The first C111 was finished in 1969 featuring a mid-mounted, three-rotor Wankel engine and fiberglass body shell. The next was in 1970 with a four-rotor engine that made 370 horsepower and had a top speed of 180 mph. This was followed by the C111-IID which marked a move to diesel engines that eventually broke speed records.
Engineers used a turbocharger with an 80-horsepower 5-cylinder engine and managed 190 horsepower. They took the car to the Nardo circuit in southern Italy in 1976 where it set some impressive records.
It spent an hour on the track with an average speed of 157.69 mph and continued setting speed records in successive tests.
Later iterations of the C111 managed to hit 200 mph in 1978 with a 500 horsepower version achieving an average lap speed of 250.958 mph on May 5, 1979.
The success of the C111 led Mercedes to introduce the C112 at the 1991 Frankfurt Motor Show. The V12 car was so well-received that 700 people put down deposits, but unfortunately Mercedes never put the car into production.