Snapphanen, Sweden ASW Frigate laid down 1950 

Displacement: 
1 903 t light; 1 965 t standard; 2 500 t normal; 2 928 t full load 

Dimensions: Length (overall / waterline) x beam x draught (normal/deep) 
(371,60 ft / 360,89 ft) x 39,37 ft x (13,12 / 14,69 ft) 
(113,26 m / 110,00 m) x 12,00 m x (4,00 / 4,48 m) 

Armament: 
2 - 2,24" / 57,0 mm 60,0 cal guns - 6,19lbs / 2,81kg shells, 1 000 per gun 
Auto rapid fire guns in deck and hoist mount , 1950 Model 
1 x Twin mount on centreline forward 
4 - 1,57" / 40,0 mm 70,0 cal guns - 2,19lbs / 0,99kg shells, 1 000 per gun 
Anti-air guns in deck mounts , 1948 Model 
4 x Single mounts on sides, evenly spread 
4 raised mounts 
Weight of broadside 21 lbs / 21 kg 
6 - 15,7" / 400 mm above water torpedoes 

Armour: 
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max) 
Main: 0,20" / 5 mm 0,20" / 5 mm 0,20" / 5 mm 
2nd: 0,04" / 1 mm 0,04" / 1 mm - 

Machinery: 
Diesel Internal combustion generators, 
Electric motors, 2 shafts, 18 843 shp / 14 057 Kw = 27,00 kts 
Range 8 000nm at 18,00 kts 
Bunker at max displacement = 964 tons 

Complement: 
176 - 229 

Cost: 
£1,035 million / $4,139 million 

Distribution of weights at normal displacement: 
Armament: 9 tons, 0,4 % 
Armour: 2 tons, 0,1 % 
- Belts: 0 tons, 0,0 % 
- Torpedo bulkhead: 0 tons, 0,0 % 
- Armament: 2 tons, 0,1 % 
- Armour Deck: 0 tons, 0,0 % 
- Conning Tower: 0 tons, 0,0 % 
Machinery: 451 tons, 18,0 % 
Hull, fittings & equipment: 1 067 tons, 42,7 % 
Fuel, ammunition & stores: 597 tons, 23,9 % 
Miscellaneous weights: 380 tons, 15,2 % 
- Hull below water: 380 tons 

Overall survivability and seakeeping ability: 
Survivability (Non-critical penetrating hits needed to sink ship): 
5 630 lbs / 2 554 Kg = 996,4 x 2,2 " / 57 mm shells or 1,3 torpedoes 
Stability (Unstable if below 1.00): 1,18 
Metacentric height 1,7 ft / 0,5 m 
Roll period: 12,7 seconds 
Steadiness - As gun platform (Average = 50 %): 93 % 
- Recoil effect (Restricted arc if above 1.00): 0,03 
Seaboat quality (Average = 1.00): 1,85 

Hull form characteristics: 
Hull has low quarterdeck , 
a normal bow and small transom stern 
Block coefficient (normal/deep): 0,469 / 0,491 
Length to Beam Ratio: 9,17 : 1 
'Natural speed' for length: 21,91 kts 
Power going to wave formation at top speed: 59 % 
Trim (Max stability = 0, Max steadiness = 100): 50 
Bow angle (Positive = bow angles forward): 25,00 degrees 
Stern overhang: 0,00 ft / 0,00 m 
Freeboard (% = length of deck as a percentage of waterline length): 
Fore end, Aft end 
- Forecastle: 10,00 %, 22,97 ft / 7,00 m, 21,33 ft / 6,50 m 
- Forward deck: 30,00 %, 21,33 ft / 6,50 m, 19,69 ft / 6,00 m 
- Aft deck: 30,00 %, 19,69 ft / 6,00 m, 19,69 ft / 6,00 m 
- Quarter deck: 30,00 %, 13,12 ft / 4,00 m, 13,12 ft / 4,00 m 
- Average freeboard: 18,19 ft / 5,55 m 

Ship space, strength and comments: 
Space - Hull below water (magazines/engines, low = better): 77,2 % 
- Above water (accommodation/working, high = better): 174,1 % 
Waterplane Area: 9 572 Square feet or 889 Square metres 
Displacement factor (Displacement / loading): 191 % 
Structure weight / hull surface area: 56 lbs/sq ft or 275 Kg/sq metre 
Hull strength (Relative): 
- Cross-sectional: 0,86 
- Longitudinal: 4,08 
- 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 

1x4 Seacat launcher 
2x4 375mm ASW RL 
Deck and hangar for 1 helicopter