REFLECTOR: VG
Brett Ferrell
reflector at velocityxl.com
Fri Jan 6 19:05:17 CST 2012
I have it and the Kitplanes articles about it in my downloads section (July
and the updates in September/November 1991) in case anybody wants to reread
it.
[LINK: http://www.velocityxl.com/downloads.php?do=cat&id=47]
http://www.velocityxl.com/downloads.php?do=cat&id=47
[LINK: http://www.velocityxl.com/downloads.php?do=cat&id=48]
http://www.velocityxl.com/downloads.php?do=cat&id=48
Brett
-------Original Message-------
From: Lou Stedman
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: VG
Sent: 06 Jan '12 19:23
I forgot about that article. My airplane is in the article. However, it
never made the deep stall. Thank God.
FROM: [LINK: mailto:scott at tnstaafl.net] Scott Derrick
SENT: Friday, January 06, 2012 4:56 PM
TO: [LINK: mailto:reflector at tvbf.org] Velocity Aircraft Owners and Builders
list
SUBJECT: Re: REFLECTOR: VG
I read the July 1991 Sport Aviation article again about deep stalls and
at the end of the article it states
WING DESIGN CHANGE
Immediately following the deep stall
incident mentioned early in this report,
Dan Maher redesigned the Velocity
wing by extending the trailing edge and
changing the aft inboard camber
slightly, and he reports that recent tests
of the new wing installed on the prototype trailer-mounted airplane show
that there is no unrecoverable deep stall
with this new configuration. The outboard wing LE cuffs will therefore
not
be required for kits now being shipped.
CONCLUSIONS
1. The Velocity kits preceding the
above change will receive leading edge
cuffs as tested on the fourth flight.
2. It is believed that the pitchups on
the fourth flight were caused by the
strake lift existing after main inboard
wing stall, which overpowered the pitchdown moment from the still-flying
outboard wings; the pitchdown to controlled flight occurred when the
strakes
stalled.
3. Further trailer testing should be
done to develop an understanding of
the reason for the low descent rate
existing in the deep stall condition. It is
possible that a very large, strong vortex
was formed above the wing which could
not be detected by surface tufting. It is
my understanding that Mr. Witold
Kasper has demonstrated this phenomenon in flight.
- James M. Patton, Jr.
Test Pilot
With no mention of the Vortilons, I must be wrong about there need for
safety of flight. Sorry for crying wolf!
Scott
-------- Original Message --------
Subject: Re: REFLECTOR: VG
From: Scott Derrick [LINK: mailto:scott at tnstaafl.net]
mailto:scott at tnstaafl.net
To: Velocity Aircraft Owners and Builders list [LINK:
mailto:reflector at tvbf.org] mailto:reflector at tvbf.org
Date: 01/06/2012 11:46 AM
I'm not sure why Duane said that.
During the main wing stall investigation when Maher still owned
Velocity, he said that Vortilons significantly reduced the chance of
encountering deep stall and recommended them on all airplanes in
addition to the changes they made to the strake and reduced rear CG
range.
Maybe The Swings changed something later that reduced that requirement?
Maybe only STD size wings need them?
I had not heard they were no longer required and apologize if I was
spreading miss-information. They are supposed make the ailerons more
effective at low speeds, I don't know because I have never flown without
them.
I have flown with and without VG's and they definitely increase aileron
effectiveness and reduce takeoff and landing speeds.
Scott
-------- Original Message --------
Subject: Re: REFLECTOR: VG
From: [LINK: mailto:velocityoner at yahoo.com] velocityoner at yahoo.com
To: Velocity Aircraft Owners and Builders list [LINK:
mailto:reflector at tvbf.org] mailto:reflector at tvbf.org
Date: 01/06/2012 11:13 AM
The factory doesn't have vortilons on their aircraft. My airplane has
been flying for 19 years without them. Not to say that I wouldn't put them
on but I know of other velocities without them as well. I have the short
wing. I once asked Duane about adding them and he said they went needed.
I have somewhere around 800 landings to date. I may try them one day
along with TE Fences. It would be interesting to see how much difference
they make.
Victor Taylor
N93DV
Sent from my iPhone
On Jan 6, 2012, at 10:54 AM, Scott Derrick <[LINK:
mailto:scott at tnstaafl.net] scott at tnstaafl.net> wrote:
I think your confused. What was mounted on your Glastar where
Vortilons, not VG's. We have Vortilons on the V's and only people with
a death wish fly without them. VG's on the other hand are optional, but
I think they are worth every penny and hassle.
Scott
-------- Original Message --------
Subject: Re: REFLECTOR: VG
From: Peter Braswell [LINK: mailto:peter.braswell at gmail.com] <[LINK:
mailto:peter.braswell at gmail.com] peter.braswell at gmail.com>
To: Velocity Aircraft Owners and Builders list [LINK:
mailto:reflector at tvbf.org] <[LINK: mailto:reflector at tvbf.org]
reflector at tvbf.org>
Date: 01/06/2012 08:58 AM
All,
The VG's seem to be a bit of a pain to deal with. I was wondering about
the tangible benefit they provide and are they worth the heart burn?
I had VG's on my Glastar. They were however just triangular shaped
devices that were mounted just above the airfoil out on the leading edge
and they roughly followed the curvature of the wing. There were two on
each wing, one mounted about 3/4 outboard and the other right at the
root. They were advertised to lower the stall speed and to help
maintain aileron effectiveness at low airspeeds. I ended up removing
the root mounted VG's to better seal the wing root area (the cabin was
drafty) and I didn't notice one bit of difference in either handling or
the stall speed.
Peter
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------------------------------------------------------------------------
On Fri, Jan 6, 2012 at 9:52 AM, Scott Derrick <[LINK:
mailto:scott at tnstaafl.net] scott at tnstaafl.net> wrote:
I have CC I vg's on my plane. They are OK. They are sharp and care
must be used when washing the plane. They also get brittle over time,
they are not UV proof as advertised.
Barry Gibbons &[LINK: mailto:lt%3Bgibbons at as.net] lt;[LINK:
mailto:gibbons at as.net] gibbons at as.net> wrote:
I was looking at Velocity‘s store web site and they didn’t have the VG
for the wings and canard. I found a place called CCI of New Jersey has
any body used their VGs?
Barry
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