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Dvina class gunboat
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The Dvina class gunboat was built in France, to the plans of the French Niger class gunboat.

Dvina class river gunboat, laid down 1920
     Length, 67.0 m x Beam, 6.8 m x Depth, 1.8 m
          661 tonnes normal displacement (585 tonnes standard)
     Main battery:       2 x 15.0-cm
     Secondary battery:  4 x  3.7-cm
     Light battery:      8 x  1.3-cm
          Weight of broadside: 97 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
          light guns, 3.0 cm shields 
     Maximum speed for 752 shaft kw = 14.00 knots
          Approximate cruising radius, 4000 nm / 12 knots
     Typical complement: 65-85

                    Estimated cost, $441,000 (110,000)
          Remarks:
     Relative extent of belt armor, 57 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.

          Distribution of weights:
                                                       Percent
                                                       normal
                                                    displacement:
          Armament .........................     27 tonnes =   4 pct
          Armor, total .....................    100 tonnes =  15 pct
               Belt                              62 tonnes =   9 pct
               Deck                              31 tonnes =   5 pct
               C.T.                               2 tonnes =   0 pct
               Armament                           6 tonnes =   1 pct
          Machinery ........................     35 tonnes =   5 pct
          Hull and fittings; equipment .....    342 tonnes =  52 pct
          Fuel, ammunition, stores .........    108 tonnes =  16 pct
          Miscellaneous weights ............     50 tonnes =   8 pct
                                              -----
                                                661 tonnes = 100 pct
          Estimated metacentric height, 0.2 m
     Displacement summary:
          Light ship:               554 tonnes
          Standard displacement:    585 tonnes
          Normal service:           661 tonnes
          Full load:                720 tonnes
          Loading submergence 396 tonnes/metre
     +++++++++++++++++++++++++

     Estimated overall survivability and seakeeping ability:
          Relative margin of stability: 1.04
          Shellfire needed to sink: 618 kg = 13.2 x 15.0-cm shells
               (Approximates weight of penetrating
               shell hits needed to sink ship,
               not counting critical hits)
          Torpedoes needed to sink: 1.0
               (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, 0.57
          Relative quality as a seaboat: 1.21
     +++++++++++++++++++++++++

     Hull form characteristics:
          Block coefficient: 0.80
          Sharpness coefficient: 0.42
          Hull speed coefficient 'M' = 7.71
          'Natural speed' for length = 14.8 knots
          Power going to wave formation
               at top speed: 42 percent

     Estimated hull characteristics and strength:
          Relative underwater volume absorbed by
               magazines and engineering spaces: 57 percent
          Relative accommodation and working space: 89 percent

          Displacement factor: 152 percent
               (Displacement relative to loading factors)

          Relative cross-sectional hull strength: 1.47
               (Structure weight per square
               metre of hull surface: 278 kg)
          Relative longitudinal hull strength: 1.45
               (for 2.20 m average freeboard;
               freeboard adjustment -0.48 m)
          Relative composite hull strength: 1.46
     +++++++++++++++++++++++++

[Machine-readable parameters: Spring Style v. 1.2.1]
219.76 x 22.30 x 5.90; 7.22 -- Dimensions
0.80 -- Block coefficient
1920 -- Year laid down
14.00 / 4000 / 12.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
50 tons -- Miscellaneous weights
++++++++++
2 x 5.91; 0 -- Main battery; turrets
  Central positioning of guns
  Gun-shields
   :
4 x 1.46; 0 -- Secondary battery; turrets
  Gun-shields
   :
0 -- No tertiary (QF/AA) battery
8 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
1.18 / 0.79 / 1.18 / 0.00; 57 -- Belt armor; relative extent
0.39 / 1.18 -- Deck / CT
1.18 / 1.18 / 0.00 / 1.18 -- Battery armor

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

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


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