Just in case, I should define what I mean by radial rotary. A standard radial is where the engine block, cylinders radiating out like spokes, is bolted to the plane, the propeller is bolted to the crankshaft, and the prop and crank spin. A rotary radial is where the crank is bolted to the plane, the propeller is attached to the crankCASE, and the prop, along with the crankcase, cylinders and all, spin around. It's quite a site, but I thought unlikely for use in a motorcycle. I have seen a rotary radial in a car, a five cylinder, the whole thing spinning around in a sheet metal shroud behind the seats, between the rear wheels. It was a 191x something, from back in the heyday of rotary radials. Check it out if you're ever in Reno, it's at the National Automobile Museum (formerly the Harrah collection). It's interesting to see how all the design features we take for granted today weren't always standard. They have one car with the driver in the center, another with the driver in the back seat. Wild... Keleigh PS. Come to think of it, I have seen a small rotary radial mounted inside a motorcycle wheel, so that the cylinders formed the spokes, and the crank was the hub. That was probably from back in the 'teens as well, but I don't remember. Tom Jennings wrote: > On Mon, 5 Mar 2007, Keleigh Hardie wrote: > > >> A Wankel rotary, or a radial rotary? >> > > Small aircraft, pistons, cylinders, all that rot! Cool! > > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://www.amc-list.com/mailman/listinfo/amc-list > > _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list