Abstract
It is not the intention of this Theme Issue to include any discussion of the pros and cons of hypersonic flight; the existence of a large array of man-made satellites, which seems likely to increase rather than decrease, is a clear indication th at hypersonic flight is already with us and likely to stay with us. Since hypersonic speeds are in practice achieved by some form of chemical propulsion, which uses a good deal of fuel, it is im portant to strive for high efficiency. This in turn suggests that airbreathing engines have an important part to play, by avoiding the weight of the oxidant in comparison with rockets, and furthermore that good lift—drag ratios are im portant even for hypersonic vehicles by offering a wide choice of trajectory. It is these considerations that have led to the choice of hypersonic aerodynamics as the theme of this volume
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