Jenkins D.R., Landis T., Miller J. American X-Vehicles: An Inventory-X-1 to X-50

Washington: NASA, 2003. — 65 p. — (Monographs in Aerospace History No. 31)For a while, it seemed the series of experimental aircraft sponsored by the U. S. government had run its course. Between the late 1940s and the late 1970s, almost thirty designations had been allocated to aircraft meant to explore new flight regimes or untried technologies. Then, largely, it ended. But there was a resurgence in the mid- to late1990s, and as we enter the fourth year of the new millennia, the designations are up to X-50.Bell X-1 (First Generation
Bell X-1 (Second Generation)
Bell X-1E
Bell X-
Douglas X-
Northrop X-4
Bell X-5
Consolidated-Vultee X-6
Lockheed X-7
Aerojet General X-8
Bell X-9
North American X-10
Consolidated-Vultee X-11
Consolidated-Vultee X-12
Ryan X-13
Bell X-14
North American X-15
North American X-15A-2
Bell X-16
Lockheed X-17
Hiller X-18
Curtiss-Wright X-19
Boeing X-20
Northrop X-21A
Bell X-22
Martin Marietta X-23
Martin Marietta X-24A
Martin Marietta X-24B
Bensen X-25
Lockheed / Schweizer X-26
Lockheed X-27 Lancer
Pereira / Osprey X-28
Grumman X-29
National Team X-30
Rockwell International / MBB X-31
Boeing X-32
Lockheed Martin X-33
Orbital Sciences X-34
Lockheed Martin X-35
Boeing X-36
Boeing X-37
NASA X-38
AFRL X-39
Boeing X-40A
X-41
X-42
Microcraft X-43
Lockheed Martin X-44
Boeing X-45
Boeing X-46
Northrop Grumman X-47
Boeing X-48
X-49
Boeing X-50
Lifting Bodies
Douglas D-558