With the advent of today's high tech polymers- why hasn't a manufacturer designed a set of plastic rotor blades? They could be made light enough for our uses for sure (perhaps foam filled) and best of all inexpensive and shaped in different profiles....so why hasn't anyone made a ton of money with plastic blades?

It would seem they could made in any shape, size and configuration for less cost than a set of wood blades......and probably more crashworthy as well.

..just wondering.