Abstract
In these days when it seems as if the steam engine of the 19 th century and the reciprocating type internal combustion engine have been developed to their peaks in all aspects, development of revolutionary engines based on principles entirely different from those of the conventional engines are being carried out actively?-aiming at an engine to be handed over to the next century.The following is a description of the NSU-Wankel rotary piston engine, which is said to be taking the lead in the development for industrialization among the various types of rotary piston engines, outlining the progress of development, principle, structure, and function of this distinctive engine.
