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General-Admiral Apraksin class light cruisers

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These light cruisers feature an exceptionally powerful main armament. 

apraxin.gif

General Admiral Apraksin class light cruisers, laid down 1922

Length, 180.0 m x Beam, 16.7 m x Depth, 6.3 m
8974 tonnes normal displacement (7784 tonnes standard)

Main battery: 12 x 15.0-cm (4 x 3; 2 superfiring)
Secondary battery: 12 x 10.0-cm (6 x 2)
AA battery: 16 x 3.7-cm

Weight of broadside: 739 kg

12 TT, 53.0 cm in two sextuple mounts

Main belt, 7.5 cm; ends unarmored
Armor deck, average 2.5 cm
Conning tower, 5.0 cm

Battery armor:
Main, 7.5 cm / secondary, 2.5 cm
AA, 2.5 cm shields

Aircraft - 2 Seaplanes, 1 Catapult

Maximum speed for 54141 shaft kw = 31.50 knots
Approximate cruising radius, 9000 nm / 15 knots

Typical complement: 461-599


Estimated cost, $8.473 million (2.118 million)

Remarks:

Relative extent of belt armor, 108 percent of 'typical' coverage.

Ship has slow, easy roll; a good, steady gun platform.

Good seaboat; rides out heavy weather easily.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 203 tonnes = 2 pct
Armor, total ..................... 1198 tonnes = 13 pct

Belt 442 tonnes = 5 pct
Deck 355 tonnes = 4 pct
C.T. 18 tonnes = 0 pct
Armament 382 tonnes = 4 pct

Machinery ........................ 2461 tonnes = 27 pct
Hull and fittings; equipment ..... 3557 tonnes = 40 pct
Fuel, ammunition, stores ......... 1505 tonnes = 17 pct
Miscellaneous weights ............ 50 tonnes = 1 pct
-----
8974 tonnes = 100 pct

Estimated metacentric height, 0.7 m

Displacement summary:

Light ship: 7469 tonnes
Standard displacement: 7784 tonnes
Normal service: 8974 tonnes
Full load: 9890 tonnes

Loading submergence 1827 tonnes/metre

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Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.09

Shellfire needed to sink: 4044 kg = 86.4 x 15.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)

Torpedoes needed to sink: 1.3
(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, 0.61

Relative quality as a seaboat: 1.20

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Hull form characteristics:

Block coefficient: 0.47
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.69
'Natural speed' for length = 24.3 knots
Power going to wave formation
at top speed: 53 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 107 percent

Relative accommodation and working space: 115 percent


Displacement factor: 116 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.97
(Structure weight per square
metre of hull surface: 501 kg)

Relative longitudinal hull strength: 1.30
(for 5.80 m average freeboard;
freeboard adjustment +1.28 m)

Relative composite hull strength: 1.00

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[Machine-readable parameters: Spring Style v. 1.2.1]

590.40 x 54.78 x 20.66; 19.02 -- Dimensions
0.47 -- Block coefficient
1922 -- Year laid down
31.50 / 9000 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
12 x 5.91; 4; 2 -- Main battery; turrets; superfiring
:
12 x 3.94; 6 -- Secondary battery; turrets
:
16 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
0 -- No fourth (light) battery
12 / 0 / 20.87 -- TT / submerged / size
++++++++++
2.95 / 0.00 / 0.00 / 0.00; 108 -- Belt armor; relative extent
0.98 / 1.97 -- Deck / CT
2.95 / 0.98 / 0.98 / 0.00 -- Battery armor


(Note: For portability, values are stored in Anglo-American units)


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