Izmail Class Battlecruiser, laid down 1913
Length, 225.0 m x Beam, 30.5 m x Depth, 9.6 m
33877 tonnes normal displacement (32486 tonnes standard)
Main battery: 12 x 35.6-cm (4 x 3; 1 superfiring)
Secondary battery: 24 x 13.0-cm (24 x 1)
QF battery:
4 x 7.5-cm (4 x 1)
Light battery: 4 x 1.3-cm
(4 x 1)
Weight of broadside: 8271 kg
6 TT, 53.0 cm
Main belt, 24.0 cm; ends unarmored
Upper belt, 10.0 cm
Torpedo bulkhead, 3.0 cm
Armor deck, average 6.0 cm
Conning tower,
39.0 cm
Battery armor:
Main, 30.5 cm / secondary,
15.0 cm
QF, 2.5 cm shields
Maximum speed for 65676 shaft kw = 27.00 knots
Approximate cruising radius, 3000 nm / 16 knots
Typical complement: 1249-1623
Estimated cost, $15.071 million (£3.768 million)
Remarks:
Oil firing.
Relative extent of belt armor, 107 percent of 'typical' coverage.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
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 ......................... 2275 tonnes =
7 pct
Armor, total ..................... 10113 tonnes =
30 pct
Belt
3140 tonnes = 9 pct
Torpedo
bulkhead 660 tonnes =
2 pct
Deck
2053 tonnes = 6 pct
C.T.
348 tonnes = 1 pct
Armament
3913 tonnes = 12 pct
Machinery ........................ 3448 tonnes =
10 pct
Hull and fittings; equipment ..... 14455 tonnes =
43 pct
Fuel, ammunition, stores ......... 3585 tonnes
= 11 pct
Miscellaneous weights ............
0 tonnes = 0 pct
-----
33877 tonnes = 100 pct
Estimated metacentric height, 1.5 m
Displacement summary:
Light ship:
30292 tonnes
Standard displacement: 32486 tonnes
Normal service: 33877 tonnes
Full load: 34855 tonnes
Loading submergence 4407 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.00
Shellfire needed to sink: 12308 kg = 19.7 x 35.6-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 3.7
(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, 0.83
Relative quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient: 0.51
Sharpness coefficient: 0.37
Hull speed coefficient 'M' = 6.98
'Natural speed' for length = 27.2 knots
Power going to wave formation
at top speed: 46 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 106 percent
Relative accommodation and working space: 141 percent
Displacement factor: 98 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.99
(Structure weight per square
metre
of hull surface: 1029 kg)
Relative longitudinal hull strength: 1.26
(for 6.20 m average freeboard;
freeboard
adjustment +0.31 m)
Relative composite hull strength: 1.01
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[Machine-readable parameters: Spring Style v. 1.2.1]
738.00 x 100.04 x 31.49; 20.34 -- Dimensions
0.51 -- Block coefficient
1913 -- Year laid down
27.00 / 3000
/ 16.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
0 tons -- Miscellaneous weights
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12 x 14.02; 4; 1 -- Main battery; turrets; superfiring
:
24 x 5.12; 0 -- Secondary battery; turrets
Main deck battery
:
4 x 2.95 -- Tertiary (QF/AA) battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
6 / 0 / 20.87 -- TT / submerged / size
++++++++++
9.45 / 0.00 / 3.94
/ 1.18; 107 -- Belt armor; relative extent
2.36 / 15.35 -- Deck / CT
12.01 / 5.91 / 0.98 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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