Phelixian, you are incorrect. The sonic boom is due to a pressure wave passing you from object moving at supersonic speeds. It's continuous, not unlike the bow wave of a boat.

http://en.wikipedia.org/wiki/Sonic_boom

Otherwise, supersonic planes like the old Concorde would have been allowed over populated areas.

The boom occurs when it passes from sub to supersonic. After that the only way to tell it that the sound is trailing the plane as an audible ghost. It was definitely traveling supersonic.

I don't think that was supersonic: no sonic boom.

Probably video editting.

It was travelling WAY too slowly to be supersonic. Just look at the scale of the boats. I'm guessing it was either some jet boat editted, or else the water vapor above the lake was being vaporized around teh jet flames/low pressure?

There's no way to tell by the cone. Stop arguing about stuff you don't know.

Vapor cones appear at transonic speeds(about Mach .8 - 1.2) AND supersonic speeds. The appearance of the vapor cloud largly depends on the ambient moisture content and air temperature.

OK, this song was stolen from Fergie, (as noted), BUT, Fergie stole it first from JJ Fad, an all girl rap group from the 80's. they put out one album and disbanded after one year! (Yup, I had the cassett Tape - Im Def, lol)

"Supersonic", their hit of 1988, and their song "Eenie Meenie Beats" was re-worked by Fergie into her single "Fergalicious" -Wikipedia
http://www.videosift.com/video/JJ-Fad-Supersonic

>> ^K0MMIE:
so why would it be a double boom?

In smooth flight, the shock wave starts at the nose of the aircraft and ends at the tail. Because directions around the aircraft's direction of travel are equivalent, the shock forms a cone with the aircraft at its tip. The half-angle (between direction of flight and the shock wave ) A is given by sin(A) = 1/M, where M is the plane's Mach number. So the faster it goes, the finer, more pointed the cone. There is a sudden rise in pressure at the nose, decreasing steadily to a negative pressure at the tail, followed by a sudden return to normal pressure after the object passes. This "overpressure profile" is known as an N-wave because of its shape. The "boom" is experienced when there is a sudden change in pressure, so the N-wave causes two booms, one when the initial pressure rise from the nose hits, and another when the tail passes and the pressure suddenly returns to normal. This leads to a distinctive "double boom" from supersonic aircraft. When maneuvering, the pressure distribution changes into different forms, with a characteristic U-wave shape.

>> ^Pooterius:
Does anyone know at what point in the video the shuttle goes trans-sonic? There seem to be a few audio discontinuities, but it might be supersonic at the beginning of the video.



By 20 seconds into the flight, the shuttle has completed it roll and is accelerating through the atmosphere at about a 78 degree angle. Stress on the shuttle caused by its speed through the atmosphere is further relieved by powering back the main engines. By 45 seconds into the flight, the shuttle breaks the sound barrier. A minute into the flight, the pressure on the orbiter decreases and so the shuttle engines are returned to full power. At this point, the shuttle is traveling at an incredible 1,609 kilometers per hour (1,000 mph) or about Mach 1.5. By the end of the next minute, it will triple this speed!

Does anyone know at what point in the video the shuttle goes trans-sonic? There seem to be a few audio discontinuities, but it might be supersonic at the beginning of the video.

dupe

http://www.videosift.com/video/Angry-Kitty-vs-SuperSonic-Toothbrush

*discard

Mmm, gotta love supersonic nuclear bombers. The hull is white so the bomb flash won't ignite it you know. Little tidbit of info there.

I think i'll go find an Avro Vulcan video to sift...

>> ^SaNdMaN:
>> ^GeeSussFreeK:
Doesn't look like it went supersonic, almost, but not quite.

You can tell it's supersonic because you can't hear it until it reaches you.


It is near super sonic for sure, you can even hear small compression blasts after it passes, but it isn't quite there

>> ^GeeSussFreeK:
Doesn't look like it went supersonic, almost, but not quite.


You can tell it's supersonic because you can't hear it until it reaches you.

>> ^EDD:
>> ^GeeSussFreeK:
Doesn't look like it went supersonic, almost, but not quite.

Don't know about you, but my indication for whether something's gone over the sound barrier usually is the sound it makes


hahaha! Well this is one of the rare cases where you can see it as well as the vapor is an indication that the compressed air hasn't pushed its way off the tail of the plane causing the boom your talking about

>> ^GeeSussFreeK:
Doesn't look like it went supersonic, almost, but not quite.


Don't know about you, but my indication for whether something's gone over the sound barrier usually is the sound it makes