REFLECTOR: VGs
David Ullman
ullman at robustdecisions.com
Thu Jun 7 12:05:08 CDT 2012
I put them on to improve handling qualities. My roll control was very poor
at the beginning and we much to improve it. The change that made the
biggest difference was the addition of the VGs. As I get more comfortable
with the plane I may experiment with taking them off in a sequenced and
careful manner and log the changes in speed and (more subjectively) handling
qualities. For now, they will stay on until I get the rest of the systems
sorted out and me better trained. But, with them on, it does handle very
well and I don't want to degrade that very much.
I am still curious on the effect of the aileron TE on their effectiveness.
I wonder if thickening the TE will have some of the same effect as the VGs.
I knew I didn't paint my plane for a reason.
David Ullman
N444DX
President EAA 292
541-754-3609
david at davidullman.com
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Subject: Reflector Digest, Vol 87, Issue 38
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Today's Topics:
1. Re: VG's (Grover McNair)
2. Re: VG's (nmflyer1 at aol.com)
3. Re: VG's (Glenn Babcock)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 Jun 2012 12:21:34 -0400
From: Grover McNair <grover at mcnairperformance.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: VG's
Message-ID:
<C10EF619-16C6-4828-803D-FBD0397368CD at mcnairperformance.com>
Content-Type: text/plain; charset="us-ascii"
My understanding is that VGs give better control at low speeds with some
small sacrifice of top speed. Having plenty of power would likely compensate
somewhat for the added drag. In thinner air and high density altitude they
should help landing significantly. I have them on my 173lw.
Grover McNair
Sent from my iPhone
On Jun 7, 2012, at 12:01 PM, nmflyer1 at aol.com wrote:
> New thread off of the testing of 44DX.
>
> I am split right down the middle on whether to install VG's on my 173 FGE,
325HP Aluminum V-6.
> Most of my flying is out of High Density Altitude Airports.
> It is 10AM here, and the density altitude is already 7000', my home field
length 4400'
>
> I know VG's would lower critical speeds. What I do not know is if I will
need them with the extra power.
> I could just wait until flight testing to make the decision. See how it
flies without.
> Just thought I would try and get some input from people that routinely fly
out of high density altitude airports.
>
> Thanks,
>
> Kurt
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Message: 2
Date: Thu, 7 Jun 2012 12:30:30 -0400 (EDT)
From: nmflyer1 at aol.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: VG's
Message-ID: <8CF12E1FCE84275-1B58-205B at webmail-d078.sysops.aol.com>
Content-Type: text/plain; charset="utf-8"
Thanks John.
Hope to get this thing painted , assembled and signed off soon. How much
lead time to you need for a Factory checkout?..
Kurt
-----Original Message-----
From: John Abraham <john at velocityaircraft.com>
To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
Sent: Thu, Jun 7, 2012 10:17 am
Subject: Re: REFLECTOR: VG's
Kurt,
The VG?s will lower the stall speed 5-7KIAS if placed in both the main wing
and the canard. Just on the main wing will be a little less. (never place
them on just the canard) Typically if you see them on the main wing only it
is because of the aircraft having a heavier engine in the back and it helps
the main wing lift more to load up the canard better for flight stability.
A 173 however will generally not require them because you are already
generating more lift for the weight of the aircraft compared to the STD or
XL. They serve more as a buffer for landings and will reduce the takeoff
roll slightly. You should be fine without them. You want to find out where
your canard stall speed is at altitude and go from there. That will
determine your approach speed.
John Abraham
Chief Pilot, Executive V.P. Sales and Marketing
200 W. Airport Drive
Sebastian, FL 32958
www.velocityaircraft.com
(P): 772-589-1860
(F): 772-589-1893
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of nmflyer1 at aol.com
Sent: Thursday, June 07, 2012 12:01 PM
To: reflector at tvbf.org
Subject: REFLECTOR: VG's
New thread off of the testing of 44DX.
I am split right down the middle on whether to install VG's on my 173 FGE,
325HP Aluminum V-6.
Most of my flying is out of High Density Altitude Airports.
It is 10AM here, and the density altitude is already 7000', my home field
length 4400'
I know VG's would lower critical speeds. What I do not know is if I will
need them with the extra power.
I could just wait until flight testing to make the decision. See how it
flies without.
Just thought I would try and get some input from people that routinely fly
out of high density altitude airports.
Thanks,
Kurt
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Message: 3
Date: Thu, 7 Jun 2012 11:40:23 -0500
From: Glenn Babcock <glennbabcock at roadrunner.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: VG's
Message-ID: <3AA54D40-E150-4544-9A98-C1E4AD2D7E2C at roadrunner.com>
Content-Type: text/plain; charset="us-ascii"
I held off putting them on my SERG with an MT prop because I had plenty of
takeoff power, but another owner convinced me to try them. I found very
little difference in top speed, and a marked improvement at low speeds. The
elevator and ailerons were much more effective, and the canard stall was at
least 5 knots lower. I highly recommend them.
Regards,
Glenn
On Jun 7, 2012, at 11:21 AM, Grover McNair <grover at mcnairperformance.com>
wrote:
> My understanding is that VGs give better control at low speeds with some
small sacrifice of top speed. Having plenty of power would likely compensate
somewhat for the added drag. In thinner air and high density altitude they
should help landing significantly. I have them on my 173lw.
> Grover McNair
>
>
> Sent from my iPhone
>
> On Jun 7, 2012, at 12:01 PM, nmflyer1 at aol.com wrote:
>
>> New thread off of the testing of 44DX.
>>
>> I am split right down the middle on whether to install VG's on my 173
FGE, 325HP Aluminum V-6.
>> Most of my flying is out of High Density Altitude Airports.
>> It is 10AM here, and the density altitude is already 7000', my home field
length 4400'
>>
>> I know VG's would lower critical speeds. What I do not know is if I will
need them with the extra power.
>> I could just wait until flight testing to make the decision. See how it
flies without.
>> Just thought I would try and get some input from people that routinely
fly out of high density altitude airports.
>>
>> Thanks,
>>
>> Kurt
>> _______________________________________________
>> To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery! www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> _______________________________________________
> To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
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