Poseidon, Battlecruiser laid down 1942
Displacement:
38.182 t light; 39.871 t standard; 43.175 t normal; 45.818 t full load
Dimensions: Length overall / water x beam x draught
851,82 ft / 847,77 ft x 111,55 ft x 27,89 ft (normal load)
259,63 m / 258,40 m x 34,00 m x 8,50 m
Armament:
9 - 13,78" / 350 mm guns (3x3 guns), 1.308,20lbs / 593,39kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
8 - 5,91" / 150 mm guns (5 mounts), 102,98lbs / 46,71kg shells, 1942 Model
Dual purpose guns in deck mounts with hoists
on side, all amidships
16 - 4,13" / 105 mm guns (8x2 guns), 35,32lbs / 16,02kg shells, 1942 Model
Dual purpose guns in deck mounts
on side, evenly spread, 4 raised mounts
20 - 1,57" / 40,0 mm guns (10x2 guns), 1,95lbs / 0,89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 5 raised mounts
12 - 0,79" / 20,0 mm guns (6x2 guns), 0,24lbs / 0,11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 13.205 lbs / 5.990 kg
Shells per gun, main battery: 110
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 11,8" / 300 mm 635,83 ft / 193,80 m 15,94 ft / 4,86 m
Ends: Unarmoured
Upper: 3,94" / 100 mm 635,83 ft / 193,80 m 8,01 ft / 2,44 m
Main Belt covers 115 % of normal length
- Torpedo Bulkhead:
2,76" / 70 mm 635,83 ft / 193,80 m 27,99 ft / 8,53 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 11,8" / 300 mm 3,94" / 100 mm 9,84" / 250 mm
2nd: 0,98" / 25 mm 0,98" / 25 mm -
- Armour deck: 3,94" / 100 mm, Conning tower: 11,81" / 300 mm
Machinery:
Oil fired boilers, steam turbines plus diesel motors,
Electric cruising motors plus geared drives, 4 shafts, 133.122 shp / 99.309 Kw = 30,00 kts
Range 10.500nm at 16,00 kts
Bunker at max displacement = 5.948 tons
Complement:
1.496 - 1.946
Cost:
£20,425 million / $81,702 million
Distribution of weights at normal displacement:
Armament: 1.651 tons, 3,8 %
Armour: 14.810 tons, 34,3 %
- Belts: 5.828 tons, 13,5 %
- Torpedo bulkhead: 1.814 tons, 4,2 %
- Armament: 1.738 tons, 4,0 %
- Armour Deck: 5.116 tons, 11,8 %
- Conning Tower: 313 tons, 0,7 %
Machinery: 3.478 tons, 8,1 %
Hull, fittings & equipment: 17.594 tons, 40,7 %
Fuel, ammunition & stores: 4.993 tons, 11,6 %
Miscellaneous weights: 650 tons, 1,5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
81.913 lbs / 37.155 Kg = 62,6 x 13,8 " / 350 mm shells or 15,9 torpedoes
Stability (Unstable if below 1.00): 1,31
Metacentric height 9,5 ft / 2,9 m
Roll period: 15,2 seconds
Steadiness - As gun platform (Average = 50 %): 53 %
- Recoil effect (Restricted arc if above 1.00): 0,28
Seaboat quality (Average = 1.00): 1,03
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0,573
Length to Beam Ratio: 7,60 : 1
'Natural speed' for length: 33,69 kts
Power going to wave formation at top speed: 49 %
Trim (Max stability = 0, Max steadiness = 100): 51
Bow angle (Positive = bow angles forward): 10,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,97 ft / 7,00 m
- Forecastle (10 %): 19,69 ft / 6,00 m
- Mid (70 %): 19,69 ft / 6,00 m
- Quarterdeck (15 %): 18,73 ft / 5,71 m
- Stern: 18,73 ft / 5,71 m
- Average freeboard: 19,60 ft / 5,97 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70,1 %
- Above water (accommodation/working, high = better): 175,2 %
Waterplane Area: 70.244 Square feet or 6.526 Square metres
Displacement factor (Displacement / loading): 121 %
Structure weight / hull surface area: 199 lbs/sq ft or 972 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1,11
- Longitudinal: 0,96
- Overall: 1,00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent