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Lockheed L-301
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Lockheed L-301 (sometimes called the X-24C, though this designation was never officially assigned) was an experimental air-breathing hypersonic aircraft project. It was developed by the NASA and United States Air Force (USAF) organization National Hypersonic Flight Research Facility〔http://books.google.com/books?id=DUkl5bH6k6EC&pg=PA98&lpg=PA98&dq=National+Hypersonic+Research+Facility+x-15+x-24c&source=bl&ots=Ubvm4kazo1&sig=16Y5rv1y8HLZX8fy8mHZGmDBev4&hl=en&ei=7exrSujtNpLWM4a5tPkG&sa=X&oi=book_result&ct=result&resnum=3 (Secret Projects by Dennis R. Jenkins )〕 (NHFRF or NHRF〔http://www.darpa.mil/tto/solicit/BAA08-53/VULCAN_Industry_Day_Presentations.pdf (NHRF" )〕), with Skunk Works as the prime contractor. In January 1977, the program was "tentatively scheduled to operate two vehicles for eight years and to conduct 100 flights per vehicle."〔http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790008668_1979008668.pdf (DEVELOPMENT STUDY OF THE X-24C HYPERSONIC RESEARCH AIRPLANE - PHASE II )〕 NASA discontinued work on L-301 and NHRF in September 1977 due to budget constraints and lack of need.〔
==Development==
The L-301 HGV was intended to be a follow-on to the X-15 and X-24 (specifically the X-24B) programs, to take lessons learned from both and integrate them into an airframe capable of at least reaching Mach 8 and engaging in hypersonic skip-glide maneuvers for long range missions. While the NASA program, one of several to use the tentative X-24C designator, was ostensibly canceled in 1977, it was only canceled at the time because of USAF disclosures of duplicate black programs with the same contractors for similar vehicles. The vehicle used both air breathing ram or scramjet propulsion as well as a rocket engine, carrying both RP-1 and LH2 propellant as well as on board stores of LOX.
It is not known whether the black program ever resulted in flight tests, however wind tunnel models are well documented online by both Lockheed and USAF websites,〔(Arnold Air Force Base - Library )〕 while Lockheed drawings have appeared on the web,〔(Lockheed's X-24C (L-301) )〕 particularly on the sites of modelers producing models of this vehicle. Aviation historian Rene Francillion believes Lockheed did fly a testbed aircraft in 1982.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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