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Donets class gunboat
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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

     +++++++++++++++++++++++++


     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

     +++++++++++++++++++++++++


     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

     +++++++++++++++++++++++++


[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
++++++++++
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
++++++++++
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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