OAT Probe

jwilbur · #1 04-13-2016, 10:13 AM

Anyone install their OAT probe through the bottom of the RV10 fuse in the battery compartment bay or the bay just aft? Any reason not to?

rleffler · #2 04-13-2016, 10:21 AM

Quote:

Originally Posted by jwilbur

Anyone install their OAT probe through the bottom of the RV10 fuse in the battery compartment bay or the bay just aft? Any reason not to?

You want to keep it out of the exhaust flow. Based on how much grime I clean off that location, I'm not sure I would put it there.

I have one adjacent to the first access panel on each wing. At that distance, I'm seeing a 1 degree difference in temps. I don't know if that reflects a real difference or just a calibration issue.

Bluelabel · #3 04-13-2016, 10:26 AM

I didn't get mine until it was shipped with my panel from Stien,then it was too late to put it into the wing. Put it as far back as I could.
People will say that the exhaust will effect it. I really don't think so. Exhaust is going to get blown away well before it hits the probe. So far high speed taxiing around shows it gives the same reading as my GRT probe which which is in my front Naca scoop. But that also gives me point of reference as well.
Made the install a lot easier that's for sure.

guccidude1 · #4 04-13-2016, 10:29 AM

Agree with previous post not to put on bottom of fuselage. Exhaust and hot air from engine will cause a warmer than normal outside air temp. This elevated temp will affect TAS readings and thus affect wind direction and speed display. Recommend placement on wing access panel. Dan from Reno

Bill.Peyton · #5 04-13-2016, 10:32 AM

I put mine in the right wing in the panel near the bellcrank. It's right on the money

Auburntsts · #6 04-13-2016, 10:33 AM

Quote:

Originally Posted by Bluelabel

I didn't get mine until it was shipped with my panel from Stien,then it was too late to put it into the wing.

Why was it too late?

Flying again! · #7 04-13-2016, 11:23 AM

Quote:

Originally Posted by Bluelabel

I didn't get mine until it was shipped with my panel from Stien,then it was too late to put it into the wing. Put it as far back as I could.
People will say that the exhaust will effect it. I really don't think so. Exhaust is going to get blown away well before it hits the probe. So far high speed taxiing around shows it gives the same reading as my GRT probe which which is in my front Naca scoop. But that also gives me point of reference as well.
Made the install a lot easier that's for sure.

I moved mine from the NACA duct and moved it under the right wing near the first access panel. The new location shows 3-5 degree F lower temperature than the NACA duct. I think the NACA duct gets air that is heated by the engine/cowl and spillage from the inlets as well as the sun.

Just my observation.

TJ

Bluelabel · #8 04-13-2016, 12:13 PM

Quote:

Originally Posted by Auburntsts

Why was it too late?

It was already wired into our harness. Which meant fishing the actual probe itself out to the wing.
Once flying next month I'll do some testing and post if there's any discrepancies... I suspect that at the speeds the 10 goes, there won't be any issues, but I'll find out.

For what it's worth, I see ALOT of OAT probes installed in the NACA scoop.
Most certified planes they are on the windscreen about 6 inches for where mine is in the scoop.

jwilbur · #9 04-13-2016, 12:15 PM

Many RV10s have NACA scoops in the back also (such as mine). Any thoughts about putting the probe in the rear scoops?

Ironflight · #10 04-13-2016, 12:24 PM

Quote:

Originally Posted by Bluelabel

It was already wired into our harness. Which meant fishing the actual probe itself out to the wing.
Once flying next month I'll do some testing and post if there's any discrepancies... I suspect that at the speeds the 10 goes, there won't be any issues, but I'll find out.

For what it's worth, I see ALOT of OAT probes installed in the NACA scoop.
Most certified planes they are on the windscreen about 6 inches for where mine is in the scoop.

For what it's worth, there have been many, many reports here on VAF and other RV places that the NACA scoop will read high by a significant amount in flight.

Taxi testing isn't going to show this - nowhere near the amount of power or airflow. You might see a lot of OAT probes in NACA scoops on RV's, but that doesn't mean they are reading correctly. Those of us that have actually TESTED to location know that it doesn't work if you want accuracy.