[Paddlewise] Stability & comfort - was Evolution Kayaks

G'Day Dave, John and Paddlewise,

As a follow on, thought I'ld test my assumed knowledge in case its wrong.
Here's an approximation, not to scale, of a chined boat cross section with
letters at the corners for reference.


               Boat X section
     A                                 E
      #                               #
       #                             #
        B                           D
              #               #
  ....................C......................X

If the section CD is aligned with the wave surface, is it the design aim,
for a chined boat that this is nearly the point of initial (primary)
stability. Would the point of secondary stability be when section CDE is
roughly aligned with the wave surface. Clearly this is an over
simplification depending on the centre of gravity of the boat and its load,
but the presence of such well defined planes in this style of boat suggests
that its not a bad approximation.

If the assumptions are correct then wouldn't chined boats have to be edged
beyond their point of initial (primary) stability to remain vertical in a
choppy sea where the wave face is at a greater angle than XCD?

All the best, PeterO
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