Dneipr class river gunboat, laid down 1913
Length, 45.0 m x Beam, 6.0 m x Depth, 1.8 m
392 tonnes normal displacement (332 tonnes standard)
Main battery: 1 x 12.2-cm
Secondary
battery: 2 x 4.5-cm
QF battery: 6
x 1.3-cm
Weight of broadside: 28 kg
50 tons cargo/mines
Main belt, 3.0 cm; bow and stern, 2.0 cm
Upper belt, 3.0 cm
Armor deck, average 1.0 cm
Conning tower, 3.0 cm
Battery armor:
Main, 3.0 cm shields
/ secondary, 3.0 cm shields
QF, 3.0 cm
Maximum speed for 635 shaft kw = 14.00 knots
Approximate cruising radius, 3500 nm / 10 knots
Typical complement: 44-57
Estimated cost, $99,000 (£25,000)
Remarks:
Relative extent of belt armor, 60 percent of 'typical' coverage.
Ship has slow, easy roll; a good, steady gun platform.
Good seaboat; rides out heavy weather easily.
Magazines and engineering spaces are roomy, with superior
watertight
subdivision.
Cramped ship; poor crew accommodation, limited working space.
Main deck QF guns subject to being washed down in a seaway.
Distribution of weights:
Percent
normal
displacement:
Armament .........................
8 tonnes = 2 pct
Armor, total .....................
66 tonnes = 17 pct
Belt
43 tonnes = 11 pct
Deck
18 tonnes = 5 pct
C.T.
1 tonnes = 0 pct
Armament
3 tonnes = 1 pct
Machinery ........................ 37
tonnes = 9 pct
Hull and fittings; equipment .....
159 tonnes = 40 pct
Fuel, ammunition, stores .........
73 tonnes = 19 pct
Miscellaneous weights ............
50 tonnes = 13 pct
-----
392 tonnes = 100 pct
Estimated metacentric height, 0.1 m
Displacement summary:
Light ship:
319 tonnes
Standard displacement: 332 tonnes
Normal service:
392 tonnes
Full load:
438 tonnes
Loading submergence 234 tonnes/metre
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Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.01
Shellfire needed to sink: 346 kg = 13.7 x 12.2-cm shells
(Approximates weight of penetrating
shell hits needed to sink ship,
not
counting critical hits)
Torpedoes needed to sink: 0.7
(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, 0.30
Relative quality as a seaboat: 1.21
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Hull form characteristics:
Block coefficient: 0.80
Sharpness coefficient: 0.46
Hull speed coefficient 'M' = 6.16
'Natural speed' for length = 12.1 knots
Power going to wave formation
at top speed: 57 percent
Estimated hull characteristics and strength:
Relative underwater volume absorbed by
magazines and engineering spaces: 60 percent
Relative accommodation and working space: 79 percent
Displacement factor: 156 percent
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.33
(Structure weight per square
metre
of hull surface: 206 kg)
Relative longitudinal hull strength: 2.59
(for 2.22 m average freeboard;
freeboard
adjustment -0.20 m)
Relative composite hull strength: 1.42
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[Machine-readable parameters: Spring Style v. 1.2.1]
147.60 x 19.68 x 5.90; 7.28 -- Dimensions
0.80 -- Block coefficient
1913 -- Year laid down
14.00 / 3500 /
10.00; Turbine, coal fired -- Speed / radius / cruise
50 tons -- Miscellaneous weights
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1 x 4.80; 0
-- Main battery; turrets
Central positioning of guns
Gun-shields
:
2 x 1.77; 0
-- Secondary battery; turrets
Gun-shields
:
6 x 0.51 -- Tertiary (QF/AA) battery
Main deck battery
:
0 -- No fourth (light) battery
0 -- No torpedo armament
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1.18
/ 0.79 / 1.18 / 0.00; 60 -- Belt armor; relative extent
0.39 / 1.18 -- Deck / CT
1.18 / 1.18 / 1.18 / 0.00 -- Battery
armor
(Note: For portability, values are stored in Anglo-American units)
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