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The Belomore Class port icebreakers are designed to extend the usability of the Gulf of Finland, ports on the White Sea,
and along the Pacific coast. While capable of being ocean-going, they lack the power and the mass to be able to clear passage
through ice much more than a meter thick.
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Belomore Class Port Icebreaker, laid down 1917
Length, 85.0 m x Beam, 25.0 m x Depth, 4.5 m
4821 tonnes normal
displacement (4572 tonnes standard)
Main battery: 2 x 0.7-cm
Weight of broadside: 0 kg
Main belt,
5.0 cm; bow and stern, 10.0 cm
Torpedo bulkhead, 5.0 cm
Maximum speed for 9870 shaft kw = 20.00 knots
Approximate
cruising radius, 6000 nm / 10 knots
Typical complement: 289-376
Estimated cost, $1.633 million (£408,000)
Remarks:
Oil firing.
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:
Armor, total ..................... 539 tonnes = 11 pct
Belt 344 tonnes = 7 pct
Torpedo
bulkhead 195 tonnes = 4 pct
Machinery ........................ 485 tonnes = 10 pct
Hull and fittings; equipment
..... 3452 tonnes = 72 pct
Fuel, ammunition, stores ......... 345 tonnes = 7 pct
Miscellaneous weights ............
0 tonnes = 0 pct
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4821 tonnes = 100 pct
Estimated metacentric height, 1.8 m
Displacement summary:
Light ship: 4475 tonnes
Standard displacement: 4572 tonnes
Normal service: 4821 tonnes
Full load: 5000
tonnes
Loading submergence 1347 tonnes/metre
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Estimated overall survivability
and seakeeping ability:
Relative margin of stability: 1.31
Shellfire needed to sink: 7795 kg = 1562354.2 x
0.7-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 5.4
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative
steadiness as gun platform, 55 percent
(50 percent is 'average')
Relative rocking effect from firing to beam,
0.00
Relative quality as a seaboat: 1.10
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Hull form characteristics:
Block coefficient: 0.50
Sharpness coefficient: 0.47
Hull speed coefficient 'M' = 5.05
'Natural speed'
for length = 16.7 knots
Power going to wave formation
at top speed: 64 percent
Estimated hull characteristics
and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 45 percent
Relative
accommodation and working space: 202 percent
Displacement factor: 320 percent
(Displacement relative to loading
factors)
Relative cross-sectional hull strength: 1.86
(Structure weight per square
metre of hull surface:
848 kg)
Relative longitudinal hull strength: 9.30
(for 6.50 m average freeboard;
freeboard adjustment +2.51
m)
Relative composite hull strength: 2.18
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[Machine-readable parameters:
Spring Style v. 1.2.1]
278.80 x 82.00 x 14.76; 21.32 -- Dimensions
0.50 -- Block coefficient
1917 -- Year
laid down
20.00 / 6000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
0 tons -- Miscellaneous
weights
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2 x 0.28; 0 -- Main battery; turrets
Central positioning of guns
:
0 -- No secondary
battery
0 -- No tertiary (QF/AA) battery
0 -- No fourth (light) battery
0 -- No torpedo armament
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1.97 / 3.94 / 0.00 / 1.97; 100 -- Belt armor; relative extent
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor
(Note: For portability, values are stored in Anglo-American units)
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