Interesting and a little confusing for me...[sm=spinnyeyes.gif]

I am building the Clipped Wing Sig Cub at 1/4 scale, and have a Magnum 91 already fitted nicely.
This decision is based on my Precedent Aeronca Champ that at 108" span and 10.5 Lb., flys great on an old OS 61 FSR two stroker with a 13-5 APC. Takes off with authority, needs 50% to maintain level flight.

However, I've read quite a few posts indicating I may be pushing it a bit...so I started considering a Magnum (?) 120 in place, though wouldn't realy like to fit a new engine...

So now I understand that maybe I am OK with the 91? I might add I build rather light (started in the hobby with free-flight sailplanes...) and fly off asphalt. The CWC will be covered with Dave Brown's Skyloft (after happy experience with it on my Sig Smith Miniplane).

Comments?