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Pion Class Corvette
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The Pion Class is designed for coastal patrol duties.


Pion Class Corvette, laid down 1908
     Length, 65.0 m x Beam, 6.5 m x Depth, 2.6 m
          410 tonnes normal displacement (381 tonnes standard)
     Main battery:       2 x 10.0-cm
     QF battery:         4 x  3.7-cm
     Light battery:      4 x  1.3-cm
          Weight of broadside: 31 kg
     4 TT, 45.0 cm in a single quad launcher
     25 tons depth charges/mines
     Hull unarmored
     Maximum speed for 6464 shaft kw = 27.00 knots
          Approximate cruising radius, 2000 nm / 10 knots
     Typical complement: 46-59

                    Estimated cost, $197,000 (49,000)
          Remarks:
     Caution: Hull structure is subject to strain in open-sea
     conditions.
     Oil firing.
     Ship has slow, easy roll; a good, steady gun platform.
     Good seaboat; rides out heavy weather easily.
     Magazines and engineering spaces are cramped, with poor
     watertight subdivision.
     Cramped ship; poor crew accommodation, limited working space.

          Distribution of weights:
                                                       Percent
                                                       normal
                                                    displacement:
          Armament .........................      8 tonnes =   2 pct
          Machinery ........................    209 tonnes =  51 pct
          Hull and fittings; equipment .....    124 tonnes =  30 pct
          Fuel, ammunition, stores .........     43 tonnes =  10 pct
          Miscellaneous weights ............     25 tonnes =   6 pct
                                              -----
                                                410 tonnes = 100 pct
          Estimated metacentric height, 0.2 m
     Displacement summary:
          Light ship:               367 tonnes
          Standard displacement:    381 tonnes
          Normal service:           410 tonnes
          Full load:                431 tonnes
          Loading submergence 219 tonnes/metre
     +++++++++++++++++++++++++

     Estimated overall survivability and seakeeping ability:
          Relative margin of stability: 1.17
          Shellfire needed to sink: 47 kg = 3.4 x 10.0-cm shells
               (Approximates weight of penetrating
               shell hits needed to sink ship,
               not counting critical hits)
          Torpedoes needed to sink: 0.1
               (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, 0.35
          Relative quality as a seaboat: 1.44
     +++++++++++++++++++++++++

     Hull form characteristics:
          Block coefficient: 0.37
          Sharpness coefficient: 0.29
          Hull speed coefficient 'M' = 8.77
          'Natural speed' for length = 14.6 knots
          Power going to wave formation
               at top speed: 66 percent

     Estimated hull characteristics and strength:
          Relative underwater volume absorbed by
               magazines and engineering spaces: 187 percent
          Relative accommodation and working space: 70 percent

          Displacement factor: 39 percent
               (Displacement relative to loading factors)

          Relative cross-sectional hull strength: 0.49
               (Structure weight per square
               metre of hull surface: 114 kg)
          Relative longitudinal hull strength: 2.14
               (for 3.50 m average freeboard;
               freeboard adjustment +1.06 m)
          Relative composite hull strength: 0.57
     +++++++++++++++++++++++++

[Machine-readable parameters: Spring Style v. 1.2.1]
213.20 x 21.32 x 8.53; 11.48 -- Dimensions
0.37 -- Block coefficient
1908 -- Year laid down
27.00 / 2000 / 10.00; Oil-fired turbine or equivalent -- Speed / radius / cruise
25 tons -- Miscellaneous weights
++++++++++
2 x 3.94; 0 -- Main battery; turrets
  Central positioning of guns
   :
0 -- No secondary battery
4 x 1.46 -- Tertiary (QF/AA) battery
   :
4 x 0.51 -- Fourth (light) battery
4 / 0 / 17.72 -- TT / submerged / size
++++++++++
0.00 -- No belt armor
0.00 / 0.00 -- Deck / CT
0.00 -- No battery armor

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

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


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