A German engineer, Felix Wankel, is credited with developing the world’s first rotary engine in the 1950s. Wankel rotary engines use a triangular rotor spinning in a semi-oval case on an eccentric shaft, unlike piston engines from the period. Apex seals in a Wankel rotary engine perform a similar function as piston rings in internal combustion piston engines. However, the weak link of the Wankel engine could lie with the apex seal.  The Wankel rotary engine found success in the automotive market.
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