I've got a Rossi 45 with a mini pipe I'm going to power mine with. The Rossi weighs almost as much as a 61, so I don't think I'm going to have the balance problems some guys have had with lighter engines.

One thing, and maybe I'm having a "senior moment"...the instructions call for a balance point 4-5" from "the leading edge of the wing against the fuselage". Is the cg measured from the cutout in the front of the wing, or is it off the very front of the leading edge?