On Fri, 05 Sep 2008 15:11:28 -0500, "James R. Jones" wrote:

This is a photo of some sort of aircraft engine that is displayed at the
Omniplex in Oklahoma City the caption beside the engine says they have
no idea what it is or where it came from other than it is a rotary
design. Anybody have any ideas?

Looks like a Wankel of some kind. Maybe a Curtiss-Wright RC2-60?