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  • Streaking noise?

    I'm fairly sure this would have something to do with passing aircraft, but just wanted to confirm it or see if anyone else has experienced it and/or can explain why it happens.

    Sometimes when I'm out shooting approach, theres often this 'streaking' noise after an aircraft has flown over, usually happens 20-30 seconds after the plane has passed. (it's happened with jets and props). It seems like there's lightning ripping across the sky right above your head. Its only happened on cloudy days so far. Can anyone explain why it occurs?

  • #2
    Its the wing tip vortices...



    [photoid=5623246]

    If you look in that photo, from the winglets, those white lines... the theory behind them can be found here

    You might hear it more on cloudy days due to the moisture in the air, however you will hear them all the time if in the right spot and listen carefully enough

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    • #3
      It is amazing what you can hear from different aircraft types as well. 757s and DC10s/MD11s always seem to leave a lot of noise.

      Something which is also interesting to watch is when an aircraft approaches over the sea, like in Hong Kong. Often you can see streaks in the water where the vortices are blowing the surface of the sea, and sometimes you can even get small water spouts which can linger for up to a minute. It is amazing when you can visualise the disruption to the air which is normally invisible to us.
      Have a look at my photos, including Kai Tak crazy landings!http://www.jetphotos.net/showphotos.php?userid=460

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      • #4
        Originally I was looking for a video (though it may have been an animated GIF of a 747 flying over some smoke stacks going into Kai Tak, but here's what wake turbulence looks like for a dirty (flaps down, gear down, has nothing to do with how shiney the plane is), slow flying, 747 looks like if you add a little smoke to the mix. If I can find the video I'm looking for I'll come back and post it.

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        • #5
          Image above looks almost like a hurricane!
          Irfan Faiz Nazerollnizam. Computer geek and gamer

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          • #6
            Originally posted by screaming_emu
            Originally I was looking for a video (though it may have been an animated GIF of a 747 flying over some smoke stacks going into Kai Tak, but here's what wake turbulence looks like for a dirty (flaps down, gear down, has nothing to do with how shiney the plane is), slow flying, 747 looks like if you add a little smoke to the mix. If I can find the video I'm looking for I'll come back and post it.

            Is that for real? That 'one big swirl' doesn't seem to happen with fog or low clouds.

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            • #7
              sure it does

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              • #8
                Originally posted by screaming_emu
                sure it does

                Ok, I beleive you now

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                • #9
                  I have a friend in Juneau whos house is a couple hundred feet below the glide slope. When those wing tip vortices hit the trees they make an insane snapping and cracking. Even seen a crow get flipped upside down. I want to hear a 757s wing tip vortices in the trees.
                  You've got to try to find what's right before your eyes-Finger Eleven


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                  • #10
                    Yo Alec, when you were flying last summer (I think that's when it was) did you get to doing any steep turns? If you do them just right, you can actually hit your own wake turbulence. Its nothin too bad, just a nice little bump on the plane that lets you know you did it right. That still shows that even in a light aircraft such as a cessna or a piper how strong the turbulence can be if it sticks around long enough for you to do a 360 and then hit it again.

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                    • #11
                      Originally posted by screaming_emu
                      Yo Alec, when you were flying last summer (I think that's when it was) did you get to doing any steep turns? If you do them just right, you can actually hit your own wake turbulence. Its nothin too bad, just a nice little bump on the plane that lets you know you did it right. That still shows that even in a light aircraft such as a cessna or a piper how strong the turbulence can be if it sticks around long enough for you to do a 360 and then hit it again.
                      Yeah, that was last summer. We did do steep turns, but I dont remember hitting my wake turbulence. I remember lots of thermals on the return trip after practicing over the water.
                      You've got to try to find what's right before your eyes-Finger Eleven


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                      • #12
                        I frequently run in a park under the northbound approach to SEA and I have always loved that sound. To me, it sounds almost like tin foil being crinkled and ripped at the same time.


                        edit: MY 700th POST! I RULE.....well, nobody else was going to say it!
                        Last edited by wannabepilot777; 2006-01-16, 08:45. Reason: 700th post
                        THE VOICE OF REASON HAS SPOKEN!
                        Pop quiz: Which US president said, "Saddam Hussein has spent the better part of this decade, and much of his nation's wealth, not on providing for the Iraqi people, but on developing nuclear, chemical and biological weapons and the missiles to deliver them."
                        George W. Bush is not correct. It was Bill Clinton in his 1998 State of the Union speech. HMMMMMMMMM.

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                        • #13
                          Unforgetable sound. I have it recorded on my phone. Will download it soon !
                          Inactive from May 1 2009.

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                          • #14
                            Yesterday we were getting them from all sorts of aircraft... but mainly the 757s and the CRJ200s. I found the CRJs made the loudest and longest lasting ones out of them all... Pretty cool and it scares the kids

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                            • #15
                              Originally posted by andrew_c
                              Yesterday we were getting them from all sorts of aircraft... but mainly the 757s and the CRJ200s. I found the CRJs made the loudest and longest lasting ones out of them all... Pretty cool and it scares the kids
                              I think the 737's make the loudest noise. but yeah, the CRJ's is in that league too !
                              Inactive from May 1 2009.

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