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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 |
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. |
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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Larry |
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.
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What Vince said. At least a foot away from the fuse.
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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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Under the wing, just outboard of the aileron bellcrank inspection cover.
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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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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. |
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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. |
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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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 |
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