Levin class Russian Patrol Boat, laid down 1913
Length, 50.0 m x Beam, 7.5 m x Depth, 1.8 m
340 tonnes normal displacement (305 tonnes standard)

Main battery: 1 x 7.6-cm
Secondary battery: 1 x 5.7-cm
QF battery: 2 x 3.7-cm
Light battery: 2 x 0.8-cm
Weight of broadside: 10 kg
30 tons depth charges/mines/cargo

Hull unarmored
Conning tower, 2.5 cm
Battery armor:
Main, 2.5 cm shields / secondary, 2.5 cm shields
QF, 2.5 cm shields
Maximum speed for 1392 shaft kw = 18.00 knots
Approximate cruising radius, 2500 nm / 10 knots
Typical complement: 40-51
Estimated cost, $105,000 (£26,000)

Remarks:
Ship has slow, easy roll; a good, steady gun platform.
Excellent seaboat; comfortable and able to fight her guns in the heaviest weather.
Ship is roomy, with superior accommodation and working space.

Distribution of weights:
Percent normal displacement:
Armament ......................... 3 tonnes = 1 pct
Armor, total ..................... 3 tonnes = 1 pct
C.T. 1 tonnes = 0 pct
Armament 2 tonnes = 1 pct
Machinery ........................ 80 tonnes = 24 pct
Hull and fittings; equipment ..... 180 tonnes = 53 pct
Fuel, ammunition, stores ......... 44 tonnes = 13 pct
Miscellaneous weights ............ 30 tonnes = 9 pct

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340 tonnes = 100 pct
Estimated metacentric height, 0.2 m
Displacement summary:
Light ship: 296 tonnes
Standard displacement: 305 tonnes
Normal service: 340 tonnes
Full load: 367 tonnes
Loading submergence 238 tonnes/metre

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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.10
Shellfire needed to sink: 288 kg = 47.2 x 7.6-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not counting critical hits)
Torpedoes needed to sink: 0.5
(Approximates number of 'typical'
torpedo hits needed to sink ship)
Relative steadiness as gun platform, 71 percent
(50 percent is 'average')
Relative rocking effect from firing to beam, 0.08
Relative quality as a seaboat: 1.50

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Hull form characteristics:
Block coefficient: 0.50
Sharpness coefficient: 0.38
Hull speed coefficient 'M' = 7.18
'Natural speed' for length = 12.8 knots
Power going to wave formation
at top speed: 62 percent

Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 93 percent
Relative accommodation and working space: 132 percent

Displacement factor: 157 percent
(Displacement relative to loading factors)

Relative cross-sectional hull strength: 1.09
(Structure weight per square
metre of hull surface: 203 kg)
Relative longitudinal hull strength: 4.59
(for 3.30 m average freeboard;
freeboard adjustment +0.95 m)
Relative composite hull strength: 1.25

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[Machine-readable parameters: Spring Style v. 1.2.1]
164.00 x 24.60 x 5.90; 10.82 -- Dimensions
0.50 -- Block coefficient
1913 -- Year laid down
18.00 / 2500 / 10.00; Turbine, coal fired -- Speed / radius / cruise
30 tons -- Miscellaneous weights
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1 x 2.99; 0 -- Main battery; turrets
Central positioning of guns
Gun-shields
:
1 x 2.24; 0 -- Secondary battery; turrets
Gun-shields
:
2 x 1.46 -- Tertiary (QF/AA) battery
Gun-shields
:
2 x 0.31 -- Fourth (light) battery
0 -- No torpedo armament
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0.00 -- No belt armor
0.00 / 0.98 -- Deck / CT
0.98 / 0.98 / 0.98 / 0.00 -- Battery armor

(Note: For portability, values are stored in Anglo-American units)

 
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