: Ok I am thinking of how to build a new yak. Here is one of my probblems, a
: flat piece of 1/8 inch ply is to flexible. I am hoping that by making a
: tri-planed hull it will help make the hull a bit stiffer. Now how would
: you go about making this hull even stiffer? Add a second layer of ply or
: lay in carbon fiber, or is there a method that I am not seeing right away?

Check out www.fiberglasssupply.com/Product_Catalog/product_catalog.html They specialize in surfboard, sailboard and kiteboard homebuilts. I was just browsing some of their core materials and it looks like you have some interesting options with lightweight cellular structures (like tiny honeycombs). I guess you could laminate that to your ply and then glass over it. I really don't know anything about it but it could be fun to play around with.