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What's silent but violent and costs $250m? Yes, it's Lockheed Martin's super-quiet, supersonic X-plane for NASA

Doctor Syntax Silver badge

"The initial test flights ran up & down the Irish sea... It was very distinctive, but didn't seem loud enough to be a problem."

Agreed. I remember Shorts testing SkyVans at the more or less the same time. Ugly but if unladen I got the impression they'd be quite good at aerobatics.

"It was even better on the perimeter road at the end of the runway, when the reheat was still active. Made the world shake."

And if you were queued up behind one at take-off.

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