Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A cikin 1990s, Cibiyar Nazarin Jirgin Sama (AFRL) ta fara shirin HyTECH don propulsion na hypersonic. Pratt & Whitney sun sami kwangila daga AFRL don haɓaka injin scramjet mai amfani da hydrocarbon wanda ya haifar da ci gaban injin SJX61. An tsara injin SJX61 ne don NASA X-43C, wanda aka soke shi a ƙarshe. An yi amfani da injin a cikin shirin Scramjet Engine Demonstrator na AFRL a ƙarshen 2003. An sanya jirgin gwajin jirgin sama na scramjet X-51 a ranar 27 ga Satumba 2005.  Tambaya: Menene makomar shirin jirgin sama na NASA X-43C?
an soke shi