I recently bought an Ace 4-40 biplane from ebay. There are no plans that come with the plane nor does the owner have any idea what size should go on it. Looks to me as if a .40 would be a good choice. Is there anyone out there that has one of these that could recommend a good engine for this plane. Thanks!

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crash guy,
An OS 40Fp is a two stroke engine.

rsdonomoore,
The 4 - '40' (as in .40 size) will fly okay on a 40, but better on a 46.

They're supposed to be great flying planes. Keep us posted.
Dennis-

I left one in a tree in Louisville Ky. It was an old design, for the first, low-power 4 stroke 40s. It would be great with a OS 40 LA or something with that output. Maybe even one of the new 4 stroke .3 ci with a 10X6 would be good. Just don't try to fly it fast.

Thanks for all the advice. My main reason for asking is that I have an old but reliable OS .40LA laying around. So I guess I'll mount it in there and give it a whirl. Thanks again for the info.