speedracer1407
Posts: 330
Joined: Fri Dec 24, 2004 4:19 pm

Funny Sound Under Approach Path: Wake Turbulence?

Sun Sep 27, 2009 8:54 am

A few weeks ago, I flew into PDX and rented a car at National's remote lot. I forgot to set up my GPS untill after I left the lot, and later found the perfect place to pull over and set it up: under the approach path to one of the runways.

I've never done any plane spotting, and so never been able to observe planes this close to the ground on their final approach. I've read, however, that wake turbulence can make funny noises under the approach path.

I watched a 767 fly overhead as I was trying to program the GPS. About a minute or two later, I was startled by a sound that seemed to be coming from everywhere.

It was as if someone was plucking a giant wood saw, or maybe long suspension bridge cables breaking. Come to think of it, it was exactly like the sound effects in Dr. No when Sean Connery is crawling through water pipes after escaping from his prison cell in Dr. No's lair.

A lot of setup for a simple question: is this what wake turbulence sounds like when it descends to the ground under an approach path?
Dassault Mercure: the plane that has Boeing and Airbus shaking in their boots.
 
User avatar
Aaron747
Posts: 8524
Joined: Thu Aug 07, 2003 2:07 am

RE: Funny Sound Under Approach Path: Wake Turbulence?

Sun Sep 27, 2009 11:16 am

Yep you got it - you heard the glorious sound of vortices ripping through otherwise calm air  Wink
If you need someone to blame / throw a rock in the air / you'll hit someone guilty
 
User avatar
Moose135
Posts: 2555
Joined: Mon Oct 04, 2004 11:27 pm

RE: Funny Sound Under Approach Path: Wake Turbulence?

Sun Sep 27, 2009 12:39 pm

That's what you heard - it's especially pronounced when a 757 lands, you hear a "crackling" sound after it goes by, I just love hearing it!
KC-135 - Passing gas and taking names!
 
flashmeister
Posts: 2671
Joined: Fri Apr 28, 2000 4:32 am

RE: Funny Sound Under Approach Path: Wake Turbulence?

Tue Oct 06, 2009 4:50 am



Quoting Speedracer1407 (Thread starter):
A few weeks ago, I flew into PDX and rented a car at National's remote lot. I forgot to set up my GPS untill after I left the lot, and later found the perfect place to pull over and set it up: under the approach path to one of the runways.

I know just the spot that you stopped... on Cascades Pkwy (I believe) near the Embassy Suites. I heard the wake whipping noise every time I used to spot out there. It's a pretty nice spot -- would be be even better if they'd get rid of the trees between that spot and the end of the runway...
 
musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

RE: Funny Sound Under Approach Path: Wake Turbulence?

Wed Oct 07, 2009 10:38 am

Next time, try looking for them also. On a clear day with no condensation, if you're roughly in line with the runway, look at the delineation between sky and tree-line (i.e. the local horizon), over the runway edge (you know where they're going to be).

The low density air in the vortex shows up as refraction. Its possibly even more cool than hearing them!

Let us know how you get on!

Regards - musang
 
noelg
Posts: 2313
Joined: Fri Apr 26, 2002 11:39 pm

RE: Funny Sound Under Approach Path: Wake Turbulence?

Wed Oct 07, 2009 9:39 pm

You get this regularly at LHR at Myrtle Avenue (just shy of 27L threshold). A 767 or 777 makes an incredible noise, a really surreal effect that comes on so quickly, lasts a few seconds that seem like a lifetime, before the ripping noise just disappears!

It really is like nothing else in this world, almost like you're in your own little world for a few seconds, very strange but an awesome noise!

Who is online

Users browsing this forum: No registered users and 13 guests