: Yes, I agree. Why not thin balsa ply? Would be stronger and I bet
: it wouldn't add too much weight. Right now he's about 2 pounds
: lighter than a conventional foam board, but I think with balsa
: if he added that 2 pounds back still he would be way stronger
: than any foam board, probably equal to a wood board, except for
: puncture resistance.

: This does bring to mind an idea for someone wanting to build a
: really light surfboard. You could just swiss-cheese a foam blank
: with tiny holes before 'glassing it. I would just put three
: balsa stringers instead of one, with the other two being spaced
: out from the center stringer. That should give some strength.

Cardboard on edge is pretty strong for it's weight, I'd bet stronger than balsa. I suspect he did it for the style rather than proving a point.

Bill H.