Last Updated: April 27, 2011
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| Model | Designation | Manufacturer | Engine(s) | Crew | Other |
|---|---|---|---|---|---|
| X-1 | Bell | 1 Reaction Motors XLR11 | 1 | XS-1 | |
| X-1A | Bell | 1 Reaction Motors XLR11 | 1 | ||
| X-1B | Bell | 1 Reaction Motors XLR11-RM-6 | 1 | ||
| X-1C | Bell | none selected | 1 | cancelled | |
| X-1D | Bell | 1 Reaction Motors XLR11 | 1 | ||
| X-1E | Bell | 1 Reaction Motors LR8-RM-5 | 1 | ||
| X-2 | Bell | 1 Curtiss-Wright LR25-CW-1 | 1 | XS-2 | |
| X-3 | Stiletto | Douglas | 2 Westinghouse J34 | 1 | XS-3 |
| X-4 | Bantam | Northrop | 2 Westinghouse J30 | 1 | XS-4 |
| X-5 | Bell | 1 Allison J35-A-17 | 1 | XS-5 | |
| X-6 | Convair | 4 General Electric J53 | cancelled | ||
| X-7 | Lockheed | 1 Allegany Ballistics Lab X202-C3 and 1 ramjet | 0 | PTV-A-1, X-7A | |
| X-7A | Lockheed | 1 Allegany Ballistics Lab X202-C3 and 1 ramjet or 2 Thiokol XM45 and 1 ramjet | 0 | PTV-A-1, X-7 | |
| X-7B | Lockheed | 0 | |||
| X-8 | Aerobee | Aerojet General | 0 | RTV-A-1 | |
| X-8A | Aerobee | Aerojet General | 1 Aerojet General X103C10 and 1 Aerojet General AJ10-25 | 0 | RTV-A-1a |
| X-8B | Aerobee | Aerojet General | 0 | RTV-A-1b | |
| X-8C | Aerobee | Aerojet General | 1 Aerojet General AJ10-25 | 0 | RTV-A-1c |
| X-8D | Aerobee | Aerojet General | 0 | RTV-A-1d | |
| X-9 | Shrike | Bell | 1 Bell XLR65-BA-1 | 0 | RTV-A-4 |
| X-10 | North American | 2 Westinghouse J40-WE-1 | 0 | RTV-A-5 | |
| X-11 | Atlas A | Convair | 1 North American LR43 | 0 | |
| X-12 | Atlas B | Convair | 3 North American LR43 | 0 | |
| X-13 | Vertijet | Ryan | 1 Rolls-Royce J54 Avon | 1 | X-13A |
| X-13A | Vertijet | Ryan | 1 Rolls-Royce J54 Avon | 1 | X-13 |
| X-14 | Bell | 2 Armstrong Siddley ASV8J Viper | 1 | ||
| X-14A | Bell | 2 General Electric J85-GE-5/19 | 1 | ||
| X-14B | Bell | 2 General Electric J85-GE-5/19 | 1 | ||
| X-15 | North American | 1 Reaction Motors LR99 | 1 | X-15A | |
| X-15A | North American | 1 Reaction Motors LR99 | 1 | X-15 | |
| X-16 | Bell | 2 Pratt & Whitney J57 | |||
| X-17 | Lockheed | 1 Thiokol XM20 Sergeant and 3 Thiokol XM19 Recruit, and 1 Thiokol XM19E1 Recruit | 0 | ||
| X-18 | Hiller | 2 Allison T40-A-14 and 1 Westinghouse J34 | 2 | ||
| X-19A | Curtiss-Wright | 2 Lycoming T55-L-7 | 2 | ||
| X-20 | Dynasoar | Boeing | none | X-20A | |
| X-20A | Dynasoar | Boeing | none | X-20 | |
| X-21 | Northrop | 2 General Electric J79-GE-13 | 5 | X-21A | |
| X-21A | Northrop | 2 General Electric J79-GE-13 | 5 | X-21 | |
| X-22A | Bell | 4 General Electric T58-GE-8D | 2 | ||
| X-23A | Martin Marietta | none | 0 | ||
| X-24A | Martin Marietta | 1 Reaction Motors XLR11-RM-13 | 1 | ||
| X-24B | Martin Marietta | 1 Reaction Motors XLR11-RM-13 | 1 | ||
| X-25 | Bensen | 1 McCulloch 4318E | 0 | ||
| X-25A | Bensen | 1 McCulloch 4318E | 1 | ||
| X-25B | Bensen | 1 McCulloch 4318E | 1 | ||
