Supersonic Bizjet Will Be Low-Boom, Says Spike As preliminary design progresses, startup Spike Aerospace is increasingly confident that its S-512 supersonic business jet will meet its target for a low-sonic-boom noise level. “Current thinking is that the sonic-boom noise must be at or below 70 PLdB at ground level,” says Anutosh Moitra, chief technology officer. “Our initial studies have shown we are at 75 dB, which is acceptable, but we hope to get down to 70 ...

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