R4

From Wikipedia, the free encyclopedia

R4, R04, R.4, R-4, or R/4 may refer to:

Military[edit]

Aircraft[edit]

  • Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915
  • Curtiss R-4, air ambulance version of the American Curtiss Model R utility aircraft, first flown in 1915
  • Sikorsky R-4, American helicopter, first flown in 1942

Ships[edit]

Weapons[edit]

Other military[edit]

  • Plan R 4, the World War II British plan for an invasion of the neutral state of Norway in April 1940

Science[edit]

  • R4, designation of risk phrase "Forms very sensitive explosive metallic compounds"
  • R4 nuclear reactor, the fourth nuclear reactor built in Sweden
  • Exotic R4, in mathematics, a differentiable manifold

Transportation[edit]

Cars[edit]

Roads[edit]

Other transportation[edit]

Video games[edit]

Other uses[edit]

See also[edit]