Donets class river gunboat, laid down 1911
Length, 45.0 m x Beam, 4.5 m x Depth, 1.4 m
229 tonnes normal displacement (189 tonnes standard)
Main battery: 1 x 7.6-cm
Secondary battery: 2 x 4.5-cm
QF battery:
4 x 1.3-cm
Weight of broadside: 9 kg
10 tons cargo/mines
Hull unarmored
Battery armor:
Main, 2.5 cm shields
/ secondary, 2.5 cm shields
Maximum speed for 751 shaft kw = 16.00 knots
Approximate cruising radius, 3000 nm / 10 knots
Typical complement: 29-38
Estimated cost, $59,000 (£15,000)
Remarks:
Ship has slow, easy roll; a good, steady gun platform.
Excellent seaboat; comfortable and able to fight her guns
in the
heaviest weather.
Magazines and engineering spaces are roomy, with superior
watertight
subdivision.
Distribution of weights:
Percent
normal
displacement:
Armament .........................
2 tonnes = 1 pct
Armor, total .....................
1 tonnes = 1 pct
Armament
1 tonnes = 1 pct
Machinery ........................ 45 tonnes
= 20 pct
Hull and fittings; equipment .....
124 tonnes = 54 pct
Fuel, ammunition, stores .........
46 tonnes = 20 pct
Miscellaneous weights ............
10 tonnes = 4 pct
-----
229 tonnes = 100 pct
Estimated metacentric height, 0.1 m
Displacement summary:
Light ship:
183 tonnes
Standard displacement: 189 tonnes
Normal service:
229 tonnes
Full load:
259 tonnes
Loading submergence 176 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.04
Shellfire needed to sink: 190 kg = 31.2 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, 0.27
Relative quality as a seaboat: 1.51
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Hull form characteristics:
Block coefficient: 0.80
Sharpness coefficient: 0.42
Hull speed coefficient 'M' = 7.37
'Natural speed' for length = 12.1 knots
Power going to wave formation
at top speed: 60 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 77 percent
Relative accommodation and working space: 92 percent
Displacement factor: 189 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.57
(Structure weight per square
metre
of hull surface: 195 kg)
Relative longitudinal hull strength: 3.08
(for 2.31 m average freeboard;
freeboard
adjustment +0.14 m)
Relative composite hull strength: 1.68
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[Machine-readable parameters: Spring Style v. 1.2.1]
147.60 x 14.76 x 4.59; 7.58 -- Dimensions
0.80 -- Block coefficient
1911 -- Year laid down
16.00 / 3000 / 10.00;
Turbine, coal fired -- Speed / radius / cruise
10 tons -- Miscellaneous weights
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1 x 2.99; 0 -- Main
battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.77; 0 -- Secondary
battery; turrets
Gun-shields
:
4 x 0.51 -- Tertiary (QF/AA) battery
:
0
-- No fourth (light) battery
0 -- No torpedo armament
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0.00 -- No belt armor
0.00 / 0.00 -- Deck
/ CT
0.98 / 0.98 / 0.00 / 0.00 -- Battery armor
(Note: For portability, values are stored in Anglo-American units)
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