The Quiet Supersonic Technology, also known as QueSST is a project in development by NASA and Lockheed Martin that is aimed to be a quieter replacement for the Concorde. After design review, the next stage is to test models in a wind tunnel. The ground noise is expected to be around 60 dB(A), about 1000 times quieter than current supersonic aircraft. This is achieved by using a long, narrow airframe and canards to keep the shock waves from coalescing.
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