Abstract
This paper describes the theory of propagation of a sonic bang in a horizontally stratified atmosphere with wind, and the way in which this theory has been utilized to derive a computer program for finding, for an aircraft climbing and accelerating (normally along a straight line ground track), the location of the intersection of the bang wavefront with the ground. The locations of the ground focus line, along which there is a marked enhancement of the bang “overpressure” on the ground, are found for a large range of atmospheric structures. The feasibility of forecasting these locations, and the possibility of defining an area on the ground which would encompass all focus lines for a given flight plan, are also examined.
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