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Don class river monitor
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Don class river monitor, laid down 1918

     Length, 51.0 m x Beam, 8.9 m x Depth, 1.9 m
          539 tonnes normal displacement (518 tonnes standard)

     Main battery:       1 x 23.4-cm
     Secondary battery:  1 x  7.6-cm
     AA battery:         2 x  3.7-cm
     Light battery:      4 x  1.3-cm

          Weight of broadside: 185 kg

     Main belt, 2.5 cm; bow and stern, 2.0 cm
     Upper belt, 2.5 cm
     Armor deck, average 1.0 cm
     Conning tower, 3.0 cm

     Battery armor:
          Main, 3.0 cm shields / secondary, 3.0 cm shields
          AA, 2.5 cm shields / light guns, 3.0 cm shields 

     Maximum speed for 397 shaft kw = 12.00 knots
          Approximate cruising radius, 1200 nm / 10 knots

     Typical complement: 56-73


                    Estimated cost, $498,000 (125,000)

          Remarks:

     Relative extent of belt armor, 85 percent of 'typical' coverage.

     Ship has slow, easy roll; a good, steady gun platform.

     Good seaboat; rides out heavy weather easily.

     Cramped ship; poor crew accommodation, limited working space.


          Distribution of weights:
                                                       Percent
                                                       normal
                                                    displacement:

          Armament .........................     51 tonnes =   9 pct
          Armor, total .....................    101 tonnes =  19 pct

               Belt                              67 tonnes =  12 pct
               Deck                              26 tonnes =   5 pct
               C.T.                               2 tonnes =   0 pct
               Armament                           6 tonnes =   1 pct

          Machinery ........................     21 tonnes =   4 pct
          Hull and fittings; equipment .....    301 tonnes =  56 pct
          Fuel, ammunition, stores .........     66 tonnes =  12 pct
          Miscellaneous weights ............      0 tonnes =   0 pct
                                              -----
                                                539 tonnes = 100 pct

          Estimated metacentric height, 0.3 m

     Displacement summary:

          Light ship:               473 tonnes
          Standard displacement:    518 tonnes
          Normal service:           539 tonnes
          Full load:                554 tonnes

          Loading submergence 332 tonnes/metre

     +++++++++++++++++++++++++


     Estimated overall survivability and seakeeping ability:

          Relative margin of stability: 1.17

          Shellfire needed to sink: 341 kg = 1.9 x 23.4-cm shells
               (Approximates weight of penetrating
               shell hits needed to sink ship,
               not counting critical hits)

          Torpedoes needed to sink: 0.6
               (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, 0.41

          Relative quality as a seaboat: 1.20

     +++++++++++++++++++++++++


     Hull form characteristics:

          Block coefficient: 0.62
          Sharpness coefficient: 0.44
          Hull speed coefficient 'M' = 6.28
          'Natural speed' for length = 12.9 knots
          Power going to wave formation
               at top speed: 45 percent


     Estimated hull characteristics and strength:

          Relative underwater volume absorbed by
               magazines and engineering spaces: 85 percent

          Relative accommodation and working space: 77 percent


          Displacement factor: 98 percent
               (Displacement relative to loading factors)


          Relative cross-sectional hull strength: 1.13
               (Structure weight per square
               metre of hull surface: 315 kg)

          Relative longitudinal hull strength: 2.26
               (for 1.95 m average freeboard;
               freeboard adjustment -0.62 m)

          Relative composite hull strength: 1.21

     +++++++++++++++++++++++++


[Machine-readable parameters: Spring Style v. 1.2.1]

167.28 x 29.19 x 6.23; 6.40 -- Dimensions
0.62 -- Block coefficient
1918 -- Year laid down
12.00 / 1200 / 10.00; Turbine, coal fired -- Speed / radius / cruise
 0 tons -- Miscellaneous weights
++++++++++
1 x 9.21; 0 -- Main battery; turrets
  Central positioning of guns
  Gun-shields
   :
1 x 2.99; 0 -- Secondary battery; turrets
  Gun-shields
   :
2 x 1.46 -- Tertiary (QF/AA) battery
  Gun-shields
   :
4 x 0.51 -- Fourth (light) battery
0 -- No torpedo armament
++++++++++
0.98 / 0.79 / 0.98 / 0.00; 85 -- Belt armor; relative extent
0.39 / 1.18 -- Deck / CT
1.18 / 1.18 / 1.00 / 1.18 -- Battery armor


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


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


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