The navigator© wrote:

The erronious idea that lots of boats were built with a "geodesic grid
inside them that completely obstructs the cabin" has been raised by DSK.

A geodesic structure is usually one which encloses a space

Wrong. The term 'geodesic' refers to the structural elements, which for a
'geodesic' structure are always equilateral triangles. Ever heard of
Buckminster Fuller?



.... At design extremes where the hull is all truss with
a fabric coating we approach the design of the Zepplin.

Or a kayak, if you like to stick with boats (since that's what we're talking
about).

At another
extreme we see the submarine where closely spaced ring girders reinforce
the pressure hull and help reduce hull compression with depth.

Not a good example, the opposite extreme would be monocoque hull with no
internal structural members at all. Does such a thing exist?

Good cut-n-paste work Navvie©, now all you have to do is work on your
reading comprehension.

Fresh Breezes- Doug King