: I think the practice of giving a 10% decrese in strength while getting
: nothing in return is stupid. You are free to say it is not.

They are getting weight savings in return.

Why don't we build solid wood kayaks out of logs with just enough room carved out to sit in them? They would be a lot more than 10% stronger than the wood/glass construction that we currently use. Of course getting them to the beach might be another problem.