abufletcher,

Your information will be digested, thanks for the reply.

I already own a Enya 1.20R 4S and a 1.20 4S. Plus an OS 90 4S.

You may be correct in what you say. I strongly believe the 1.20 just isn't enough engine for a bi-plane at 80"?

I may be incorrect, and I'm fully open to conversation and suggestions.

Keep in mind the long nose moment. Last thing I need is to add addiotional weight to the tail for balance.

4 Strokes? OK, who makes the lightest and most powerful for this particular application. Don't forget my interest in a three blade prop.

Your help is appreciated.

Charles