Reply #55: Sound

[sgsmith]

But the sound is delayed. You just don't recognize it.

Bear with me here. Imagine a triangle, with one long side at the top, and two shorter lines at the bottom. Where the lines join at the bottom is the observer with a video camera. One end of the long side ends at the WTC building, the other ends somewhere on the flightpath. With me?

As the plane flys along the long line, the sound from the engines radiates all along the flight path and is heard at the point where the observer is at the bottom. That sound, of course, travels at the speed of sound, but there isn't anything to distinguish where along the flight path the sound is generated. Yes, there's a doppler shift, but because the cameras move to track the airplanes, and some of the videos are shot on very long distances, the doppler doesn't help in identifying where the airplane is.

It's only at the point of collision, where a unique sound (the explosion) is heard, that you can begin to localize where along the flight path the airplane is. And that sound is usally delayed from the visual of the explosion.

Yes, a lot of the video is crappy and full of artifacts. But who knows how much and how the video has been compressed from source to web links. Since most web videos are very small size, it stands to reason that a lot of compression has occurred.

Somewhere on this forum is a link to a hugh image file (two image files I believe) that capture the plane before it hits WTC2. I believe they're 16 MB apiece. Find that link and look at a good high resolution still, and it becomes clear that the airplane is real.