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Oka class Fast Minelayers
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Oka class fast minelayer, laid down 1922

Length, 70.0 m x Beam, 7.1 m x Depth, 3.0 m
691 tonnes normal displacement (599 tonnes standard)

Main battery: 1 x 5.7-cm (1 x 1 fwd)
AA battery: 2 x 3.7-cm (1 x 2 aft)
Light battery: 2 x 1.3-cm (1 x 1 on each beam)

Weight of broadside: 4 kg

50 tons mines and minelaying equipment

Hull unarmored

Maximum speed for 14578 shaft kw = 30.00 knots
Approximate cruising radius, 3100 nm / 15 knots

Typical complement: 67-88


Estimated cost, $790,000 (197,000)

Remarks:

Caution: Hull structure is subject to strain in open-sea
conditions.

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

Magazines and engineering spaces are cramped, with poor
watertight subdivision.


Distribution of weights:
Percent
normal
displacement:

Armament ......................... 1 tonnes = 0 pct
Machinery ........................ 364 tonnes = 53 pct
Hull and fittings; equipment ..... 169 tonnes = 24 pct
Fuel, ammunition, stores ......... 107 tonnes = 16 pct
Miscellaneous weights ............ 50 tonnes = 7 pct
-----
691 tonnes = 100 pct

Estimated metacentric height, 0.2 m

Displacement summary:

Light ship: 584 tonnes
Standard displacement: 599 tonnes
Normal service: 691 tonnes
Full load: 763 tonnes

Loading submergence 298 tonnes/metre

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


Estimated overall survivability and seakeeping ability:

Relative margin of stability: 1.13

Shellfire needed to sink: 79 kg = 30.9 x 5.7-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, 0.03

Relative quality as a seaboat: 1.00

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


Hull form characteristics:

Block coefficient: 0.46
Sharpness coefficient: 0.32
Hull speed coefficient 'M' = 7.93
'Natural speed' for length = 15.2 knots
Power going to wave formation
at top speed: 73 percent


Estimated hull characteristics and strength:

Relative underwater volume absorbed by
magazines and engineering spaces: 179 percent

Relative accommodation and working space: 115 percent


Displacement factor: 50 percent
(Displacement relative to loading factors)


Relative cross-sectional hull strength: 0.50
(Structure weight per square
metre of hull surface: 120 kg)

Relative longitudinal hull strength: 2.01
(for 3.91 m average freeboard;
freeboard adjustment +1.20 m)

Relative composite hull strength: 0.57

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


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

229.60 x 23.29 x 9.84; 12.82 -- Dimensions
0.46 -- Block coefficient
1922 -- Year laid down
30.00 / 3100 / 15.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
1 x 2.24; 0 -- Main battery; turrets
Central positioning of guns
:
0 -- No secondary battery
2 x 1.46 -- Tertiary (QF/AA) battery
:
2 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
0.00 -- No belt armor
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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