Wankel rotary engine powered thousands of aircraft. One of several problems: It spewed castor oil on its pilots.

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This somewhat unique artifact is an ...

In a world dominated by pistons, the rotary engine was something different for motorists. It was the vision of German engineer Felix Wankel, built on the belief that the up-and-down motion of pistons ...