| X-26A | Frigate | Schweizer | none | 1 | |
| X-26B | Frigate | Schweizer/Lockheed | 1 Continental O-200A | 2 | |
| X-27A | Lancer | Lockheed | 1 Pratt & Whitney TF30-PW-100 | 1 | cancelled |
| X-28A | Osprey | Pereira | 1 Continental C90-12 | 1 | |
| X-29A | Grumman | 1 General Electric F404-GE-400 | 1 | ||
| X-30A | National Aerospace Plane | none selected | 2 | cancelled | |
| X-31A | Rockwell/MBB | 1 General Electric F404-GE-400 | 1 | ||
| X-32A | Boeing | 1 Pratt & Whitney F119-SE-614 | 1 | ||
| X-32B | Boeing | 1 Pratt & Whitney F119-SE-614 | 1 | ||
| X-32C | Boeing | 1 Pratt & Whitney F119-SE-614 | 1 | ||
| X-33A | Lockheed Martin | 2 Rocketdyne XRS-2200 | 0 | cancelled | |
| X-34A | Orbital Sciences/Rockwell | 1 Marshall Spaceflight Center MC-1 Fastrac | 0 | cancelled | |
| X-34B | Orbital Sciences/Rockwell | 0 | cancelled | ||
| X-35A | Lockheed Martin | 1 Pratt & Whitney F119-SE-611 | 1 | ||
| X-35B | Lockheed Martin | 1 Pratt & Whitney F119-SE-611 | 1 | ||
| X-35C | Lockheed Martin | 1 Pratt & Whitney F119-SE-611 | 1 | ||
| X-36A | McDonnell Douglas | 1 Williams Research F112-WR-100 | 0 | ||
| X-37A | Future-X | Boeing | 1 Rocketdyne AR2-3 | ||
| X-37B | Future-X | Boeing | |||
| X-38A | Scaled Composites | none | |||
| X-40A | Space Maneuver Vehicle | Boeing | none | 0 | |
| X-40B | Space Maneuver Vehicle | Boeing | none | 0 | |
| X-41A | |||||
| X-42A | |||||
| X-43A | Hyper-X | MicroCraft/Boeing | 1 General Applied Science Laboratory (GASL) scramjet | 0 | |
| X-43B | Hyper-X | 1 Marshall Spaceflight Center ISTAR engine | 0 | cancelled | |
| X-43C | Hyper-X | Allied Aerospace Industries | 1 Pratt & Whitney HyTECH engine | 0 | cancelled |
| X-43D | Hyper-X | 0 | |||
| X-44A | Lockheed Martin/Pratt & Whitney | ||||
| X-45A | Boeing | 1 Garrett F124-GA-100 | 0 | ||
| X-45B | Boeing | 1 General Electric F404-GE-102D | 0 | cancelled | |
| X-45C | Boeing | 1 General Electric F404-GE-102D | 0 | ||
| X-46A | Boeing | 0 | |||
| X-47A | Pegasus | Northrop Grumman | 1 Pratt & Whitney Canada JT15D-5C | 0 | |
| X-47B | Pegasus | Northrop Grumman | 1 Pratt & Whitney F100-PW-220E | 0 | |
| X-48A | NASA Langley Research Center/Boeing | 3 Williams International WJ24-8 | 0 | ||
| X-48B | Boeing/Cranfield University | 3 JetCat P200 | 0 | ||
| X-48C | Boeing/Cranfield University | 2 JetCat P200 | 0 | ||
| X-49A | Sikorsky/Piasecki | 2 General Electric T700-GE-401C | |||
| X-50A | Dragonfly | Boeing | 1 Williams F112 | 0 | |
| X-51A | Waverider | Boeing/Pratt & Whitney | 1 rocket and 1 Pratt & Whitney Rocketdyne SJY-61-1 | 0 | |
| X-53A | Boeing | 2 General Electric F404-GE-400 | 1 | ||
| X-54A | Gulfstream Aerospace | 2 Rolls-Royce Tay 651 | |||
| X-55A | Advanced Composite Cargo Aircraft | Lockheed Martin | 2 |
Web Formatting - Copyright 2011 Derek Bridges
Last Updated: April 27, 2011
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