Mushure mekunge ndege yeAir Force Research Laboratory (AFRL) yatanga chirongwa cheHyTECH chehypersonic propulsion mumakore ekuma1990, Pratt & Whitney vakagamuchira chibvumirano kubva kuAFRL kuti vagadzire injini yehydrocarbon-fueled scramjet iyo yakatungamira mukugadzirwa kweinjini yeSJX61. Injini yeSJX61 pakutanga yaive yeNASA X-43C, iyo yakazokanzurwa. Injini iyi yakashandiswa kuAFRL's Scramjet Engine Demonstrator chirongwa mukupera kwa2003.
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