Alan and I were talking yesterday about the possibility of using a Wankel Rotary engine in an aircraft. Well, it appears it has been done:
MISTRAL Engines offers a family of liquid-cooled rotary-piston engines for light aircraft. The powerplants are built around a rotary, Wankel-type engine core, with a planetary reduction gear and a fully redundant Digital Engine Management (DEM) system designed to meet certification standards.
Real World Solutions Inc. was formed for the purpose of developing cost effective information and products for converting the Mazda rotary engine for aircraft use. (We are NOT a "fire wall forward" manufacturer, however.) The rotary is uniquely qualified for this use due to its high power-to-weight ratio and reliability at high power settings.