In Australia there is a manufacturer of a 9 cylinder radial engine called the Rotec R3600. I'm looking into the feasiblity of building a 70-80% scale gladiator powered by this engine. It probably won't work without major alteration to the look of the original gladiator, in which case I won't take it any further. Right now I'm collecting information and trying to determine some weights and dimentions. However, regardless of what happens I enjoy the research and all the challenges of such a project. I'm an engineer by trade, have a pilots licence, and have helped construct a homebuilt (I have 2 in a shed out back). Thanks for your offer of assistance.