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Date: Tue, 18 Dec 2007 17:10:11 -0500
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Subject: RE: [LML] Re: VG's for cooling - missing post?
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Thread-Topic: [LML] Re: VG's for cooling - missing post?
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From: "Lancair" <lancair-esp@ustek.com>

John,

A vortex generator is an aerodynamic surface, consisting of a small vane
that creates a vortex. They can be found in many devices, but the term
is most often used in aircraft design. They are often used in pairs,
angled toward each other at the leading edge and forming a "V".=20

Vortex generators are added to the leading edge of a swept wing in order
to maintain steady airflow over the control surfaces at the rear of the
wing. They are typically rectangular or triangular, tall enough to
protrude above the boundary layer, and run in spanwise lines near the
thickest part of the wing. They can be seen on the wings and vertical
tails of many airliners. Vortex generators are positioned in such a way
that they have an angle of attack with respect to the local airflow.

A vortex generator creates a tip vortex which draws energetic,
rapidly-moving air from outside the slow-moving boundary layer into
contact with the aircraft skin. The boundary layer normally thickens as
it moves along the aircraft surface, reducing the effectiveness of
trailing-edge control surfaces; vortex generators can be used to remedy
this problem, among others, by re-energizing the boundary layer. Vortex
generators delay flow separation and aerodynamic stalling; they improve
the effectiveness of control surfaces (e.g Embraer 170 and Symphony
SA-160); and, for swept-wing transonic designs, they alleviate potential
shock-stall problems (e.g. Harrier, Blackburn Buccaneer, Gloster
Javelin).

Many aircraft carry vane vortex generators from time of manufacture, but
there are also after-market suppliers who sell VG kits to improve the
STOL performance of some light aircraft.


Robert M. Simon
(Wikipedia info)

-----Original Message-----
From: John Schroeder [mailto:jschroeder@perigee.net]=20
Sent: Monday, December 17, 2007 7:28 PM
To: lml@lancaironline.net
Subject: Re: [LML] Re: VG's for cooling - missing post?

I must have missed  it, but does anyone have a definition of  "VG" plus
pictures and mounting instructions for their installation. Many thanks,

John Schroeder
LNCE - 180 hours.


On Mon, 17 Dec 2007 07:25:14 -0500, Douglas Brunner
<douglasbrunner@earthlink.net> wrote:

> No that was from me, but I think Robert Simon has ordered them and may
have them installed.
>
> I put some on temporarily but don't have any good data yet about what
effect they have.
>
> D. Brunner
> douglasbrunner@earthlink.net
>
>   ----- Original Message -----
>   From: Colyn Case on earthlink
>   To: lml@lancaironline.net
>   Sent: Sunday, December 16, 2007 4:19 PM
>   Subject: [LML] VG's for cooling - missing post?
>
>
>   I can't find the original post about VG's for cooling.   Was that
from Robert Simon?
>