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Arctica class Icebreakers, laid down 1922
Length, 170.0 m x Beam, 33.0 m x Depth, 5.5
m
15243 tonnes normal displacement (11075 tonnes standard)
Main battery: 4 x 13.0-cm (2 x 2)
AA battery: 8
x 3.7-cm
Light battery: 4 x 1.3-cm
Weight of broadside: 128 kg
Main belt, 5.0 cm; bow and stern, 10.0
cm
Torpedo bulkhead, 10.0 cm
Battery armor:
Main, 2.5 cm
AA, 2.5 cm shields
Aircraft - 3 Sea/Skiplanes,
1 Catapult
Cargo - 1000 tons
Maximum speed for 21312 shaft kw = 22.00 knots
Approximate cruising radius,
22200 nm / 15 knots
Typical complement: 343-446
Estimated cost, $5.905 million (£1.476 million)
Remarks:
Relative extent of belt armor, 50 percent of 'typical' coverage.
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.
Distribution of weights:
Percent
normal
displacement:
Armament
......................... 35 tonnes = 0 pct
Armor, total ..................... 1362 tonnes = 9 pct
Belt 377 tonnes
= 2 pct
Torpedo bulkhead 953 tonnes = 6 pct
Armament 31 tonnes = 0 pct
Machinery ........................
969 tonnes = 6 pct
Hull and fittings; equipment ..... 7306 tonnes = 48 pct
Fuel, ammunition, stores ......... 4496
tonnes = 29 pct
Miscellaneous weights ............ 1075 tonnes = 7 pct
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15243 tonnes = 100 pct
Estimated
metacentric height, 5.1 m
Displacement summary:
Light ship: 10747 tonnes
Standard displacement: 11075
tonnes
Normal service: 15243 tonnes
Full load: 18517 tonnes
Loading submergence 3507 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.99
Shellfire
needed to sink: 27097 kg = 888.3 x 13.0-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 18.4
(Approximates number of 'typical'
torpedo hits
needed to sink ship)
Relative steadiness as gun platform, 47 percent
(50 percent is 'average')
Relative
rocking effect from firing to beam, 0.00
Relative quality as a seaboat: 1.21
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Hull
form characteristics:
Block coefficient: 0.49
Sharpness coefficient: 0.41
Hull speed coefficient 'M' = 6.88
'Natural speed' for length = 23.6 knots
Power going to wave formation
at top speed: 44 percent
Estimated
hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 39
percent
Relative accommodation and working space: 171 percent
Displacement factor: 327 percent
(Displacement
relative to loading factors)
Relative cross-sectional hull strength: 1.50
(Structure weight per square
metre
of hull surface: 783 kg)
Relative longitudinal hull strength: 1.50
(for 5.02 m average freeboard)
Relative
composite hull strength: 1.50
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[Machine-readable parameters: Spring Style v.
1.2.1]
557.60 x 108.24 x 18.04; 16.47 -- Dimensions
0.49 -- Block coefficient
1922 -- Year laid down
22.00
/ 22200 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
1075 tons -- Miscellaneous weights
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4 x 5.12; 2; 0 -- Main battery; turrets; superfiring
:
0 -- No secondary battery
8 x 1.46 -- Tertiary (QF/AA)
battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
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1.97
/ 3.94 / 0.00 / 3.94; 50 -- Belt armor; relative extent
0.00 / 0.00 -- Deck / CT
0.98 / 0.00 / 0.98 / 0.00 -- Battery
armor
(Note: For portability, values are stored in Anglo-American units)
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