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1 History and regulations

• 1949 July 8 first regulations
  • length: up to 2.8 m
  • width: up to 1 m
  • height: up to 2 m
  • engine displacement: up to 150 cm³ ( 4 strokeThe four-stroke cycle of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today ( cars and trucks, generators, etc). It was invented by Nikolaus Otto in 1876, and is also called the Otto cycle . The cycl), up to 100 cm³ ( 2 strokeThe two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear movements of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still)
• 1950Events January January 5 US Senator Estes Kefauver introduces a resolution calling for examination of organized crime in the USA January 6 The United Kingdom recognizes the People's Republic of China. The Republic of China severs diplomatic relations with July 26July 26 is the 207th day (208th in leap years) of the year in the Gregorian Calendar, with 158 days remaining. Events 1139 Afonso, then a count, is procclaimed first king of Portugal and declares independence from Castile 1469 Battle of Edgecote Moor 1788 major changes
  • length: up to 3 m
  • width: up to 1.3 m
  • displacement: up to 300 cm³ (4 stroke), up to 200 cm³ (2 stroke)
• 1951Events January events January 9 United Nations headquarters officially opens ( New York City). January 15 Ilse Koch, The "Witch of Buchenwald," wife of the commandant of the Buchenwald concentration camp, is sentenced to life imprisonment in a court in We August 16August 16 is the 228th day of the year (229th in leap years) in the Gregorian Calendar. There are 137 days remaining. Events 1777 American Revolutionary War: Battle of Bennington British forces are defeated by American troops. 1780 American Revolutionary minor changes
  • displacement up to 360 cm³ (4 stroke), up to 240 cm³ (2 stroke)
• 19551955 is a common year starting on Saturday. see link for calendar) Events January events January 2 Panama president Jose Antonio Remon is assassinated. January 19 The Scrabble board game debuts. February events February 8 Nikolai Bulganin ousts Georgi Mal April 4April 4 is the 94th day of the year in the Gregorian calendar (95th in leap years). There are 271 days remaining. Events 1581 Francis Drake completes a circumnavigation of the world and is knighted by Elizabeth I. 1721 Sir Robert Walpole enters office as minor changes
  • no further differentiation between 2 stroke and 4 stroke: all up to 360 cm³
• 1976 January 1 major changes
  • length: up to 3.2 m
  • width: up to 1.4 m
  • displacement: up to 550 cm³
• 1984 January 1 medium changes
  • length: up to 3.4 m
  • displacement: up to 660 cm³
• 1998 October 1 today's regulations
  • length: 3.4 m or less
  • width: 1.48 m or less
  • height: 2 m or less
  • displacement: 660 cm³ or less