Viscount724
Topic Author
Posts: 18971
Joined: Thu Oct 12, 2006 7:32 pm

Vortex Generators

Fri Dec 24, 2010 10:54 pm

Just curious why some 737NGs have a row of 10 vortex generators on the nose just behind the radome, and others do not?

For example, these aircraft (737-700 and 737-800) have the vortex generators:


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Photo © Mark McEwan
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Photo © Ruud Brinks



And these (both 737-700) do not appear to have them.


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Photo © Juan Carlos Guerra - FlyAPM
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Photo © Andrés Contador - AirTeamImages



Re the Aeromexico 737-700 above, there are photos of other AM 737-700s that do have those vortex generators. One below. Why the difference?


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Photo © Matthew C. Lyons



Another general question: Why are these types of vortex generators much more common on Boeing than on Airbus aircraft? It seems that almost all Boeings (except possibly the 747; I'm not sure about the 787) have many of these protruberances.

I was on a KLM 737-400 a couple of weeks ago, seated just in front of the wing, and counted 26 vortex generators on each wing and another 4 or 5 on the inner side of the engine cowl. There are also 4 on each side of the rear fuselage between the vertical and horizontal stabilizers, for a total of about 70.
 
737tdi
Posts: 1116
Joined: Sun Sep 02, 2007 10:05 am

RE: Vortex Generators

Fri Dec 24, 2010 11:15 pm

The vortex generators just below the windshield are there to reduce noise. The vortex generators on the wings are a totally different beast. They are there to direct airflow, either away/or towards a flight control, or to maintain the boudary flow/direction on the wing. On the wing it's all about lift and if a little generator helps? it's applied. You will probably get many more answers but this is the basic.
 
bohica
Posts: 2303
Joined: Tue Feb 10, 2004 3:21 pm

RE: Vortex Generators

Sat Dec 25, 2010 2:36 am

I just noticed something in the pictures that got my attention. The planes without the vortex generators came with eyebrow windows. In the picture of the GOL plane, they have been plugged up. The ones with the vortex generators have no sign of ever having eyebrows. When Boeing started building the 737NG without the eyebrow windows, did they start adding the nose vortex generators at the same time?
 
zanl188
Posts: 3442
Joined: Sat Oct 21, 2006 9:05 pm

RE: Vortex Generators

Sat Dec 25, 2010 1:15 pm

Quoting bohica (Reply 2):
When Boeing started building the 737NG without the eyebrow windows, did they start adding the nose vortex generators at the same time?

Yes, part of the same improvement package as I recall

A thread from 2005, same subject...
RE: Any Feedback On 737 Windshield Vortex Generators? (by OPNLguy Mar 19 2005 in Tech Ops)

[Edited 2010-12-25 05:27:04]
Legal considerations provided by: Dewey, Cheatum, and Howe
 
User avatar
HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Vortex Generators

Sun Dec 26, 2010 6:12 am

Quoting bohica (Reply 2):
When Boeing started building the 737NG without the eyebrow windows, did they start adding the nose vortex generators at the same time?

I believe Both mods were issued together.
regds
MEL.
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