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Arctica class Icebreakers
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These are the ships that will challenge the ice on the Northern Sea Route!

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
-----
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

+++++++++++++++++++++++++


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

+++++++++++++++++++++++++


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

+++++++++++++++++++++++++


[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
++++++++++
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
++++++++++
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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