Too much armament on a small hull. You want some of these babies instead. Merchantile type construction, nice and easy to produce and operate. Good seakeeping speed and range. Armament is pretty easy to refit with whatever you want as there are no deck penetrations.
Gabbiano, Italian Corvetta Cacciasommergibili laid down 1932
Displacement:
611 t light; 628 t standard; 728 t normal; 808 t full load
Dimensions: Length overall / water x beam x draught
207.89 ft / 196.85 ft x 28.54 ft x 8.20 ft (normal load)
63.37 m / 60.00 m x 8.70 m x 2.50 m
Armament:
1 - 3.94" / 100 mm guns in single mounts, 33.07lbs / 15.00kg shells, 1932 Model
Anti-aircraft gun in deck mount
on centreline forward
4 - 0.98" / 25.0 mm guns (2x2 guns), 0.48lbs / 0.22kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
4 - 0.98" / 25.0 mm guns in single mounts, 0.48lbs / 0.22kg shells, 1932 Model
Anti-aircraft guns in deck mounts
on side, all forward
Weight of broadside 37 lbs / 17 kg
Shells per gun, main battery: 100
2 - 17.7" / 450 mm above water torpedoes
Machinery:
Diesel Internal combustion motors,
Electric cruising motors plus geared drives, 2 shafts, 4,000 shp / 2,984 Kw = 19.62 kts
Range 6,000nm at 12.00 kts
Bunker at max displacement = 180 tons
Complement:
69 - 91
Cost:
£0.189 million / $0.755 million
Distribution of weights at normal displacement:
Armament: 4 tons, 0.6 %
Machinery: 118 tons, 16.2 %
Hull, fittings & equipment: 450 tons, 61.8 %
Fuel, ammunition & stores: 117 tons, 16.1 %
Miscellaneous weights: 39 tons, 5.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,897 lbs / 860 Kg = 62.2 x 3.9 " / 100 mm shells or 1.0 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.2 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.07
Seaboat quality (Average = 1.00): 1.75
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.553
Length to Beam Ratio: 6.90 : 1
'Natural speed' for length: 14.03 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 3.28 ft / 1.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.33 ft / 6.50 m
- Forecastle (20 %): 18.04 ft / 5.50 m
- Mid (60 %): 16.40 ft / 5.00 m (8.20 ft / 2.50 m aft of break)
- Quarterdeck (15 %): 8.20 ft / 2.50 m
- Stern: 8.20 ft / 2.50 m
- Average freeboard: 14.04 ft / 4.28 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 63.9 %
- Above water (accommodation/working, high = better): 123.2 %
Waterplane Area: 3,932 Square feet or 365 Square metres
Displacement factor (Displacement / loading): 235 %
Structure weight / hull surface area: 56 lbs/sq ft or 274 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.25
- Longitudinal: 11.30
- Overall: 1.55
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather