"Paul Lee" wrote in message
om...
But they cautioned against it saying the props were not suited for canard
high end
performance.so it really is shoping for the "right" prop for your
particular application.



There are applications where NO prop is a really good option. A high
horsepower
pusher with the prop in disturbed air is one of those. A small diameter
running at high prop RPM makes it even worse.

A carbon fiber prop has almost no damping. Any cyclical vibrations will just
build and build as energy is input on each cycle and not dissipated.
Eventually a warp drive prop as a pusher in a disturbed airflow (
http://beta.communities.fr.msn.ca/Ad...99668152588100 )
has failed with cracks longitudinally at the tips. That's why wood props are
popular with canards. Energy is dissipated as fast as it's input, so big
vibrations do not build up.

The problem with wood is that (at least in my experience) is not very
efficient. Everyone I know (including myself) who has switched from wood to
carbon has seen a large increase in performance.

Like I said - no good option.