5 in service
FF-A class (ex-FA-1) , Australian (ex-Italian) Frigate laid down 1916
Displacement:
820 t light; 843 t standard; 922 t normal; 982 t full load
Loading submergence 119 tons/feet
Dimensions:
223.10 ft x 26.25 ft x 9.19 ft (normal load)
68.00 m x 8.00 m x 2.80 m
Armament:
2 - 100mm / 45 guns in 2 single mounts
8 - 20mm cannons
Weight of broadside 63 lbs / 29 kg
75tons of depth charges
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 10,000 shp / 7,530 Kw = 24.00 kts
Range 5,000nm at 10.00 kts
Complement:
83 - 108
Cost:
£0.144 million / $0.576 million
Distribution of weights at normal displacement:
Armament: 8 tons, 0.9 %
Machinery: 376 tons, 40.8 %
Hull, fittings & equipment: 361 tons, 39.1 %
Fuel, ammunition & stores: 103 tons, 11.1 %
Miscellaneous weights: 75 tons, 8.1 %
Metacentric height 0.9
Remarks:
Hull space for machinery, storage & compartmentation is cramped
Room for accommodation & workspaces is excellent
Excellent seaboat, comfortable and able to fight her guns in the heaviest weather
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.14
Shellfire needed to sink: 704 lbs / 319 Kg = 23.1 x 3.9 " / 100 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.3
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 63 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.18
Relative quality as seaboat: 1.75
Hull form characteristics:
Block coefficient: 0.600
Sharpness coefficient: 0.38
Hull speed coefficient 'M': 7.00
'Natural speed' for length: 14.94 kts
Power going to wave formation at top speed: 70 %
Trim: 36
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 147.4 %
Relative accommodation and working space: 156.5 %
(Average = 100%)
Displacement factor: 104 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.86
(Structure weight / hull surface area: 44 lbs / square foot or 213 Kg / square metre)
Relative longitudinal hull strength: 4.27
(for 16.40 ft / 5.00 m average freeboard, freeboard adjustment 7.00 ft)
Relative composite hull strength: 1.01