Palk Bay - Class
Seaplane Carrier
Ships:
HICMS Palk Bay, ex-Bharat Aviation Ship laid down 1921 - purchased Q4/1939
Displacement:
6.661 t light; 6.835 t standard; 7.874 t normal; 8.706 t full load
Dimensions:
Length overall / water x beam x draught
508,95 ft / 500,00 ft x 65,00 ft x 16,00 ft (normal load)
155,13 m / 152,40 m x 19,81 m x 4,88 m
Armament:
4 - 4,13" / 105 mm guns in single mounts, 35,32lbs / 16,02kg shells, 1921 Model
Breech loading guns in deck mounts with hoists
on centreline ends, evenly spread, 2 raised mounts - superfiring
8 - 1,38" / 35,0 mm guns in single mounts, 1,31lbs / 0,59kg shells, 1921 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 4 raised mounts - superfiring
6 - 0,59" / 15,0 mm guns in single mounts, 0,10lbs / 0,05kg shells, 1921 Model
Machine guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 152 lbs / 69 kg
Shells per gun, main battery: 180
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1,97" / 50 mm 0,79" / 20 mm -
2nd: 0,79" / 20 mm - -
3rd: 0,79" / 20 mm - -
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 12.063 shp / 8.999 Kw = 19,53 kts
Range 14.000nm at 12,00 kts
Bunker at max displacement = 1.871 tons
Complement:
417 - 543
Cost:
£0,782 million / $3,129 million
Distribution of weights at normal displacement:
Armament: 19 tons, 0,2%
Armour: 17 tons, 0,2%
- Belts: 0 tons, 0,0%
- Torpedo bulkhead: 0 tons, 0,0%
- Armament: 17 tons, 0,2%
- Armour Deck: 0 tons, 0,0%
- Conning Tower: 0 tons, 0,0%
Machinery: 415 tons, 5,3%
Hull, fittings & equipment: 4.210 tons, 53,5%
Fuel, ammunition & stores: 1.213 tons, 15,4%
Miscellaneous weights: 2.000 tons, 25,4%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
19.763 lbs / 8.965 Kg = 559,5 x 4,1 " / 105 mm shells or 3,7 torpedoes
Stability (Unstable if below 1.00): 1,13
Metacentric height 3,3 ft / 1,0 m
Roll period: 15,1 seconds
Steadiness - As gun platform (Average = 50 %): 75 %
- Recoil effect (Restricted arc if above 1.00): 0,03
Seaboat quality (Average = 1.00): 1,50
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,530
Length to Beam Ratio: 7,69 : 1
'Natural speed' for length: 22,36 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 20,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,60 ft / 7,50 m
- Forecastle (20%): 15,65 ft / 4,77 m
- Mid (50%): 15,65 ft / 4,77 m
- Quarterdeck (15%): 15,65 ft / 4,77 m
- Stern: 15,65 ft / 4,77 m
- Average freeboard: 16,37 ft / 4,99 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 47,8%
- Above water (accommodation/working, high = better): 159,1%
Waterplane Area: 22.261 Square feet or 2.068 Square metres
Displacement factor (Displacement / loading): 262%
Structure weight / hull surface area: 136 lbs/sq ft or 663 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,73
- Longitudinal: 1,89
- Overall: 1,74
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
Breakdown of Misc. Weight: 2000tons:
420tons storage
1150tons gasoline (aviation fuel)
40tons (50x800kg bombs)
40tons (80x500kg bombs)
40tons (160x250kg bombs)
10tons (200x50kg bombs)
80tons (40 torpedoes)
70tons crane (2x 35tons crane)
100tons catapult
50tons 8 waterplanes (Harbin 32-A : 4 tons / Guoyong GY-196 : 4 tons)

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