Declassified Government Documents Available for Download

The "X"-Planes


The X-planes are a series of experimental United States aircraft (and some rockets) used for testing of new technologies and usually kept highly secret during development.

Below is a listing with relevent documents for each.


The X-5 (Bell Aircraft)

  1.  The Bell X-5 Research Aircraft [67 Pages]


The X-20 "Dyna-Soar" (Boeing)

The X-20 Dyna-Soar ("Dynamic Soarer") was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including reconnaissance, bombing, space rescue, satellite maintenance, and sabotage of enemy satellites. The program ran from 24 October 1957-10 December 1963, cost US$660 million, and was canceled just after spacecraft construction had begun.


  1. Strangled Infant: The Boeing X-20A Dyna-Soar by Clarence Geiger
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03.23.2010 (1624 days ago)
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The "X"-Planes