REFLECTOR: Cooling
Velocity Aircraft Owners and Builders list
reflector at tvbf.org
Tue Jun 24 10:47:45 CDT 2014
/With this success in mind, it was decided to try the VG’s on the armpit
scoops of our XLRG demo airplane (see photo below). In this
installation, we plumb the air from the armpit scoops up to the plenum
chamber and then down through the cylinders. Placing two VG’s about 4”
in front of the armpit scoop entrance has resulted in a 40 degree
reduction in cylinder temperature. I would have never guessed we could
achieve this much reduction but the numbers don’t lie. If you’re having
a difficult time getting your cylinder temperatures down, this might be
your answer. Keep in mind that if your using the updraft type cooling
through the arm pit scoops you need to add about 40 degrees to what your
indicating. This is due to the fact your CHT probes are installed on the
bottom of the cylinders and the fresh air coming from the scoops are
cooling the probes. If you want to try it on your airplane, let us know
and we will send you 4 VG’s and you pay only a shipping and handling
charge. In our installation the leading edge of the VG fins are 1.5
inches apart and the trailing edges of the fins are 2.25 inches apart.
This results in a total difference of .75 inches and will provide the
proper “kick out.” If you are trying this on a standard fuselage NACA
installation, you will need to move them closer together. The important
measurement is the .75 inch that provides the proper angle. (see picture
# 3)/
/Also, keep in mind that the attach surface of the VG should be sanded
prior to the silicone installation. The VG’s are made of a plastic
material and if used where the sun will get to them, they should be
sanded and painted to reflect the UV’s./
VV armpit1.jpg
<http://wiki.velocityoba.com/index.php?title=File:VV_armpit1.jpg>
On 6/24/2014 10:23 AM, Velocity Aircraft Owners and Builders list wrote:
> Anyone have experience with VGs on a 173RG with the older armpit
> scoops? If so please send a pic and explanation.
> Appreciate it, Jeff
> Thank you, Jeff
> TEAM JEFF Real Estate
>
> Jeff Findarle - *Realtor*, GRI
> PRES.-Wasatch Co Association of Realtors
> Darin Heckel - Realtor
> AllStar Realty
> 575 N main St.
> Heber City, UT. 84032
>
> Jeff's Cell 435-503-0514
> Darin's Cell 435-671-3957
> Off. 435-654-9440
> Fax 435-654-9437
> Distressed Property Experts, Short Sales a Specialty!
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>
>
> On Tuesday, June 17, 2014 10:41 PM, Velocity Aircraft Owners and
> Builders list <reflector at tvbf.org> wrote:
>
>
>
> That is the way I had them before ...... Thanks ....... I guess I
> will
> install them the same way again.
>
> Ron
> On 6/17/2014 7:26 PM, Velocity Aircraft Owners and Builders list
> wrote:
> > If you can imagine which way the vortex is spinning, I believe you
> > want to place it such that the vortex is captured by the side of
> the
> > NACA.
> >
> > I.e., looking at it from the front, the VG to the left of the NACA
> > centerline needs to angle to the left.
> > http://wiki.velocityoba.com/images/9/90/VV_naca2.jpg
> >
> > On 06/16/2014 11:53 AM, Velocity Aircraft Owners and Builders
> list wrote:
> >> Like you just got my plane painted. I had VG 8" in front of the
> nacas
> >> when in primer and had no cooling
> >> issues. Now that I have paint on it and have not reinstalled
> the VG's
> >> yet the temps are a little higher about
> >> 20 Degs. I will be installing the VGs back on to see if it
> returns to
> >> my normal temps. MY question
> >> is similar which is better for installation of VG's with them
> >> pointing into the wind > or pointing the direction of the wind
> >> < . Does it make a difference ?
> >>
> >> Ron
> >> On 6/16/2014 11:03 AM, Velocity Aircraft Owners and Builders
> list wrote:
> >>> Painted 444DX. I will post pictures when I get some good ones
> and
> >>> also send
> >>> them to VOBA. But smooth paint has changed the airflow around
> the
> >>> fuselage
> >>> and I now have cooling issues. I have the NACA scoops on the top
> >>> and an IO
> >>> 360 in an SEFG. Before I painted it, the surface was rough
> primer.
> >>> I had
> >>> mild cooling issues before and put some 1.5" scoops at the
> rear of NACA
> >>> ducts and they seemed to have helped a little, but they were ugly
> >>> (to me).
> >>> So, with no duct extensions I am overheating on climb out and
> even
> >>> cruise
> >>> with the cg forward.
> >>>
> >>> Two questions: 1) I want to try vortex generators. I already
> have
> >>> them on
> >>> the wing and canard, so why not. I thumbed through the Reflector
> >>> for the
> >>> last two years and could not find where to place them. Any
> ideas?
> >>> Also, is
> >>> there an easy way to search Reflector other than month to
> month as I
> >>> have
> >>> been doing?
> >>>
> >>> 2) In talking to Alan Shaw (yes I did find him, thanks to
> those who
> >>> helped
> >>> on that) and he suggested adding tabs near the root of the
> prop (3
> >>> blades,
> >>> fixed pitch, Catto) to draw more air through. Anyone tried
> that or
> >>> have and
> >>> suggestions on size, angle, etc.)
> >>>
> >>> I have now flown over 25 Young Eagles. They always clamor for
> rides
> >>> my Velo
> >>> over the RVs. Cant imagine why.
> >>>
> >>> PS. I suspect many of you are interested in antique cars. So
> you may
> >>> want to
> >>> follow my progress in the Great Race as I navigate a 1932
> Buick from
> >>> Maine
> >>> to Florida, June 21 -29. This will be my 5th participation in
> rally.
> >>> Follow my progress on http://www.greatrace.com/ as I get lost in
> >>> Vermont or
> >>> Georgia. The results will be posted daily. I will be in car
> #61.
> >>> If you
> >>> look on the site you will see what cities we stop in. Note that
> >>> lunch stops
> >>> are very brief, little time to be social, but evening stops are a
> >>> concurs
> >>> event with much social time. If I am going to be in a city near
> >>> you, love
> >>> to meet you and show you the cars (there will be about 100
> dating from
> >>> 1910).
> >>>
> >>>
> >>> David Ullman
> >>> N444DX
> >>> President EAA 292
> >>> 541-760-2338
> >>> david at davidullman.com <mailto:david at davidullman.com>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
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> >>
> >> _______________________________________________
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> >
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>
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>
>
>
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