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Roza class corvettes, laid down 1923
Length, 70.0 m x Beam, 7.0 m x Depth, 3.0 m
667
tonnes normal displacement (610 tonnes standard)
Main battery: 3 x 10.0-cm
AA battery: 2 x 3.7-cm
Light battery:
4 x 1.3-cm
Weight of broadside: 43 kg
4 TT, 53.0 cm in a single quadruple mount
15 tons depth charges/mines
Hull unarmored
Battery armor:
Main, 2.5 cm shields
AA, 2.5 cm shields
Maximum speed for 16312
shaft kw = 31.00 knots
Approximate cruising radius, 3400 nm / 12 knots
Typical complement: 66-85
Estimated
cost, $921,000 (£230,000)
Remarks:
Caution: Hull structure is subject to strain in open-sea
conditions.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
Magazines
and engineering spaces are cramped, with poor
watertight subdivision.
Distribution of weights:
Percent
normal
displacement:
Armament ......................... 12 tonnes = 2 pct
Armor, total .....................
4 tonnes = 1 pct
Armament 4 tonnes = 1 pct
Machinery ........................ 347 tonnes = 52 pct
Hull
and fittings; equipment ..... 211 tonnes = 32 pct
Fuel, ammunition, stores ......... 78 tonnes = 12 pct
Miscellaneous
weights ............ 15 tonnes = 2 pct
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667 tonnes = 100 pct
Estimated metacentric height, 0.2 m
Displacement
summary:
Light ship: 589 tonnes
Standard displacement: 610 tonnes
Normal service: 667 tonnes
Full load:
710 tonnes
Loading submergence 289 tonnes/metre
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Estimated overall survivability
and seakeeping ability:
Relative margin of stability: 1.08
Shellfire needed to sink: 82 kg = 5.9 x 10.0-cm
shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes
needed to sink: 0.2
(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, 0.47
Relative
quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient:
0.45
Sharpness coefficient: 0.31
Hull speed coefficient 'M' = 8.03
'Natural speed' for length = 15.2 knots
Power
going to wave formation
at top speed: 74 percent
Estimated hull characteristics and strength:
Relative
underwater volume absorbed by
magazines and engineering spaces: 184 percent
Relative accommodation and working
space: 92 percent
Displacement factor: 42 percent
(Displacement relative to loading factors)
Relative
cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 143 kg)
Relative longitudinal
hull strength: 2.94
(for 4.57 m average freeboard;
freeboard adjustment +1.89 m)
Relative composite hull strength:
0.59
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[Machine-readable parameters: Spring Style v. 1.2.1]
229.60 x 22.96
x 9.84; 15.00 -- Dimensions
0.45 -- Block coefficient
1923 -- Year laid down
31.00 / 3400 / 12.00; Oil-fired turbine
or equivalent -- Speed / radius / cruise
15 tons -- Miscellaneous weights
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3 x 3.94; 0 -- Main battery;
turrets
Central positioning of guns
Gun-shields
:
0 -- No secondary battery
2 x 1.46 -- Tertiary (QF/AA)
battery
Gun-shields
:
4 x 0.51 -- Fourth (light) battery
4 / 0 / 20.87 -- TT / submerged / size
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0.00 -- No belt armor
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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