Potomac, US light battleship laid down 1942 (Engine 1943)
Displacement:
14 281 t light; 15 188 t standard; 16 113 t normal; 16 854 t full load
Dimensions: Length overall / water x beam x draught
470,15 ft / 469,16 ft x 83,99 ft x 26,90 ft (normal load)
143,30 m / 143,00 m x 25,60 m x 8,20 m
Armament:
6 - 14,02" / 356 mm guns in single mounts, 1 376,64lbs / 624,43kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
6 - 5,00" / 127 mm guns in single mounts, 62,50lbs / 28,35kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships
16 - 1,57" / 40,0 mm guns (4x4 guns), 1,95lbs / 0,88kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 8 666 lbs / 3 931 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 14,0" / 356 mm 194,88 ft / 59,40 m 11,81 ft / 3,60 m
Ends: Unarmoured
Main Belt covers 64% of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1,46" / 37 mm 335,63 ft / 102,30 m 19,69 ft / 6,00 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16,0" / 406 mm 13,0" / 330 mm 14,0" / 356 mm
2nd: 2,99" / 76 mm 2,24" / 57 mm 2,99" / 76 mm
- Armour deck: 4,02" / 102 mm, Conning tower: 15,00" / 381 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 25 207 shp / 18 805 Kw = 21,00 kts
Range 10 000nm at 12,00 kts
Bunker at max displacement = 1 667 tons
Complement:
714 - 929
Cost:
£9,551 million / $38,205 million
Distribution of weights at normal displacement:
Armament: 1 083 tons, 6,7%
Armour: 6 568 tons, 40,8%
- Belts: 1 623 tons, 10,1%
- Torpedo bulkhead: 356 tons, 2,2%
- Armament: 2 374 tons, 14,7%
- Armour Deck: 2 009 tons, 12,5%
- Conning Tower: 206 tons, 1,3%
Machinery: 651 tons, 4,0%
Hull, fittings & equipment: 5 879 tons, 36,5%
Fuel, ammunition & stores: 1 832 tons, 11,4%
Miscellaneous weights: 100 tons, 0,6%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
21 092 lbs / 9 567 Kg = 15,3 x 14,0 " / 356 mm shells or 4,4 torpedoes
Stability (Unstable if below 1.00): 1,03
Metacentric height 4,1 ft / 1,2 m
Roll period: 17,5 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0,55
Seaboat quality (Average = 1.00): 1,20
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0,532
Length to Beam Ratio: 5,59 : 1
'Natural speed' for length: 21,66 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 2,30 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 24,61 ft / 7,50 m
- Forecastle (20%): 18,37 ft / 5,60 m
- Mid (50%): 13,12 ft / 4,00 m
- Quarterdeck (15%): 13,12 ft / 4,00 m
- Stern: 13,78 ft / 4,20 m
- Average freeboard: 15,51 ft / 4,73 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 85,7%
- Above water (accommodation/working, high = better): 103,4%
Waterplane Area: 27 041 Square feet or 2 512 Square metres
Displacement factor (Displacement / loading): 97%
Structure weight / hull surface area: 157 lbs/sq ft or 765 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,94
- Longitudinal: 1,85
- Overall: 1,00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
Good seaboat, rides out heavy weather easily
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