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06-24-2014, 08:44 AM
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Join Date: May 2006
Posts: 532
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OAT Probe Location Recommendation?
Hi,
I'm looking for recomendations for locating an OAT probe in my (flying) -4. I recently installed a D10A and would like to incorporate OAT capability. I'd like to find an accurate, minimally invasive, unobtrusive, and easy-to-wire location for the probe. (How hard can that be?) Thanks in advance for the help.
Dean
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06-24-2014, 08:56 AM
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Join Date: Jan 2007
Location: Mount Vernon, IN
Posts: 1,270
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Put it out in the wing somewhere. The air around the fuselage is always hotter than ambient, unless you're flying a Long-Eze. There was an 11 degree difference on my RV-4 and on my Rocket. This was measured in the fuselage NACA vents and wing roots, -vs- out in the wing near the bellcrank access access holes.
This is also a good reason to add underwing fresh air vents during construction.
Dean, if putting it out in the wing seems like too much trouble, just remember that bad data is worse than no data. Hopefully, your RV-4 has a wing conduit installed already!
YMMV.
__________________
Vince Frazier
www.f1aircraft.com
F1 Rocket and F4 Raider components
1-888-F1AIRCRAFT (1-888-312-4727)
www.flyboyaccessories.com
RV and Rocket Accessories, Tailwheels, Tools, & More
1-888-8FLYBOY (1-888-835-9269)
F4 Raider - under construction
F1-H Rocket "Crazy Horse" - sold
RV-4 "Chief Pontiac" - sold in 1994, purchased in 2018
Last edited by vfrazier : 06-24-2014 at 08:59 AM.
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06-24-2014, 08:57 AM
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Join Date: Oct 2012
Location: Friendswood, TX
Posts: 74
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I placed my Dynon OAT on the right side of the fuselage in the shade under the right elevator.
Seems to work well for me--on an RV-7A.
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06-24-2014, 09:47 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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Quote:
Originally Posted by Rodney
I placed my Dynon OAT on the right side of the fuselage in the shade under the right elevator.
Seems to work well for me--on an RV-7A.
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I put mine here as well, but have not been in the air yet. My OAT is wired to the Dynon Magnetometer harness, so was placed here in part for convenience. Read many posts with folks using this location successfully.
Larry
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06-24-2014, 10:14 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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I have mine on the inspection panel just under the LE of the left HS. I did it on the inspection panel so that I could move it if it's seeing too much air from the cowl. So far, seems to be pretty accurate.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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06-24-2014, 10:29 AM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,400
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What Vince said. At least a foot away from the fuse.
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Kahuna
6A, S8 ,
Gold Hill, NC25
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06-24-2014, 10:43 AM
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Join Date: Jul 2008
Location: Santa Rosa, CA
Posts: 580
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quick and easy
On both my RV's I placed the probe behind the flap and tie wrapped it to the the lightening holes on the flap brace W421. Out of the sun and away from the fuselage and out of sight.
Steve
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06-24-2014, 10:49 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Here you go:

(Click to enlarge)
__________________
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, 12:15 PM
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Join Date: Jul 2005
Posts: 1,347
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Under the wing, just outboard of the aileron bellcrank inspection cover.
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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06-24-2014, 12:41 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Quote:
Originally Posted by N941WR
Here you go:

(Click to enlarge)
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I like that solution. 
__________________
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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