Mach cut-off is a regime of supersonic flight where an aircraft flies just slightly supersonic, perhaps Mach 1.0 to 1.15, at altitudes where the sonic boom never reaches the ground.  Some companies would like to operate civilian supersonic aircraft at these speeds over land.  To assess the technical viability and public acceptability of this concept, ASCENT Project 42 is conducting research to provide a basis of feasibility for an FAA noise determination.  This project is examining Mach cut-off sonic boom propagation through realistic atmospheric conditions, determining appropriate noise metrics to predict annoyance due to Mach cut-off sounds, assessing the potential for laboratory-scale measurements, and providing technology assessment for industry.

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Last Updated: 06/08/2017