Then came a three-rotor, which first appeared in the Eunos Cosmo, before peaking with the massively powerful four-rotor in the 787B Le Mans race car, one of the greatest rotary engines ever ...

Rotary engines (also known as Wankel engines and Wankel rotary engines) are quite different from piston or "reciprocating" engines. One of the distinguishing features is that they don't need ...