The World's Weirdest Rotary Engine Is A 118-Year-Old French Spinner That Leaks Castor Oil Everywhere

Wankel rotary engine powered thousands of aircraft. One of several problems: It spewed castor oil on its pilots.
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Gnome Type N Rotary Engine

Click to open image viewer. The first successful rotary engine is generally attributed to the American F.O. Farwell in 1896; but the French Gnome, developed by the Seguin brothers, was much more ...