List of experimental aircraft

This is a list of experimental aircraft. Most aircraft are marked as experimental when they are first designed, so this list will focus on notable vehicles that never went into production and experimental variations of vehicles that were produced. This list will focus primarily on those aircraft that carried the "X" series designation or carried the "X" series designation as a prefix to a prototype, preproduction, or test aircraft.

US Designations

XA series

prototype or experimental attack aircraft

Douglas XA-26
Douglas XA-26A
Douglas XA-26B
XA-27 - not used
XA-28 - not used
XA-29 - not used
XA-30 - not used
Vultee XA-31A
Vultee XA-31B
Vultee XA-31C
Brewster XA-32
Brewster XA-32A
XA-33 - not used
XA-34 - not used
XA-35 - not used
XA-36 - not used
XA-33 - not used
Beech XA-38 Grizzly
XA-39 - not used
XA-40 - not used
Convair XA-41
XA-42 - not used
XA-43 - not used
XA-44 - not used
XA-45 - not used

XB series

Prototype or experimental bomber aircraft

North American XB-25E
North American XB-25F
North American XB-25G
Martin XB-27D
Martin XB-26H
Martin XB-27
North American XB-28
Boeing XB-29
Lockheed XB-30
Douglas XB-31
Consolidated XB-32 Dominator
Martin XB-33
Martin XB-33A Super Marauder
XB-34- not used; see B-34 Lexington
Northrop XB-35
Convair XB-36
XB-37 - not used; see B-37
Boeing/Lockheed Vega XB-38
Boeing XB-39
Boeing/Lockheed Vega XB-40
Consolidated XB-41
Douglas XB-42 Mixmaster
Douglas XB-43 Jetmaster
Boeing/Pratt & Whitney XB-44
North American XB-45 Tornado
Convair XB-46
Boeing XB-47 Stratojet
Martin XB-48
Northrop XB-49
XB-50 - not used
Martin XB-51
Boeing XB-52
Convair XB-53
XB-54- not used
Boeing XB-55
XB-56 - not used
XB-57 - not used
Convair XB-58 Hustler
Boeing XB-59
Convair XB-60
XB-61 - not used
XB-62 - not used
XB-63 - not used
XB-64 - not used
XB-65 - not used
XB-66 - not used
XB-67 - not used
Martin XB-68
XB-69 - not used
North American XB-70 Valkyrie
XB-71 - not used
XB-72 - not used
XB-73 - not used
XB-74 - not used
XB-75 - not used
XB-76 - not used
XB-77 - not used
XB-78 - not used

XC Series

XF Series

This series covers post-World War II fighter development when the newly independent USAF changed the "P" pursuit designation to "F" for fighter.

XF-80 - not used
Convair XF-81
XF-82 - not used
Bell XF-83
XF-84 - not used
McDonnell XF-85 Goblin
XF-86 - not used
Curtiss XF-87 Blackhawk
McDonnell XF-88
Northrop XF-89
Lockheed XF-90
Republic XF-91 Thunderceptor
Convair XF-92
XF-93 - not used
XF-94 - not used
XF-95 - not used
XF-96 - not used
XF-97 - not used
XF-98 - not used
XF-99 - not used
XF-100 - not used
XF-101 - not used
XF-102 - not used
Republic XF-103 Thunderwarrior
Lockheed XF-104
XF-105 - not used
XF-106 - not used
XF-107 - not used
North American XF-108
Bell XF-109
XF-110 - not used
XF-111 - not used
XF-112 - not used
XF-113 - not used
XF-114 - not used
XF-115 - not used
XF-116 - not used
XF-117 - not used

XP Series

This series covers fighter development up to the end of World War II. In 1947 the newly independent USAF changed the "P" pursuit designation to "F" for fighter.

Others

Experimental aircraft | Lists of aircraft

Liste von Versuchsflugzeugen | Aerei X