Experiments with the concept of the rotary engine continued. These are a form of pistonless rotary engine. Flying clothing worn by rotary engine pilots was routinely soaked with oil. Production began with a Millet motorcycle powered by a five-cylinder rotary engine. This was the only generation that had the rotary engine offered. Mazda is also the only company to win with a rotary engine. One major development was the intake system for the rotary engine. Mazda and Toyota announced they combined to produce a range extending rotary engine for vehicles. This was the only generation of the Familia that had the rotary engine offered. It is also known as a rotary engine. Foremost was the replacement of the 767's 13J Wankel rotary engine. An example of a pistonless rotary engine is the Wankel engine. The Atkinson cycle can be used in a rotary engine. A gerotor can also function as a pistonless rotary engine. Originally, the car was designed for a Wankel rotary engine.