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Myles,
A K-350 has ribs spaced 12 inches apart, and at the
ends where the hull tube meets the end caps, they are 10 inches apart leaving
two inches of hull tube sticking past the last frames to weld the end caps
to.
True, the frame would be easier to apply to
the outside of the hull, for convenience of working, but it's easier to spring
the hull into better roundness when working from the inside. No rolled
tube is perfect round. You have to work it as your installing
the framing.
Ribs on the outside give you more places for
corrosion to attack, but do increase the inside room. Ribs on the inside
cramp the space in the sub, but are a convenient place to clamp things that you
want to add later on, without welding on the finished sub hull.
Dan H.
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