The only info I have at the present is Rossi side exhaust (1977 time frame) and then Rossi rear exhaust versions. He used the side exhaust and pipe in the 1977 Nats. I'll ask Jim when I get in better contact with him. He's a little out of touch right now.

Build another one with an OS91 four stroke and come fly the SPA contests with us. I don't have it approved yet, but should be no problem now that I've got a contact with Jim.

Rich E.