9 cylinder radial aero engine by Technopower of Santa Ana, California, based on the 1930's Armstrong-Siddeley Genet engine. 9 inch diameter, glo-plug ignition 4-stroke.
This engine has been test run once, since when it has been on display - it has never been in a plane, let alone left the ground!
Capacity 66.5 cubic centimetres/4.0 cubic inch