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. Power rating: 37 kw (50 hp) at 1,200 ...

Click to open image viewer. This somewhat unique artifact is an air-cooled, two-stroke cycle rotary aircraft engine designed and built by Paul Daniel of the Daniel Engine Company of Bound Brook, New ...