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Bell 8081 - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000 Bell 8247 - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000 X-1 - Rocket Engine - USA - Lox/Kerosene propellant X-10 - Intermediate range cruise missile - (US Department of Defence Designation) - See Navaho X-11 - Test vehicle - - See Atlas X-12 - Test vehicle - - See Atlas X-15 - Air-launched rocketplane - USA X-15 - Space Project - Manned - Rocketplane X-15 Flight 138 - Manned spaceflight - X-15 program X-15 Flight 143 - Manned spaceflight - X-15 program X-15 Flight 150 - Manned spaceflight - X-15 program X-15 Flight 153 - Manned spaceflight - X-15 program X-15 Flight 174 - Manned spaceflight - X-15 program X-15 Flight 190 - Manned spaceflight - X-15 program X-15 Flight 191 - Manned spaceflight - X-15 program X-15 Flight 197 - Manned spaceflight - X-15 program X-15 Flight 62 - Manned spaceflight - X-15 program X-15 Flight 77 - Manned spaceflight - X-15 program X-15 Flight 87 - Manned spaceflight - X-15 program X-15 Flight 90 - Manned spaceflight - X-15 program X-15 Flight 91 - Manned spaceflight - X-15 program X-15 Pressure Suit - Spacecraft - Manned - Space Suits - USA - See MC-2 X-15/Blue Scout - Air-launched orbital launch vehicle - USA X-15A - Spacecraft - Manned - Spaceplane - USA X-15A-2 - Spacecraft - Manned - Spaceplane - USA X-15A-3 - Spacecraft - Manned - Spaceplane - USA X-15B - Spacecraft - Manned - Spacecraft - USA X-17 - All-solid orbital launch vehicle - USA (US Department of Defence Designation) - See RAM X-17 - Test vehicle - USA X-17 - Test vehicle - USA (US Department of Defence Designation) X-1A - Spacecraft - Manned - Rocketplane - USA X-1B - Spacecraft - Manned - Rocketplane - USA X-1D - Spacecraft - Manned - Rocketplane - USA X-1E - Spacecraft - Manned - Rocketplane - USA X-2 - Spacecraft - Manned - Rocketplane - USA X-20 Glider - Spacecraft - Manned - Spacecraft Module - - See Dynasoar Glider X-20A - Spacecraft - Manned - Spaceplane - USA - See Dynasoar X-220 - Rocket Engine - USA - Solid propellant X-23A - Spacecraft - Manned - Spaceplane - USA - See Prime X-241 - Rocket Engine - USA - Solid propellant X-248 - Rocket Engine - USA - Solid propellant X-248A - Rocket Engine - USA - Solid propellant - See X-248 X-24A - Spacecraft - Manned - Spaceplane - USA X-24B - Spacecraft - Manned - Spaceplane - USA X-24C - Spacecraft - Manned - Spaceplane - USA X-250 - Rocket Engine - USA - Solid propellant X-254 - Rocket Engine - USA - Solid propellant X-256 - Rocket Engine - USA - Solid propellant X-258 - Rocket Engine - USA - Solid propellant X-259 - Rocket Engine - USA - Solid propellant X-259A - Rocket Engine - USA - Solid propellant - See X-259 X-260 - Rocket Engine - USA - Solid propellant X-265 - Rocket Engine - USA - Solid propellant X-271 - Rocket Engine - USA - Solid propellant X-30 - Spacecraft - Manned - Spaceplane - USA X-30 - Winged orbital launch vehicle - USA X-30 - Winged orbital launch vehicle - USA (US Department of Defence Designation) X-33 - Winged rocketplane - USA X-33 - Winged rocketplane - USA (US Department of Defence Designation) X-34 - Spacecraft - Spaceplane - - USA X-34 - - (US Department of Defence Designation) X-34 - Air-launched orbital launch vehicle - USA X-34 - Air-launched orbital launch vehicle - USA (US Department of Defence Designation) X-37 - Spacecraft - Spaceplane - - USA X-38 - Spacecraft - Manned - Spaceplane - USA X-40 - Spacecraft - Spaceplane - - USA X-405 - Rocket Engine - USA - Lox/Kerosene propellant X-43 - Spacecraft - Spaceplane - - USA X-430 - Rocket Engine - USA - LF2/LH2 propellant X-8 - Rocket Engine - USA - Lox/LH2 propellant