Petropavlovsk Class Battleship, laid down 1909
Length, 183.0 m x Beam, 24.5 m x Depth, 8.4 m
24679 tonnes normal displacement (23314 tonnes standard)
Main battery: 12 x 30.5-cm (4 x 3)
Secondary battery: 16 x 13.0-cm
QF battery: 4
x 4.8-cm
Light battery: 8 x 1.3-cm
Weight of broadside: 5202 kg
4 TT, 45.7 cm
Main belt, 27.9 cm; bow and stern, 12.7 cm
Upper belt, 20.3 cm
Armor deck, average 11.4 cm
Conning tower, 25.4 cm
Battery armor:
Main, 30.5 cm / secondary,
15.2 cm
QF, 2.5 cm shields / light guns, 1.3 cm shields
Maximum speed for 32532 shaft kw = 23.00 knots
Approximate cruising radius, 6000 nm / 10 knots
Typical complement: 985-1280
Estimated cost, $9.088 million (£2.272 million)
Remarks:
Relative extent of belt armor, 75 percent of 'typical' coverage.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
Magazines and engineering spaces are roomy, with superior
watertight
subdivision.
Ship is roomy, with superior accommodation and working space.
Main deck secondary guns subject to being washed down
in a seaway.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 1430 tonnes =
6 pct
Armor, total ..................... 8551 tonnes
= 35 pct
Belt
2569 tonnes = 10 pct
Deck
3001 tonnes = 12 pct
C.T.
183 tonnes = 1 pct
Armament
2797 tonnes = 11 pct
Machinery ........................ 2180 tonnes =
9 pct
Hull and fittings; equipment ..... 9706 tonnes
= 39 pct
Fuel, ammunition, stores ......... 2812
tonnes = 11 pct
Miscellaneous weights ............
0 tonnes = 0 pct
-----
24679 tonnes = 100 pct
Estimated metacentric height, 1.1 m
Displacement summary:
Light ship:
21867 tonnes
Standard displacement: 23314 tonnes
Normal service: 24679 tonnes
Full load: 25672 tonnes
Loading submergence 3387 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.01
Shellfire needed to sink: 13365 kg = 34.0 x 30.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 3.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 70 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.99
Relative quality as a seaboat: 1.25
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Hull form characteristics:
Block coefficient: 0.65
Sharpness coefficient: 0.42
Hull speed coefficient 'M' = 6.31
'Natural speed' for length = 24.5 knots
Power going to wave formation
at top speed: 47 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 74 percent
Relative accommodation and working space: 122 percent
Displacement factor: 102 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.12
(Structure weight per square
metre
of hull surface: 909 kg)
Relative longitudinal hull strength: 1.51
(for 5.50 m average freeboard;
freeboard
adjustment -0.03 m)
Relative composite hull strength: 1.16
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[Machine-readable parameters: Spring Style v. 1.2.1]
600.24 x 80.36 x 27.55; 18.04 -- Dimensions
0.65 -- Block coefficient
1909 -- Year laid down
23.00 / 6000
/ 10.00; Turbine, coal fired -- Speed / radius / cruise
0 tons -- Miscellaneous weights
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12 x
12.00; 4; 0 -- Main battery; turrets; superfiring
:
16 x 5.10; 0 -- Secondary battery; turrets
Main deck battery
:
4 x 1.90 -- Tertiary (QF/AA) battery
Gun-shields
:
8
x 0.50 -- Fourth (light) battery
4 / 0 / 18.00 -- TT / submerged / size
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10.98 / 5.00 / 7.99 / 0.00;
75 -- Belt armor; relative extent
4.49 / 10.00 -- Deck / CT
12.00 / 6.00 / 1.00 / 0.50 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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