VG'S {Bob @ Dave}
Posted: Fri Feb 17, 2012 4:52 pm
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for <murphy-rebel@dcsol.com>; Wed, 25 Nov 1998 00:29:48 -0500 (EST)
From: REBEL112R@aol.com
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Date: Wed, 25 Nov 1998 00:29:48 EST
To: murphy-rebel@dcsol.com
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Subject: VG'S {Bob @ Dave}
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The following info comes from a person whose expertise in aerodynamics is
the
following. If you stick your head out the car window, the faster you go,
the
harder it is to breathe. Does the Rebel need VG's, probably not. In
landing
my Rebel I found that at the speeds I was using the aircraft,developed a
quick
sink in the flair,which required a quick response with elevator. I could
land
faster and not have that problem but the field I am using is rough enough
that
I wanted to be going as slow as I could before allowing it to set down. I
had
read the Sport aviation articles on the Glastar and those little Delta wings
that they used drew my interest. At Oshkosh 2 years ago I got to talking to
a
fellow whose company did custom work and construction of the Glastar for
customers . They also made a nice looking set of carbon fiber Delta
wings[big
vg's] for the Glastar. He said he would make a set to fit the airfoil of
the
Rebel for a 100 bucks, so I said OK. He made me a set and I stuck them on
and
away I went. I used photos of the Glastar for an idea on spanwise
placement.
The fellow said that I should place them for and aft so that the leading
edge
was about even with the tip of the VG. Did they help? I think they helped
a
little, with no adverse effect. I do get a lot of questions. Thats not
all!
This summer I was dropping my daughter off at her cousins in Anacortes WA.
As
I was tying down the Rebel I was approached by a Charles White whose company
Micro AeroDynamics is based on the airport at Anacortes. He has a kit out
for
the Rebel [300 buck]. He did not have anything bad to say about the d-wings
I
had installed, but said I should try his VG's. There went 300 more bucks.
I
left the D-wings on and spaced the regular vg's as per his instructions.
Where the d-wings sit I just ommitted a pair of the vg's. Also there are 10
vg's on the underside of each horiz. stab. just forward of the hinge line.
32
on each wing, placed in pairs starting inboard of the fiberglass wingtip
about
3 1/2 inches. Each pair is placed at an angle of 70 degrees from the first
stringer line of rivets on the top side of the wing. Each pair is angled
v-
like and spaced about 1 1/2 inches apart. The spacing between pairs is
about
9 inches. Any conflicts with rivet lines, you just move that pair slightly.
Also they are centered between the first and second stringers. So now you
want to know if all these gizmos attached to my wings help. Yes I think
they
do. I have tried to measure a change in stall speed, difficult in a Rebel
because it just mushes. I can accelerate the stall by jerking in the
elevator
close to the stall but then have a hard time telling how fast I was going.
I
know that my landings at slow approach speeds, no longer have that quick
sink
and I feel a lot better making 50mph approaches. What are the vg's supposed
to do? ANSWER Keep the air attached at high angles of attack. Bob, the
rivets
don't help here,sorry. I like them,they do not seem to have any effect on
cruise speed. Drawbacks, sure . If I lived in Alaska they might be a pain
in
the @@@ trying to get frost off on a winter day. You have to be a little
more
careful with the fuel hose. But when you are at an airshow nobody notices
the
runs in the paint but are asking what those little gizmos.are on the wing
are
for. The vg's are about 1 1/4" long and about 1/2" high. Micro has a
website
www.microaero.com/micro if anyone wants further info. I am done, Good night
all.
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by imo27.mx.aol.com (IMOv16.10) id ECYDa02196
for <murphy-rebel@dcsol.com>; Wed, 25 Nov 1998 00:29:48 -0500 (EST)
From: REBEL112R@aol.com
Message-ID: <a61db2c0.365b95cc@aol.com>
Date: Wed, 25 Nov 1998 00:29:48 EST
To: murphy-rebel@dcsol.com
Mime-Version: 1.0
Subject: VG'S {Bob @ Dave}
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7bit
X-Mailer: AOL 4.0 for Windows 95 sub 214
The following info comes from a person whose expertise in aerodynamics is
the
following. If you stick your head out the car window, the faster you go,
the
harder it is to breathe. Does the Rebel need VG's, probably not. In
landing
my Rebel I found that at the speeds I was using the aircraft,developed a
quick
sink in the flair,which required a quick response with elevator. I could
land
faster and not have that problem but the field I am using is rough enough
that
I wanted to be going as slow as I could before allowing it to set down. I
had
read the Sport aviation articles on the Glastar and those little Delta wings
that they used drew my interest. At Oshkosh 2 years ago I got to talking to
a
fellow whose company did custom work and construction of the Glastar for
customers . They also made a nice looking set of carbon fiber Delta
wings[big
vg's] for the Glastar. He said he would make a set to fit the airfoil of
the
Rebel for a 100 bucks, so I said OK. He made me a set and I stuck them on
and
away I went. I used photos of the Glastar for an idea on spanwise
placement.
The fellow said that I should place them for and aft so that the leading
edge
was about even with the tip of the VG. Did they help? I think they helped
a
little, with no adverse effect. I do get a lot of questions. Thats not
all!
This summer I was dropping my daughter off at her cousins in Anacortes WA.
As
I was tying down the Rebel I was approached by a Charles White whose company
Micro AeroDynamics is based on the airport at Anacortes. He has a kit out
for
the Rebel [300 buck]. He did not have anything bad to say about the d-wings
I
had installed, but said I should try his VG's. There went 300 more bucks.
I
left the D-wings on and spaced the regular vg's as per his instructions.
Where the d-wings sit I just ommitted a pair of the vg's. Also there are 10
vg's on the underside of each horiz. stab. just forward of the hinge line.
32
on each wing, placed in pairs starting inboard of the fiberglass wingtip
about
3 1/2 inches. Each pair is placed at an angle of 70 degrees from the first
stringer line of rivets on the top side of the wing. Each pair is angled
v-
like and spaced about 1 1/2 inches apart. The spacing between pairs is
about
9 inches. Any conflicts with rivet lines, you just move that pair slightly.
Also they are centered between the first and second stringers. So now you
want to know if all these gizmos attached to my wings help. Yes I think
they
do. I have tried to measure a change in stall speed, difficult in a Rebel
because it just mushes. I can accelerate the stall by jerking in the
elevator
close to the stall but then have a hard time telling how fast I was going.
I
know that my landings at slow approach speeds, no longer have that quick
sink
and I feel a lot better making 50mph approaches. What are the vg's supposed
to do? ANSWER Keep the air attached at high angles of attack. Bob, the
rivets
don't help here,sorry. I like them,they do not seem to have any effect on
cruise speed. Drawbacks, sure . If I lived in Alaska they might be a pain
in
the @@@ trying to get frost off on a winter day. You have to be a little
more
careful with the fuel hose. But when you are at an airshow nobody notices
the
runs in the paint but are asking what those little gizmos.are on the wing
are
for. The vg's are about 1 1/4" long and about 1/2" high. Micro has a
website
www.microaero.com/micro if anyone wants further info. I am done, Good night
all.
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