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- Palami, Selkum Coastal Gunboat laid down 1930
- Displacement:
- 714 t light; 746 t standard; 750 t normal; 753 t full load
- Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
- (280.31 ft / 278.87 ft) x 22.97 ft x (12.14 / 12.17 ft)
- (85.44 m / 85.00 m) x 7.00 m x (3.70 / 3.71 m)
- Armament:
- 2 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 150 per gun
- Breech loading guns in deck mounts, 1930 Model
- 2 x Single mounts on centreline, evenly spread
- Weight of broadside 208 lbs / 94 kg
- Armour:
- - Belts: Width (max) Length (avg) Height (avg)
- Main: 2.17" / 55 mm 181.27 ft / 55.25 m 5.74 ft / 1.75 m
- Ends: 0.20" / 5 mm 97.57 ft / 29.74 m 5.74 ft / 1.75 m
- Upper: 0.98" / 25 mm 181.27 ft / 55.25 m 8.01 ft / 2.44 m
- Main Belt covers 100 % of normal length
- - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
- Main: 0.98" / 25 mm - -
- - Armoured deck - multiple decks:
- For and Aft decks: 0.98" / 25 mm
- Forecastle: 0.39" / 10 mm Quarter deck: 0.39" / 10 mm
- Machinery:
- Oil fired boilers, steam turbines,
- Hydraulic drive, 2 shafts, 2,835 shp / 2,115 Kw = 19.00 kts
- Range 0nm at 15.00 kts
- Bunker at max displacement = 7 tons
- Complement:
- 71 - 93
- Cost:
- £0.196 million / $0.783 million
- Distribution of weights at normal displacement:
- Armament: 31 tons, 4.1 %
- - Guns: 31 tons, 4.1 %
- Armour: 221 tons, 29.4 %
- - Belts: 152 tons, 20.2 %
- - Armament: 5 tons, 0.7 %
- - Armour Deck: 63 tons, 8.5 %
- Machinery: 86 tons, 11.5 %
- Hull, fittings & equipment: 376 tons, 50.2 %
- Fuel, ammunition & stores: 36 tons, 4.8 %
- Miscellaneous weights: 0 tons, 0.0 %
- Overall survivability and seakeeping ability:
- Survivability (Non-critical penetrating hits needed to sink ship):
- 1,942 lbs / 881 Kg = 18.9 x 5.9 " / 150 mm shells or 1.2 torpedoes
- Stability (Unstable if below 1.00): 1.01
- Metacentric height 0.6 ft / 0.2 m
- Roll period: 12.9 seconds
- Steadiness - As gun platform (Average = 50 %): 36 %
- - Recoil effect (Restricted arc if above 1.00): 0.60
- Seaboat quality (Average = 1.00): 1.44
- Hull form characteristics:
- Hull has rise forward of midbreak,
- a normal bow and small transom stern
- Block coefficient (normal/deep): 0.338 / 0.338
- Length to Beam Ratio: 12.14 : 1
- 'Natural speed' for length: 18.00 kts
- Power going to wave formation at top speed: 36 %
- Trim (Max stability = 0, Max steadiness = 100): 18
- Bow angle (Positive = bow angles forward): 5.00 degrees
- Stern overhang: 0.00 ft / 0.00 m
- Freeboard (% = length of deck as a percentage of waterline length):
- Fore end, Aft end
- - Forecastle: 20.00 %, 16.40 ft / 5.00 m, 14.76 ft / 4.50 m
- - Forward deck: 30.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
- - Aft deck: 35.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
- - Quarter deck: 15.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
- - Average freeboard: 11.61 ft / 3.54 m
- Ship tends to be wet forward
- Ship space, strength and comments:
- Space - Hull below water (magazines/engines, low = better): 51.8 %
- - Above water (accommodation/working, high = better): 117.2 %
- Waterplane Area: 3,891 Square feet or 362 Square metres
- Displacement factor (Displacement / loading): 154 %
- Structure weight / hull surface area: 41 lbs/sq ft or 200 Kg/sq metre
- Hull strength (Relative):
- - Cross-sectional: 0.90
- - Longitudinal: 5.03
- - Overall: 1.07
- Excellent machinery, storage, compartmentation space
- Adequate accommodation and workspace room
- Good seaboat, rides out heavy weather easily
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