This Le Rhone 80 HP rotary aero engine was built by Ray Williams, of New York, in 2007. Ray built his Le Rhone to exact scale by using original factory drawings and parts from the full-size engine. His methods of fabrication followed suit with those of the full-size engine, but the challenges to scale it down to this size were intense. He commented that a 1/4 scale engine would be almost impossible to assemble or access with no room for fingers or tools. The engine has no master rod. Instead, he made a slipper ring to accommodate 9 rods with slipper shoes, and the cam pushes and then pulls the single rod for the exhaust and intake cycle.