 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 398 tons, 29.0 %
Hull, fittings & equipment: 539 tons, 39.2 %
Fuel, ammunition & stores: 288 tons, 21.0 %
Miscellaneous weights: 130 tons, 9.5 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,422 lbs / 645 Kg = 40.2 x 4.1 " / 105 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.8 seconds
Steadiness - As gun platform (Average = 50 %): 75 %
- Recoil effect (Restricted arc if above 1.00): 0.24
Seaboat quality (Average = 1.00): 1.37

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.487
Length to Beam Ratio: 10.00: 1
'Natural speed' for length: 20.18 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 55
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 0.82 ft / 0.25 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.01 ft / 6.10 m
- Forecastle (20 %): 17.72 ft / 5.40 m
- Mid (50 %): 15.42 ft / 4.70 m
- Quarterdeck (15 %): 10.50 ft / 3.20 m
- Stern: 10.50 ft / 3.20 m
- Average freeboard: 14.81 ft / 4.51 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 113.4 %
- Above water (accommodation/working, high = better): 165.4 %
Waterplane Area: 6,650 Square feet or 618 Square metres
Displacement factor (Displacement / loading): 134 %
Structure weight / hull surface area: 40 lbs/sq ft or 197 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.72
- Longitudinal: 3.29
- Overall: 0.84
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Reserved for air and surface warning radar - 20 tons
Reserved for fire control and director radar - 20 tons
Reserved for sonar - 30 tons
Reserved for stand-off antisubmarine weapon - 40 tons
Reserved for A/S outfit - two depth charge racks, 48 depth charges - 20 tons


Amazone – Laid down 1 January 1947; Launched 3 May 1947; Completed 31 October 1947
Gazelle – Laid down 1 January 1947; Launched 3 May 1947; Completed 31 October 1947
Minerva - Laid down 1 July 1947; Launched 31 October 1947; Completed 29 April 1948
Diana - Laid down 1 July 1947; Launched 31 October 1947; Completed 29 April 1948
Thetis - Laid down 1 January 1948; Launched 2 May 1948; Completed 30 October 1948
Medusa - Laid down 1 January 1948; Launched 2 May 1948; Completed 30 October 1948
Nymphe - Laid down 1 July 1948; Launched 31 October 1948; Completed 30 April 1949
Niobe - Laid down 1 July 1948; Launched 31 October 1948; Completed 30 April 1949

Acheron, German Corvette laid down 1949

Displacement: 1,370 t light; 1,463 t standard; 1,750 t normal; 1,979 t full load

Dimensions: Length overall / water x beam x draught

329.74 ft / 321.52 ft x 32.48 ft x 11.48 ft (normal load) [100.51 m / 98.00 m x 9.90 m x 3.50 m]

Armament:

2 - 4.13" / 105 mm guns (1x2 guns), 35.32lbs / 16.02kg shells, 1949 Model Automatic rapid fire guns in a deck mount with hoist on centerline forward
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1949 Model Anti-aircraft guns in deck mounts with hoists on centerline ends, evenly spread, 1 raised mount - superfiring
4 - 2.17" / 55.0 mm guns (2x2 guns), 5.08lbs / 2.30kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, all amidships
2 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1949 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 112 lbs / 51 kg
Shells per gun, main battery: 800

Armor:

Gun armor: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -

Conning tower: 0.79" / 20 mm

Machinery:

Diesel Internal combustion motors, Geared drive, 2 shafts, 18,741 shp / 13,981 Kw = 28.00 kts
Range 8,000nm at 15.00 kts
Bunker at max displacement = 516 tons

Complement: 134 - 175

Cost: £0.952 million / $3.806 million

Distribution of weights at normal displacement:

Armament: 16 tons, 0.9 %
Armor: 8 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 6 tons, 0.3 %
- Armor Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.1 %
Machinery: 453 tons, 25.9 %
Hull, fittings & equipment: 743 tons, 42.5 %
Fuel, ammunition & stores: 380 tons, 21.7 %
Miscellaneous weights: 150 tons, 8.6 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 2,413 lbs / 1,095 Kg = 68.3 x 4.1 " / 105 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 1.1 ft / 0.3 m
Roll period: 12.9 seconds
Steadiness - As gun platform (Average = 50 %): 65 %
- Recoil effect (Restricted arc if above 1.00): 0.25
Seaboat quality (Average = 1.00): 1.28

Hull form characteristics:

Hull has a flush deck and transom stern
Block coefficient: 0.511
Length to Beam Ratio: 9.90: 1
'Natural speed' for length: 20.45 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 22.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.34 ft / 6.20 m
- Forecastle (20 %): 18.37 ft / 5.60 m
- Mid (40 %): 16.40 ft / 5.00 m
- Quarterdeck (25 %): 11.81 ft / 3.60 m
- Stern: 11.81 ft / 3.60 m
- Average freeboard: 15.20 ft / 4.63 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 103.5 %
- Above water (accommodation/working, high = better): 159.0 %
Waterplane Area: 7,309 Square feet or 679 Square meters
Displacement factor (Displacement / loading): 147 %
Structure weight / hull surface area: 51 lbs/sq ft or 249 Kg/sq meter
Hull strength (Relative):
- Cross-sectional: 0.86
- Longitudinal: 3.68
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily

Breakdown of Miscellaneous Weight

Reserved for air and surface warning radar - 20 tons
Reserved for fire control and director radar - 20 tons
Reserved for sonar - 30 tons
Reserved for stand-off antisubmarine weapon - 40 tons
Reserved for A/S outfit - two depth charge racks, 48 depth charges - 20 tons
Tropicalization - 20 tons


Acheron – Laid down 1 January 1949; Launched 6 May 1949; Completed 9 November 1949
Biene – Laid down 1 January 1949; Launched 6 May 1949; Completed 9 November 1949
Chamäleon – Laid down 1 January 1949; Launched 6 May 1949; Completed 9 November 1949
Perseus – Laid down 1 January 1949; Launched 6 May 1949; Completed 9 November 1949
Basilisk - Laid down 1 July 1949; Launched 3 November 1949
Loreley - Laid down 1 July 1949; Launched 3 November 1949
Pegasus - Laid down 1 July 1949; Launched 3 November 1949
Undine - Laid down 1 July 1949; Launched 3 November 1949