X-OP - SSTO orbital launch vehicle - USA - See SSX X-PLANES AND AERONAUTICS - Spacecraft - - - X-Prize - Spacecraft family X-Prize - Space Project - - X-ray Multi Mirror - Spacecraft - Astronomy - X-ray - Europe - See XMM X-Rocket - SSTO orbital launch vehicle - USA - See SSX X35AL-6000 - Rocket Engine - USA - X4 - Air-to-air missile - Germany X4-AL-1000 - Rocket Engine - USA - Nitric acid/Amine propellant X45ALD-4000 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR13 X45ALD-4000 - Rocket Engine - USA - Nitric acid/Amine propellant X60AL-1300 - Rocket Engine - USA - Nitric acid/Amine propellant X60ALD-4000 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR13 X60ALD-4000 - Rocket Engine - USA - Nitric acid/Amine propellant X90ALT-60000 - Rocket Engine - USA - Nitric acid/Amine propellant XASR-1 - Rocket Engine - USA - Nitric acid/aniline propellant XBQM-8F - Surface-to-air drone - - See Talos XBQM-8F - Surface-to-air drone - (US Department of Defence Designation) - See Talos XCAL-200 - Rocket Engine - USA - Nitric acid/Amine propellant - See 300LR-200 XCALR-2000A-1 - Rocket Engine - USA - Nitric acid/Amine propellant XCALT-6000 - Rocket Engine - USA - Nitric acid/Amine propellant XCNLT-1500 - Rocket Engine - USA - Isopropylnitrate propellant XCNLT-600/1000/1500 - Rocket Engine - USA - Isopropylnitrate propellant - See XCNLT-1500 Xerus - Spacecraft - Manned - Spaceplane - USA XF-91 - Spacecraft - Manned - Rocketplane - USA XF-99 - - - See Bomarc Xichang - Orbital Launch Site in China. Xie Guangxuan - Xie Guangxuan - Chinese Engineer - XIM-70 - rocket - See Talos XIPS-13 0.44 kW - Rocket Engine - USA - Electric/Xenon propellant XIPS-25 1.3 kW - Rocket Engine - USA - Electric/Xenon propellant XIPS-25 4.2 kW - Rocket Engine - USA - Electric/Xenon propellant XLIM-49A - Anti-ballistic missile - USA (US Department of Defence Designation) - See Nike Zeus XLR1-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See 25AL-1000 XLR105-5 - Rocket Engine - USA - Lox/Kerosene propellant - See LR105 XLR11 - Rocket Engine - USA - Lox/Alcohol propellant - See LR11 XLR11-RM-1 - Rocket Engine - USA - Lox/Alcohol propellant - See LR11 XLR13-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See X60ALD-4000 XLR13-AJ-3 - Rocket Engine - USA - Nitric acid/Amine propellant - See X45ALD-4000 XLR13-AJ-5 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR13 XLR13-AJ-7 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR13 XLR132 - Rocket Engine - USA - N2O4/MMH propellant - See LR132 XLR15-AJ-1 - Rocket Engine - USA - Isopropylnitrate propellant - See XCNLT-1500 XLR16-AJ-1 - Rocket Engine - USA - - See LR16 XLR17-CW-1 - Rocket Engine - USA - Lox/Gasoline propellant - See LR17 XLR19-CW-1 - Rocket Engine - USA - Lox/Gasoline propellant - See LR19 XLR2-RM-1 - Rocket Engine - USA - - See LR2 XLR20-AJ-2 - Rocket Engine - USA - Nitric acid/Gasoline propellant - See LR20 XLR20AJ-2 - Rocket Engine - USA - Nitric acid/Gasoline propellant - See LR20 XLR21-CW-1 - Rocket Engine - USA - Lox/Gasoline propellant - See LR21 XLR22-RM-1 - Rocket Engine - USA - - See LR22 XLR23-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See X90ALT-60000 XLR24-AJ-2 - Rocket Engine - USA - Nitric acid/Gasoline propellant - See LR24 XLR24AJ-2 - Rocket Engine - USA - Nitric acid/Gasoline propellant - See LR24 XLR25-CW-1 - Rocket Engine - USA - Lox/Alcohol propellant - See LR25 XLR26-RM-1 - Rocket Engine - USA - - See LR26 XLR27-CW-1 - Rocket Engine - USA - - See LR27 XLR29-CW-1 - Rocket Engine - USA - - See LR29 XLR3-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See 25XALD-1000 XLR30-RM-2 - Rocket Engine - USA - Lox/Ammonia propellant - See LR30 