The impact of inlet unstart phenomena on supersonic transport (SST) was investigated by wind tunnel testing. Inlet unstart condition was simulated by controlling the captured mass flow by the inlet.

The second flight of the hypersonic Boeing X-51 waverider ended prematurely due to an inlet unstart. The aircraft made a controlled crash into the Pacific Ocean off the California coast on 13 June.

The unsteady flow and combustion phenomena leading up to unstart in a model scramjet engine were investigated through high-speed Schlieren visualizations using CAVILUX Smart laser and OH* ...

Unstart: An abrupt breakdown in inlet performance typically induced by adverse shock–boundary layer interactions, leading to flow separation and engine instability.

This is an account of a supersonic engine inlet failure, or “unstart,” recalled by retired reconnaissance systems officer Roger Jacks in SR-71 Revealed, a book by retired Lockheed SR-71 pilot ...