I roto i te 1990s, te Air Force Rangahau Laboratory (AFRL) tīmata te hōtaka HyTECH mō te pūkaha hypersonic. riro Pratt & Whitney he kirimana i te AFRL ki te whakawhanake i te pūkaha scramjet hauwai-kai i arahina ki te whanaketanga o te pūkaha SJX61. te SJX61 pūkaha i te tīmatanga tikanga mo te NASA X-43C, i te mutunga i whakakorea. i tono te pūkaha ki te hōtaka AFRL o Scramjet Engine Demonstrator i te mutunga o 2003. i tohua te waka scramjet whakamātautau rere X-51 i runga i 27 Mahuru 2005. pātai: He aha te mutunga o te hōtaka rererangi NASA X-43C?
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