Wankel received his first patent for the engine in 1929.
He began development in the early 1950s at NSU, completing a working prototype in 1957.
Some racing series have banned the Wankel altogether, along with all other alternatives to the traditional reciprocating-piston, four-stroke design. ==History== ===Early developments=== In 1951, NSU Motorenwerke AG in Germany began development of the engine, with two models being built.
He began development in the early 1950s at NSU, completing a working prototype in 1957.
In the United States in 1959, under license from NSU, Curtiss-Wright pioneered improvements in the basic engine design.
In Britain, in the 1960s, Rolls Royce's Motor Car Division pioneered a two-stage diesel version of the Wankel engine. Citroën did much research, producing the M35, GS Birotor, and [using engines produced by
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