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Sound Of Wind After Landing?  
User currently offlineTimePilot From Switzerland, joined Sep 2005, 296 posts, RR: 0
Posted (5 years 6 months 1 week 3 days 13 hours ago) and read 4906 times:

Hello,

I went to the old Nagoya airport yesterday and hung around the park at the end of the runway. It was good timing because a C-130 of the Self-Defense Force was doing repeated touch-and-goes. I took this video of it flying overhead:

http://www.youtube.com/watch?v=poq3zOsmUcs&feature=channel_page

About 1 minute after I took this video, there was the sound of wind all around. It sounded like when you drive really fast and open the car window up a little bit. It lasted for about 10 seconds then stopped. I've also noticed the sounds after JAir CRJs come in, too.

What is that noise? Vortex winds?

Thanks in advance.

16 replies: All unread, jump to last
 
User currently offlineVikkyvik From United States of America, joined Jul 2003, 10036 posts, RR: 26
Reply 1, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 4885 times:
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Quoting TimePilot (Thread starter):
What is that noise? Vortex winds?

Probably.

Wingtip vortices (and flap tip vortices, really anywhere that there are symmetrical vortices on either side of the airplane) sink slowly aft of an aircraft, as each vortex pushes down on the other.

As the vortices near the ground, they start spreading out from each other as well.

I've never heard/felt vortices after an airplane has passed, but I'd imagine that's what it was, if there wasn't much wind or other possible sources of moving air. From the video, looks like you'd be in pretty good position to get the tip vortices from the left wing.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 2, posted (5 years 6 months 1 week 3 days 12 hours ago) and read 4869 times:



Quoting TimePilot (Thread starter):
What is that noise? Vortex winds?

Definitely. If you're close enough to the approach end of the runway you can definitely feel, and hear them.

A few nights ago I was taking night pictures at my local airport. The wind was dead calm. Then a a Horizon Q400 came in and just about 30 seconds later I heard the vortices and then about a minute later I felt the breeze, then everything went quiet again. I've found that bigger non-wingleted planes, and large prop-planes, tend to make interesting noises, sometimes you'll here clapping or whooshing sounds.

Quoting Vikkyvik (Reply 1):
I've never heard/felt vortices after an airplane has passed,

Really? And you call yourself an aviation enthusiast?  Yeah sure  Wink


User currently offlineVikkyvik From United States of America, joined Jul 2003, 10036 posts, RR: 26
Reply 3, posted (5 years 6 months 1 week 3 days 11 hours ago) and read 4865 times:
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Quoting FLY2HMO (Reply 2):

Really? And you call yourself an aviation enthusiast?

 grumpy 

I call myself an aerospace engineer. I sit in a cube in a dull room with flourescent lights and stare at my computer with my horn-rimmed glasses and pocket protector. The sun scares me.

 Wink



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 4, posted (5 years 6 months 1 week 3 days 11 hours ago) and read 4858 times:



Quoting Vikkyvik (Reply 3):
I call myself an aerospace engineer.

Ooohh well that explains a lot Big grin  duck   Wink


User currently onlineANITIX87 From United States of America, joined Mar 2005, 3305 posts, RR: 13
Reply 5, posted (5 years 6 months 1 week 3 days 11 hours ago) and read 4852 times:
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When I went to Billy Joel's concert at Shea Stadium last summer there was NO wind that night, and they were using runway 31, with the expressway visual at LGA. The planes were flying above the stadium before beginning their turn, and about two minutes later, an enormous breeze would sweep through the stadium. You could almost hear 50,000 people sigh in unison because it was so hot and muggy that evening.

TIS



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User currently offlineTimePilot From Switzerland, joined Sep 2005, 296 posts, RR: 0
Reply 6, posted (5 years 6 months 1 week 2 days 15 hours ago) and read 4643 times:

Thanks for the replies!  Smile

User currently offlineGST From United Kingdom, joined Jun 2008, 932 posts, RR: 0
Reply 7, posted (5 years 6 months 1 week 2 days 13 hours ago) and read 4578 times:

Just to chuck another possibility in the pot, a thermal could have gone through. You can get quite strong breezes inside a thermal, and often if they are narrow ones they may get strong enough to get quite loud, not to mention pass over about as fast as you said on many days.

Just putting it out there, but i would agree the most likely answer is still trailing vortecies.


