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Mysterious Sonic Boom!


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#16    Oppono Astos

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Posted 22 October 2012 - 07:49 PM

View PostKryso, on 21 October 2012 - 09:10 PM, said:

It didn't sound like a sonic boom from a plane. Years ago in England, when the concord was about, one left an airport nearby and just as it sped up, at roughly 9 pm every night, it would created a sonic boom as it broke the sound barrier. This sound was move like the vibration of something hitting something solid.
Are you thinking of the Nocturnal Booms of the winter of 1976-77? We experienced them every Monday at 9.20pm local time, the effects were extremely localized; the difference between house-rattling rumbles, or merely hearing a boom, or hearing nothing at all was only a few 100s metres - very odd.  From the local media coverage, it was known that a village 10km west of here heard the boom 20 mins earlier than here - which makes little sense unless they were experiencing a totally different event each time.  People here used to go outside to await the boom, but nothing was ever seen, only the boom - although on occasion the boom was apparently coming from a specific point source in the sky.  One evening RAF Benson (then home of the Queen's Flight) went on alert as they thought the boom was an explosion/IRA attack - they clearly didn't interpret the boom as being caused by aircraft.
Concorde never went supersonic over land, and Concorde flew every day before, and for many years after, that winter.  The booms were always single, not double, AFAIK the only attempt to analyze/explain the booms was by Bristol University, who concluded that the booms were sonic booms being refracted from hundreds of km away.

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#17    Kryso

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Posted 23 October 2012 - 05:17 PM

View PostOppono Astos, on 22 October 2012 - 07:49 PM, said:

Are you thinking of the Nocturnal Booms of the winter of 1976-77? We experienced them every Monday at 9.20pm local time, the effects were extremely localized; the difference between house-rattling rumbles, or merely hearing a boom, or hearing nothing at all was only a few 100s metres - very odd.  From the local media coverage, it was known that a village 10km west of here heard the boom 20 mins earlier than here - which makes little sense unless they were experiencing a totally different event each time.  People here used to go outside to await the boom, but nothing was ever seen, only the boom - although on occasion the boom was apparently coming from a specific point source in the sky.  One evening RAF Benson (then home of the Queen's Flight) went on alert as they thought the boom was an explosion/IRA attack - they clearly didn't interpret the boom as being caused by aircraft.
Concorde never went supersonic over land, and Concorde flew every day before, and for many years after, that winter.  The booms were always single, not double, AFAIK the only attempt to analyze/explain the booms was by Bristol University, who concluded that the booms were sonic booms being refracted from hundreds of km away.

I have heard of that event before. Sounds interesting.

The concord use to hit supersonic as it his the English Channel, and because we lived near the coast, we got the boom. Same time for years. I was about 15 then, so that would have been around 1988 ish.


#18    justcalmebubba

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Posted 24 October 2012 - 03:00 PM

lol  oh im sorry i'll send out a warning memo next time i drop a oboma  and flush the pipes....j/k...lol





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