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

Most car enthusiasts associate the term “rotary engine” with Felix Wankel’s invention, developed in the 1950s and most commonly associated with Mazda. However, more than half a century before the ...

The rotary engine was an unconventional design that delivered great power for its size. Here's what's good and bad about it.

Perfectly tuning the heat range of an engine's spark plugs is something of a dark art to all but the most well versed tuners and the engineering egg heads at automotive OEMs. Getting the spark plug ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Although numerous rotary aircraft ...

Long before Felix Wankel became synonymous with rotary engines, an inventive Hungarian-American engineer named Stephen M. Balzer secured one of the earliest patents for a rotary-powered automobile on ...