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 59
Reply 8, posted (5 years 6 months 1 week 2 days 10 hours ago) and read 4540 times:
AIRLINERS.NET CREW
DATABASE EDITOR

Sounds like this is what happened, albeit on a smaller scale:

http://i41.tinypic.com/5lp2jr.jpg


I've heard the vorticies from an Avro RJ once. The jet passed overhead on short final, and about 15-30 seconds later, I could hear them. It almost sounded like two large lengths of wire being pulled taut against each other along the approach path. It was an echoing/tearing sound that seemed to travel very quickly back and forth along the approach path

2H4



Intentionally Left Blank
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3527 posts, RR: 66
Reply 9, posted (5 years 6 months 1 week 1 day 15 hours ago) and read 4390 times:



Quoting Vikkyvik (Reply 1):
I've never heard/felt vortices after an airplane has passed, but I'd imagine that's what it was,

If you play golf, play a round on a course near the end of a runway at a large airplane airport. There's one at the south end of SeaTac.

You'll hear and feel a lot of vortices.



Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offlineSoon7x7 From , joined Dec 1969, posts, RR:
Reply 10, posted (5 years 6 months 1 week 1 day 15 hours ago) and read 4372 times:

If you can get to JFK 13 left....they come right over...the plane will already be on the ground yet the air above you is tearing with nasty sounds...Always gives me visions of some poor sucker in a J-3 getting ripped apart by one of these...  spin 

User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 11, posted (5 years 6 months 1 week 1 day 14 hours ago) and read 4357 times:



Quoting 2H4 (Reply 8):
It almost sounded like two large lengths of wire being pulled taut against each other along the approach path. It was an echoing/tearing sound that seemed to travel very quickly back and forth along the approach path

Great description! That's exactly what they sound like.

Quoting OldAeroGuy (Reply 9):

If you play golf, play a round on a course near the end of a runway at a large airplane airport. There's one at the south end of SeaTac.

There's also a park at the north end of Boeing field that's fantastic for this (if they're on 13R)...the park is only a few hundred yards from the threshold.

Tom.


User currently offlineBa97 From Canada, joined Apr 2004, 377 posts, RR: 0
Reply 12, posted (5 years 6 months 1 week 1 day 14 hours ago) and read 4346 times:

Woodbine golf course in Toronto is a great place to have fun hearing them when planes are landing to the west on the south runway-although you do cause a delay in play because it is too much fun hearing them. The description of a wire being pulled/whipped is exactly the sound you hear. You sometimes hear a crack. You can hang out on the street next to the course and hear them but there is something about being on a golf course with the trees walking and hearing them in the silence of the course that makes them better.


there is economy class, business class, first class...then Concorde..pure class
User currently offlineVikkyvik From United States of America, joined Jul 2003, 10036 posts, RR: 26
Reply 13, posted (5 years 6 months 1 week 1 day 10 hours ago) and read 4309 times:
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Quoting OldAeroGuy (Reply 9):

If you play golf, play a round on a course near the end of a runway at a large airplane airport. There's one at the south end of SeaTac.

Ugh, trust me, I would love to! I do play golf, but sadly I don't know of any golf courses in the LA area that are near runway ends.

I have been to the In'n'Out by the 24R threshold plenty of times, but it might be a bit too far offset from the flight path to feel them. Plus it's pretty noisy over there.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineBuckfifty From Canada, joined Oct 2001, 1316 posts, RR: 19
Reply 14, posted (5 years 6 months 1 week 1 day 4 hours ago) and read 4259 times:



Quoting Ba97 (Reply 12):
Woodbine golf course in Toronto is a great place to have fun hearing them when planes are landing to the west on the south runway-although you do cause a delay in play because it is too much fun hearing them. The description of a wire being pulled/whipped is exactly the sound you hear. You sometimes hear a crack. You can hang out on the street next to the course and hear them but there is something about being on a golf course with the trees walking and hearing them in the silence of the course that makes them better.

If you're in the Wendy's parking lot while 23 is in use, you will definitely hear the shearing effects caused by the vorticies. In fact, if you look at the trees in the said parking lot, you will see that they grow a certain way...


User currently offlineBa97 From Canada, joined Apr 2004, 377 posts, RR: 0
Reply 15, posted (5 years 6 months 1 week 14 hours ago) and read 4123 times:

I will have to look at those trees at Wendys, never occurred to me- thanks. You get a multi set of thrills there in the afternoon with the Europe flights coming in and you see them approach over the light stands slowly growing in size, the low pass over, then the vortice sounds.


there is economy class, business class, first class...then Concorde..pure class
User currently offlineWNTex From United States of America, joined Jun 2008, 72 posts, RR: 0
Reply 16, posted (5 years 6 months 1 day 16 hours ago) and read 3824 times:

In addition to all of the other airports mentioned, at DCA you can certainly hear the vortices (at Gravelly Point park). It kind of threw me off the first time I heard it, but it's really a pretty cool sensation when you realize what's going on.


"The chief cause of failure and unhappiness is trading what you want most for what you want now." -Zig Ziglar
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