The two IVO/Franklin 220HP successfull combos I mentined - N6Q and N570 -
are both canards. The IVO installation instructions mention that
the prop tip is expected to flex as much as 4".

(Jay) wrote in message . com...
...........
One thing that you've probably already heard, but I'll restate for
other readers, is that, on a canard, the prop lives in the downwash of
the wing and turbulence off the fuselage. As a result, each blade is
experiencing changing forces as it goes round and round. Over time
this may effect the endurance of the prop.

This is in contrast to a coventional tractor configuration where the
prop is biting into clean air. So I've heard wood props are the thing
for canards for at least that reason.