context: The Wankel Motor is a type of self-combustion motor and is in a circular motion in order to convert pressure into rotational motion rather than using bounce presses. The four strokes occur in a space between the oval-shaped container that resembles the superficial curve and the rotor that looks like a Rolo Triangle but with more flat sides. This design creates a high rotational force of compressed volume. Since its introduction, this engine has been considered a rotary engine, although this name has been applied to completely different designs. This engine was invented by German engineer Flex Wankel. It was patented in 1929, and developed in the early 1950s by NSU and the first working model was completed in 1957. [1] After that, NSU licensed the principle to companies around the world who in turn completed the development of this design. It is the only internal combustion engine that was invented in the twentieth century to go into production. Thanks to this design, the Wankel rotary motor is included in various devices and vehicles such as cars, motorcycles, racing cars, airplanes, automatic snowboarders, chainsaws and auxiliary power units. The most widely used car in Wankel is the Japanese company Mazda.
question: Who invented the rotary engine?
answers.text: Flex Wankel