List of experimental aircraft
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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. The X-plane series of experimental aircraft is one of the most well-known groups of such planes.
X-planes
- Bell X-1
- Bell X-2
- Douglas X-3 Stiletto
- Northrop X-4 Bantam
- Bell X-5
- Convair X-6
- Lockheed X-7
- Aerojet General X-8
- Bell X-9 Shrike
- North American X-10
- Convair X-11
- Convair X-12
- Ryan X-13 Vertijet
- Bell X-14
- North American X-15
- Bell X-16
- Lockheed X-17
- Hiller X-18
- Curtiss-Wright X-19
- Boeing X-20 Dyna-Soar
- Northrop X-21
- Bell X-22
- Martin-Marietta X-23
- Martin-Marietta X-24
- Bensen X-25
- Schweizer X-26 Frigate
- Lockheed X-27
- Pereira X-28 Sea Skimmer
- Grumman X-29
- Rockwell X-30
- Rockwell-MBB X-31
- Boeing X-32
- Lockheed Martin X-33
- Orbital Sciences X-34
- Lockheed Martin X-35
- McDonnell Douglas X-36
- Boeing X-37 Future-X
- Scaled Composites X-38
- X-39 - unused designation reserved for Future Aircraft Technology Enhancements programme
- Boeing X-40
- X-41 Common Aero Vehicle
- X-42 Pop-Up Upper Stage
- Boeing X-43
- Lockheed Martin X-44 MANTA
- Boeing X-45 UCAV
- Boeing X-46
- Northrop Grumman X-47 Pegasus
- Boeing X-48
- Sikorsky Piasecki X-49
- Boeing X-50
XB series
- North American XB-70 Valkyrie