engine cylinders is commonly found in either single-cylinder or coupled in groups of two, and cylinders are commonly oriented in a horizontal fashion as a Flat engine, while vertical Straight-four engine have been used. Examples of past air-cooled road vehicles, in roughly chronological order, include: Franklin (1902-1934) New Way (1905) - limited production run out from the "CLARKMOBILE" Chevrolet Series M Copper-Cooled (1921-1923) (very few built) Tatra all-wheel-drive military trucks Tatra 11 (1923-1927) and subsequent models Tatra T77 (1934-1938) Tatra T87 (1936-1950) Tatra T97 (1936-1939) Tatra T600 Tatraplan (1946-1952) Tatra T603 (1955-1975) Tatra T613 (1974-1996) Tatra T700 (1996-1999) Crosley (1939-1945) The East German Trabant (1957-1991) Trabant 500 (1957-1962) Trabant 600 (1962-1965) Trabant 601 (1964-1989) ZAZ Zaporozhets (1958-1994) Fiat 500 (1957-1975) Fiat 126 (1972-1987) Porsche 356 (1948-1965) Porsche 911 (1964-1998) Porsche 912 (1965-1969, 1976) VW-Porsche 914 (1969-1976) The Volkswagen Beetle, Type 2, SP2, Karmann Ghia, and Type 3 all utilized the same air-cooled engine (1938-2013) with various displacements Volkswagen Type 2 (T3) (1979–1982) Volkswagen Type 4 (1968-1974) Volkswagen Gol (G1) (1980-1986) Toyota U engine (1961-1976) Chevrolet Corvair (1960-1969) Citroën 2CV (1948-1990) (Featured a high pressure oil cooling system, and used a fan bolted to the crankshaft end) Citroën GS and GSA Honda 1300 (1969-1973) NSU Prinz Royal Enfield Motorcycles (India): The 350cc and 500cc Twinspark motorcycle engines are air-cooled Oltcit Club (1981–1995)T13/653, G11/631 and VO36/630 Demak Dzm 200 2015 Aviation Most aviation piston engines are air-cooled. While water cooled engines were widely used from the early days of flight, air cooled engines were the dominant choice in aircraft. Following the Second World War, turbojets and jet turbine powered aircraft have come to dominate flight regimes where water cooled piston engines offered the advantage of reduced drag. Today, piston engines are mostly used in slower general aviation aircraft where the greater drag produced by air cooled engines is not a major disadvantage. Therefore, most aero engines produced today are of the air cooled variety. Today, most of the engines currently (2005) manufactured by Lycoming and Continental are used by major manufacturers of light aircraft Cirrus, Cessna and so on. Other engine manufactures using air-cooled engine technology are ULPower and Jabiru, more active in the Light-Sport Aircraft (LSA) and ultralight aircraft market. Rotax uses a combination of air-cooled cylinders and liquid-cooled cylinder heads. Diesel engines Some small diesel engines, e.g. those made by Deutz AG and Lister Petter are air-cooled. Probably the only