I know I could go to rec. aircraft something and ask, but with all the expertise in this crowd I hope to get a quick answer. What aircraft were powered by the OX5 engine. I think it was a Wright powerplant but that's all I know. My uncle (now deceased, in bed, not in the pilot's seat.) was a member of the OX5 club, and we now have his lapel pin. He was old enough to have learned in a Jenny, but I think they had Liberty engines.
John