Fly a full VW and count on a maximum sustained power of 40HP, with
higher power available for short term (takeoff) use.
Is there a better choice of engine for this plane?

I'm beginning to warm up to a Harley-Davidson conversion.

The output of the crank is designed for the loads of a drive belt, to mount
a PSRU. The right cam will put out a bunch of torque at a reasonable RPM,
and there is a newer engine with a counter balance shaft.

http://www.skyray.us/index.htm
--
Jim in NC