HIFiRE 5b is one of a series of 10 flight experiments under the Australia-US collaborative project Hypersonic International Flight Research and Experimentation (HIFiRE) program aimed at investigating physical phenomena of flight at more than five times the speed of sound. The knowledge gained from these experiments will be applied to develop future flight ramjets (scramjets). HIFiRE partners include the University of Queensland, Boeing, BAE Systems and DLR (German Aerospace Center).