>>I'm also unaware of any engines in which the >crankcase revolves


> The Gnome rotary engine, used on several WW1 fighter aircraft. A
>radial two-stroke, with the crank bolted to the firewall and the prop
>bolted to the case. Fuel/air mixture was fed through the hollow crank
>into the case.

Dan


To correct myself: The Gnome was a four-stroke. See

http://www.keveney.com/gnome.html

Dan