Kurt, Google "speed of sound". ;) A pop heard half a second after burnout at an average temperature of 25 degrees C travels at approximately 346m/sec. If the event occurred at a altitude of 340 meters the pop would have happened 1/2 second before burnout and been heard half a second after (give or take the spedd of light). If burnout was higher it happened even earlier. Matt On Jun 14, 2012 6:08 PM, "Kurt Gugisberg" <kurtgug@xxxxxxxxxxxxx> wrote: > Richard, I heard it too. Seemed to me it was shortly after burnout which > makes it even more mysterious. I was watching the flight and, as far as I > can visualize it, the burn ended and and half second or more later, the > pop. > > Kurt > > -----Original Message----- > From: Richard Dierking ** > Sent: Jun 14, 2012 8:49 AM > To: roc-chat@xxxxxxxxxxxxx > Subject: [roc-chat] Re: Interested in Sonic Boom Sound > > Ok, glad that someone else heard this Mike! And yes, this sounds like a > very good explanation. I was a sharp pop and that's what surprised me. Do > you know who's rocket it was? Just wondering if there's video out there. > > Thank you, > Richard > > On Thu, Jun 14, 2012 at 12:29 AM, Mike Riss <rockt_dude@xxxxxxxxxxxxx>wrote: > >> Richard, >> >> I think I heard the same thing, and IIRC, I was standing in the safety >> zone at the time. Seemed like it was towards the end of the motor burn. >> It sounded pretty sharp to me. I was thinking it was that "liner getting >> expelled" that usually gets thrown out as an explanation for that type of >> sound. >> >> Mike >> >> --- On *Wed, 6/13/12, Richard Dierking <richard.dierking@xxxxxxxxx>*wrote: >> >> >> From: Richard Dierking <richard.dierking@xxxxxxxxx> >> Subject: [roc-chat] Interested in Sonic Boom Sound >> To: roc-chat@xxxxxxxxxxxxx >> Date: Wednesday, June 13, 2012, 8:20 AM >> >> During ROCstock after I was doing some maintenance on one of the back >> pads and was walking away, a rocket was launched. It was about a 4" >> diameter, and had a large enough motor to get it going *fast*. During >> the flight, I definitely heard a "pop" but it didn't coincide with any >> event I saw on the rocket. I thought that a sonic boom could only be heard >> if the cone created by the disturbance passed by you. So, what could this >> have been? I was thinking perhaps a sound generated by turbulence at the >> base of the rocket? >> >> Anyway, this is the first time I've heard this kind of sound and I wonder >> if someone has video that includes this "pop." >> >> Richard Dierking >> >> > ** > > -- ROC-Chat mailing list roc-chat@xxxxxxxxxxxxx > //www.freelists.org/list/roc-chat