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..

Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.

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.
