Wankel engine
Wankel rotary engine
epitrochoidal engine

Drehkolbenmotor - an early version of the Wankel rotary engine.

Another promising design for aircraft use was the Wankel rotary engine.

In an aircraft application, the power-to-weight ratio is very important, making the Wankel engine a good choice.

Recently, the Wankel engine has been developed for use in motor gliders where the small size, light weight, and low vibration are especially important.

Another type of internal combustion engine is the Wankel engine.

The combustion chamber of the Wankel engine is an epitrochoid.

A crude but complex example of the future Wankel engine.

Mazda was fully committed to the Wankel engine just as the energy crisis of the 1970s struck.

Originally the car was designed for a Wankel rotary engine.

It was not the normal reciprocal-piston deal; this one had a rotary Wankel engine.