North American X-15 Family (NA-240); Propulsion, Reaction Motors LR99 Liquid-Fuel Motor (XLR-99); Crossfield, Albert Scott "Scotty"; Boeing NB-52 Stratofortress (Mothership). [photograph]


Collection Item Summary:

Three-quarter right rear view, close up, of North American X-15 on the ground, mounted beneath the right wing of its Boeing NB-52 Stratofortress mothership. View shows the aircraft's Reaction Motors, Inc. 50,000 lb. thrust XLR-99-RM-1 Pioneer rocket engine. The man facing the camera at left foreground appears to be X-15 pilot Scott Crossfield.

Collection Item Long Description:


  • Research aircraft
  • Aeronautics
  • Aircraft
  • Airplanes
  • Propulsion systems
  • Rocketry

Data Source

National Air and Space Museum Archives

Restrictions & Rights

Material is subject to Smithsonian Terms of Use. Should you wish to use Smithsonian National Air and Space Museum (NASM) material in any medium, please submit an Application for Permission to Reproduce NASM Material, available at




Circa 1960s

Repository Loc.

National Air and Space Museum, Archives Division, MRC 322, Washington, DC, 20560



Local number


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