Wow guys, all great information. I leave for an afternoon and come back to a lot of great reading.

On the subject of torque vs RPMs, the plan on this bird calls for a 7"x4" Graupner prop. In this application I would guess that the high rev engine would be favored if only for the limited space allowed by the pylon atop the wing. Stretching the pylon would really screw things up. So I'm thinking the K&B might be the ticket. On the other hand, I see that the 1.15 BHP is with a tuned pipe and 30% nitro, AND the recommeded prop range is 8x6 to 9x5. My plan won't even fit an 8" prop and of course the tuned pipe is moot. Perhaps the K&B is simply too much engine? (I didnt think I'd ever say that.)