All the projects of supersonic transport have been cancelled because none of the projects comply with noise regulations. The purpose of this paper is to systematically review the acoustical properties and power performances of engines and ejectors. Based on this review we should be able to put together a realistic design solution. The model will be a collection of elementary models, which are based on first principles and empirical coefficients. The requirements are based on jet noises and margins are included for certain other noise sources, for example fan noises. Additionally, fixed and stowable engines have to be considered.
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