RE: [PSUBS-MAILIST] rib span

[Jonathan Wallace <jon@psubs.org>]

Quite a difference, yes.

Ok, let me ask this...the ribs effectively act as "hull thickeners" at
specific locations.  If ribs are used, isn't the weakest point of the
cylinder limited to the length of section between ribs (ignoring end
caps for the moment)?  If so, what is the relationship of the length
of the hull overall when ribs are used?  Or in other words, if I space
my ribs 12" apart why can't I just use 12" as length in the equation
to determine the crush depth of that weak point.

If I'm not making myself clear I'll try to reword it.

Jon


>That's quite a difference, no?