HouseHobbit
Charter Member
The Concorde, and the Sr 71.. They both on take off scream like the dogs of Hell..
Very loud..OUCH..
Very loud..OUCH..

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The Staff of SOH
On the ground "run ups", the prototypes could reportedly be heard 25 miles (40 km) away.
the XF-84H's propeller traveled faster than the speed of sound even at idle thrust, producing a continuous visible sonic boom that radiated laterally from the propellers for hundreds of yards. The shock wave was actually powerful enough to knock a man down; an unfortunate crew chief who was inside a nearby C-47 was severely incapacitated during a 30-minute ground run.
In one report, a Republic engineer suffered a seizure after close range exposure to the shock waves emanating from a powered-up XF-84H.