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X1 or X-1 may refer to:

  • Bell X-1, the first aircraft to exceed the speed of sound in controlled level flight
  • BMW X1, a BMW Compact Sports Activity Vehicle
  • HM Submarine X1, a Royal Navy submarine
  • McLaren X-1, a 2012 bespoke supercar created for an anonymous client and based on the McLaren MP4-12C
  • Red Bull X1, the former name of the Red Bull X2010, a fictional car created for the game Gran Turismo 5
  • SL X1, a former Swedish commuter train
  • Sinclair X-1, an electrically assisted faired recumbent bicycle
  • Wrightspeed X1, an electric sports car based on the Ariel Atom chassis
  • X-1 Submarine, the United States Navy's only midget submarine
  • X1 (dinghy), a fast, light-weight sailing dinghy designed for inland racing
  • XS-1 (spacecraft), a space plane in development
  • Yamaha X-1 and X-1R, related Yamaha underbone motorcycles

See also[edit]