Russell, Maybe someone on the COZY list has an SAE 2 prop they'd let you
test with (pusher CCW prop is a tractor CW prop and vice versa) Might
take the guess work out real quick. Tracy, Ed, you got a spare prop or
know someone who does?

Rick, I bet Tracy still has that IVO Magnum prop that he tested a while back.  I bet I could even guilt him into letting me borrow it, but I'm not quite at that point yet.  I did some searches on the RV list, and found that there are a number of folks using the Warp props with Belted Drive systems.  There weren't any serious performance issue reported that I could see, and in fact, I found lots of praise of Warp for their honesty in performance figures.  I have to say that they have been fantastic to deal with, and seem sincerely interested in getting results.  They told me to call them when I got some RPM numbers, and they would give me HP figures, so I plan to do just that tomorrow.  I'll be more than a little interested to hear what they have to say. 

Rusty