Imperatrica Maria, laid down 1911
Length, 166.0 m x Beam, 30.0 m x Depth, 8.3 m
23754 tonnes normal displacement (21997 tonnes standard)
Main battery: 12 x 30.5-cm (4 x 3)
Secondary battery: 18 x 13.0-cm
QF battery: 4
x 7.6-cm
Light battery: 4 x 4.7-cm
Weight of broadside: 5301 kg
4 TT, 46.0 cm
Main belt, 30.5 cm; bow and stern, 13.0 cm
Upper belt, 20.0 cm
Armor deck, average 11.5 cm
Conning tower, 30.0 cm
Battery armor:
Main, 30.0 cm / secondary,
13.0 cm
QF, 2.5 cm shields
Maximum speed for 23273 shaft kw = 21.00 knots
Approximate cruising radius, 3000 nm / 16 knots
Typical complement: 957-1244
Estimated cost, $8.554 million (£2.139 million)
Remarks:
Relative extent of belt armor, 70 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 ......................... 1458 tonnes =
6 pct
Armor, total ..................... 8596 tonnes
= 36 pct
Belt
2556 tonnes = 11 pct
Deck
3079 tonnes = 13 pct
C.T.
211 tonnes = 1 pct
Armament
2750 tonnes = 12 pct
Machinery ........................ 1392 tonnes =
6 pct
Hull and fittings; equipment ..... 9105 tonnes
= 38 pct
Fuel, ammunition, stores ......... 3203
tonnes = 13 pct
Miscellaneous weights ............
0 tonnes = 0 pct
-----
23754 tonnes = 100 pct
Estimated metacentric height, 1.9 m
Displacement summary:
Light ship:
20550 tonnes
Standard displacement: 21997 tonnes
Normal service: 23754 tonnes
Full load: 25064 tonnes
Loading submergence 3445 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.15
Shellfire needed to sink: 15561 kg = 39.5 x 30.5-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 4.1
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.49
Relative quality as a seaboat: 1.42
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Hull form characteristics:
Block coefficient: 0.57
Sharpness coefficient: 0.43
Hull speed coefficient 'M' = 5.79
'Natural speed' for length = 23.3 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: 67 percent
Relative accommodation and working space: 127 percent
Displacement factor: 104 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 0.98
(Structure weight per square
metre
of hull surface: 891 kg)
Relative longitudinal hull strength: 1.78
(for 5.50 m average freeboard;
freeboard
adjustment +0.01 m)
Relative composite hull strength: 1.04
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[Machine-readable parameters: Spring Style v. 1.2.1]
544.48 x 98.40 x 27.22; 18.04 -- Dimensions
0.57 -- Block coefficient
1911 -- Year laid down
21.00 / 3000
/ 16.00; Turbine, coal fired -- Speed / radius / cruise
0 tons -- Miscellaneous weights
++++++++++
12 x
12.01; 4; 0 -- Main battery; turrets; superfiring
:
18 x 5.12; 0 -- Secondary battery; turrets
Main deck battery
:
4 x 2.99 -- Tertiary (QF/AA) battery
Gun-shields
:
4
x 1.85 -- Fourth (light) battery
4 / 0 / 18.11 -- TT / submerged / size
++++++++++
12.01 / 5.12 / 7.87 / 0.00;
70 -- Belt armor; relative extent
4.53 / 11.81 -- Deck / CT
11.81 / 5.12 / 0.98 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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