The NSU Ro 80 is a four-door, front-engine executive sedan manufactured and marketed by the West German firm NSU from 1967 until 1977. Noted for innovative, aerodynamic styling by Claus Luthe and a technologically advanced powertrain, the Ro 80 featured a , twin-rotor Wankel engine driving the front wheels through a semi-automatic transmission with an innovative vacuum-operated clutch system. Engine dimensions (Comotor units): length ; width , height , weight . Power at 6,500 rpm; torque at 3,000 rpm (all figures approximate). The Ro 80 was voted Car of the Year for 1968 and 37,398 units were manufactured over a ten-year production run, all in a single generation. Running gear Other technological features of the Ro 80, aside from the powertrain, were the four-wheel ATE Dunlop disc brakes, which were generally only featured on expensive sports or luxury saloon cars. The front brakes were mounted inboard, reducing the unsprung weight. The suspension was independent on all four wheels, with MacPherson struts at the front and semi-trailing arm suspension at the rear, both of which are space-saving designs commonly used today. Power-assisted ZF rack and pinion steering was used, again foreshadowing more recent designs. Transmission The car featured an automatic clutch which was commonly described as a three-speed semi-automatic gearbox: there was no clutch pedal, but instead, touching the gear lever knob operated an internal electric switch that operated a vacuum system which disengaged the clutch. The gear lever itself then could be moved through a standard "H-pattern" gate. Styling The styling, by Claus Luthe who was head of design at NSU and later BMW, was considered very modern at the time; the Ro 80 has been part of many gallery exhibits of modern industrial design. The large glass area foreshadowed the 1970s designs such as Citroën's. The shape was also slippery, with a drag coefficient of 0.355 (very low for the era). This allowed for a top speed of . Indeed, comparisons have been drawn between the design of the Ro 80 and the aerodynamic 1982 Audi 100 built in the same factory some 15 years later. Interior Interior trim combined cloth-covered seats with PVC headlining and a carpeted floor. Leather seats were a factory option, although rarely specified. Evolution The company's limited resources focused on improving the reliability of the rotary engine, with much attention given to the material used for the three rotor tips (apex seals) for the