The internal combustion engine, for all its mechanical sophistication, still runs on a 19th-century mechanical idea: pistons rising and falling, a crankshaft spinning, a steam-age architecture ...
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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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