XLR31-K-1 - Rocket Engine - USA - - See LR31 XLR32-RM-1 - Rocket Engine - USA - - See LR32 XLR33-RM-1 - Rocket Engine - USA - - See LR33 XLR35-RM-1 - Rocket Engine - USA - - See LR35 XLR37-CW-1 - Rocket Engine - USA - Lox/Gasoline propellant - See LR37 XLR39-RM-1 - Rocket Engine - USA - Lox/Alcohol propellant - See LR39 XLR40-RM-1 - Rocket Engine - USA - H2O2/Kerosene propellant - See LR40 XLR41-NA-1 - Rocket Engine - USA - - See LR41 XLR42-NA-1 - Rocket Engine - USA - - See LR42 XLR43-NA-1 - Rocket Engine - USA - Lox/Alcohol propellant - See LR43 XLR48-RM-1 - Rocket Engine - USA - - See LR48 XLR49-AJ-1 - Rocket Engine - USA - - See LR49 XLR5-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See 40ALD-3000 XLR51-AJ-1 - Rocket Engine - USA - - See LR51 XLR53-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR53 XLR53AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See LR53 XLR54-NA-1 - Rocket Engine - USA - H2O2/Kerosene propellant - See LR54 XLR55-?-1 - Rocket Engine - USA - - See LR55 XLR6-RM-1 - Rocket Engine - USA - - See LR6 XLR65-B-1 - Rocket Engine - USA - - See LR65 XLR7-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See XCALT-6000 XLR71-NA-1 - Rocket Engine - USA - Lox/Alcohol propellant - See LR71 XLR81-BA - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000 XLR81-BA-13 - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000 XLR83-NA-1 - Rocket Engine - USA - Lox/Kerosene propellant - See LR83 XLR89-1 - Rocket Engine - USA - Lox/Kerosene propellant - See LR89 XLR89-5 - Rocket Engine - USA - Lox/Kerosene propellant - See LR89 XLR9-AJ-1 - Rocket Engine - USA - Nitric acid/Amine propellant - See X4-AL-1000 XLR99 - Rocket Engine - USA - Lox/Ammonia propellant - See LR99 XM-270 - Tactical ballistic rocket - USA - See MLRS XM-28 - Tactical ballistic rocket - USA - See Davy Crockett XM-29 XM-388 - Tactical ballistic rocket - USA - See Davy Crockett M-28 XM-42 - Rocket Engine - USA - Solid propellant XM-45 - Rocket Engine - USA - Solid propellant XM-51 - Rocket Engine - USA - Air/Kerosene propellant XMGM-52B - - (US Department of Defence Designation) - See Lance XMGM-52B - rocket - See Lance XMM - Spacecraft - Astronomy - X-ray - Europe XMM-Newton - Spacecraft - Astronomy - X-ray - Europe - See XMM XOV - Spacecraft - Manned - Spaceplane - USA - See Blackstar XP-79 - Spacecraft - Manned - Rocketplane - USA XP-92 - Spacecraft - Manned - Rocketplane - USA XR2P1 - Rocket Engine - USA - Nitrous oxide/Alcohol propellant XR3A2 - Rocket Engine - USA - Lox/Alcohol propellant XR3B4 - Rocket Engine - USA - Nitrous oxide/Alcohol propellant XR3M9 - Rocket Engine - USA - Lox/CH4 propellant XR4A3 - Rocket Engine - USA - Lox/Alcohol propellant XR4K14 - Rocket Engine - USA - Lox/Kerosene propellant XR4K5 - Rocket Engine - USA - Lox/Kerosene propellant XR5M12 - Rocket Engine - USA - Lox/CH4 propellant XR5M15 - Rocket Engine - USA - Lox/CH4 propellant XRM-89 - Suborbital launch vehicle - (US Department of Defence Designation) - See Scout XRM-90 - - (US Department of Defence Designation) - See Scout XRM-91 - Suborbital launch vehicle - (US Department of Defence Designation) - See Scout XS-1 - Spacecraft - Manned - Rocketplane - USA XS-2 - Spacecraft - Manned - Rocketplane - USA - See X-2 XSM-64 - Intermediate range cruise missile - (US Department of Defence Designation) - See Navaho XSS - Spacecraft - Technology - Rendezvous - USA XSSM-A-2 - Intermediate range cruise missile - - See Navaho XSSM-A-4 - Intermediate range cruise missile - - See Navaho XTE - Spacecraft - Astronomy - X-ray - USA Xue Lun - Xue Lun - Chinese Manager - Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2008 except where otherwise noted.