Oooppps,

I forgot to mention I plan using this engine in a .60 sized warbird, something like a Corsair / Focke Wulf, 62'' wing span, like the Top Flite ones.

If I got i right, I can go either with a Magnum .91 XLS, or with another good .91 engine. I did not know 91 engine were just a bit heavier than the .61s. It is hence worth to use them on .61 birds.

Thanks.