REFLECTOR:Vortex Generators on XL

Sun, 07 Dec 2003 00:03:35 -0600

--------------FB45EB09DB1F9968A8B16575
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Keith,
Parallel VGs on the main wing makes a lot of sense.  I would
intuit that a little angle (in a direction that would deflect
airflow toward the root) would be nice since it would generate
*something* at cruise and keep the flow attached (haven't
thought it through enough to explain why this might be important
:o).  Closer spacing of the main wing VGs might also help.  I'll
run it by Jim P.  I'm also toying with the idea of bracketing
the ailerons with fences ala' Vari-EZ.  Might help with low
speed roll authority, and gawd knows we need all the help we can
get in that department.
Something to ponder ... Jim S.

KeithHallsten wrote:

> Scott,...snip ... he recommended that the "crowfoot" pattern
> of VG placement be used on the canard, since it has no sweep,
> and a little slip couldn't  dramatically change the effect of
> the VGs if each pair worked either way.  However, he suggested
> placing the VG's on each swept main wing all parallel to each
> other in such a way as to "trip" the spanwise flow at low
> airspeeds and high angles of attack, while being nearly
> parallel to the flow at high airspeeds.  ... snip ... Keith
> Hallsten

--------------FB45EB09DB1F9968A8B16575
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<body bgcolor="#FFFFFF">
Keith,
 Parallel VGs on the main wing makes a lot of sense.&nbsp; I would intuit
that a little angle (in a direction that would deflect airflow toward
the root) would be nice since it would generate *something* at cruise and
keep the flow attached (haven't thought it through enough to explain why
this might be important :o).&nbsp; Closer spacing of the main wing VGs
might also help.&nbsp; I'll run it by Jim P.&nbsp; I'm also toying with
the idea of bracketing the ailerons with fences ala' Vari-EZ.&nbsp; Might
help with low speed roll authority, and gawd knows we need all the help
we can get in that department.
 Something to ponder ... Jim S.
KeithHallsten wrote:
<blockquote TYPE=CITE><style></style>
Scott,...snip
.... he recommended that the "crowfoot" pattern of VG placement be used
on the canard, since it has no sweep, and a little slip couldn't&nbsp;
dramatically change the effect of the VGs if each pair worked either way.&nbsp;
However, he suggested placing the VG's on each swept main wing all parallel
to each other in such a way as to "trip" the spanwise flow at low airspeeds
and high angles of attack, while being nearly parallel to the flow at high
airspeeds.&nbsp; ... snip ...&nbsp;Keith
Hallsten</blockquote>

</body>
</html>

--------------FB45EB09DB1F9968A8B16575--