I wouldn't put too much stock in what the specs or HP. figures say, they
don't mean much.....because it is based on what the engine is "rated" at,
not what it will actually turn. I don't know what engines you have access to.

The Webra Speed 50 is a good engine. A Rossi with mini-tuned pipe would
be good, and runs on 5% nitro. There are others as well.

FBD.