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06-24-2014, 02:49 PM
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Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,563
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Quote:
Originally Posted by rightrudder
I like that solution. 
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The problem with that location is that it really isn't OUTSIDE. Once enclosed by the intersection fairing it will be INSIDE the tail cone. Perhaps it might be close to the actual outside air temperature but it will most likely receive some heat from being enclosed INSIDE the airplane. Putting it out near one of the wing access plates will get the probe OUTSIDE in the OUTSIDE AIR, it will be easily accessible from the access plate and it can be relatively easy to run wiring from that location into the fuselage and to the instrument.
These pics are not very good of my installation but you can see at the yellow circle where the OAT probe is installed just inboard of the first access plate in the left wing:

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06-24-2014, 03:12 PM
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Join Date: May 2012
Location: Harrisburg, Pa
Posts: 759
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Quote:
Originally Posted by RVbySDI
These pics are not very good of my installation but you can see at the yellow circle where the OAT probe is installed just inboard of the first access plate in the left wing
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Same location here - works great. Moved from NACA vent, which was not very good at all.
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06-24-2014, 05:17 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Quote:
Originally Posted by RVbySDI
The problem with that location is that it really isn't OUTSIDE. Once enclosed by the intersection fairing it will be INSIDE the tail cone. Perhaps it might be close to the actual outside air temperature but it will most likely receive some heat from being enclosed INSIDE the airplane.
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Yeah, I understand that?it partly depends on how "drafty" your empennage fairing is.
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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06-24-2014, 06:05 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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I know you want experience here, but I researched this and will be mounting my OAT in the wing root, L/S. After phase I, I might just mount some thermocouples and see how different positions compare, but that is later.
Good luck with your location.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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06-24-2014, 07:11 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by rightrudder
Quote:
Originally Posted by RVbySDI
The problem with that location is that it really isn't OUTSIDE...
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Yeah, I understand that…it partly depends on how "drafty" your empennage fairing is.
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It is plenty drafty in that location and you don't have to worry about knocking if off when washing the plane.
When I first taxi out, it will read high, no surprise there, but by the time I'm climbing out, it matches the other planes I have flown with, within a degree or two, even on very cold days when I have the cabin heat on.
Also, my empennage fairing is very tight. There is just that much air going through our cockpits that it doesn't really matter.
Probably the worst place for the OAT probe is in the NACA vent.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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06-24-2014, 08:30 PM
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Join Date: Jul 2008
Location: San Antonio, TX
Posts: 54
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we put our outside air temp on the inspection plate in the tail of the plane. It's out of the sun and far enough away from the engine to be accurate
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06-25-2014, 01:54 AM
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Join Date: Sep 2010
Location: Northern California
Posts: 78
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Does anyone have any guidance as to accuracy of an OAT probe mounted inside the wing near the aileron bell crank vs mounted on the bottom of the wing in the slipstream?
Thanks,
Jeff
__________________
RV-7
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06-25-2014, 09:29 AM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Quote:
Originally Posted by N941WR
It is plenty drafty in that location and you don't have to worry about knocking if off when washing the plane.
When I first taxi out, it will read high, no surprise there, but by the time I'm climbing out, it matches the other planes I have flown with, within a degree or two, even on very cold days when I have the cabin heat on.
Also, my empennage fairing is very tight. There is just that much air going through our cockpits that it doesn't really matter.
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Yes, a nice protected spot, straightforward wiring and no extra drag for the knots-obsessed. Me gusto mucho.
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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