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  #1  
Old 06-24-2014, 06:04 PM
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comfortcat comfortcat is offline
 
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Default Where does OAT temp probe go?

Wow. a duplicate entry. I need to read more carefully.

Thanks Bruce.

CC
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Last edited by comfortcat : 06-24-2014 at 06:25 PM. Reason: duplicate
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  #2  
Old 06-24-2014, 10:04 PM
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Neal@F14 Neal@F14 is offline
 
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Default

The builder of my RV-6 put the OAT probe in the NACA vent inlet on the right side of the fuselage just behind the engine cowl. Bad location totally. I can start the engine and watch the OAT gauge climb 10+ degrees as the engine warms up even before I let off the brakes to taxi.

One of these days whenever I get a round tuit, I'm going to relocate the probe to the underside of the starboard wing next to the inspection cover.
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  #3  
Old 06-24-2014, 10:10 PM
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Mine is under the horiz stab, right side.
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  #4  
Old 06-24-2014, 11:50 PM
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I placed mine in the wing NACA duct and works perfectly.
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  #5  
Old 06-25-2014, 06:19 AM
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I put them on my RV-10 next to the first access panel under each wing. Yes, I have two. Even though they are about twenty inches away from the fuselage, they seldom agree on the temp. Usually there is a 1-2 degree difference. I'm assuming that is just exhaust heat migrating to one side of the other.\
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  #6  
Old 06-25-2014, 07:43 AM
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mikehoover mikehoover is offline
 
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I had moved my pitot outboard a couple of bays so I used Vans original pitot predrilled hole in my left wing to mount the OAT probe. Seems to be working great.
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  #7  
Old 06-25-2014, 08:23 AM
vic syracuse vic syracuse is offline
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Default TAS calculations

Putting hte temp probes anywhere in the fuselage flow will give higher than normal temps due to the heat coming off of the front of the airplane, not just the exhaust heat.
I get a kick out of the temp probes in the fuselage NACA ducts and the pilots talking about their TAS and how fast they are.
I put mine out on the outboard wing inspection panels. Much different readings, and more accurate TAS readings as confirmed by flying a GPS triangle.

Vic
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  #8  
Old 06-25-2014, 09:46 AM
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Default Probe problem

I tested these probes and they are sensitive to the temperature of the mounting base as well as the probe tip. They basically integrate the average temperature of the whole probe and base. So if you put it in the NACA vent you need to insulate the base inside the aircraft so it is not warmed with cockpit heat. I did this with generous gobs of RTV and it seems to work ok.
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  #9  
Old 06-25-2014, 08:28 PM
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I think real simple - an OAT shoudl be exposed to ambient outside air (uninfluenced by engine heat) and out of the. We've got one in the under-wing NACA scoop (RV-8), one just outboard of the underwing inspection panel (RV-3), and one on the tail inspection plate (RV-6), under the Horizontal tail. All work fine.
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  #10  
Old 06-26-2014, 02:30 PM
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Bill Boyd Bill Boyd is offline
 
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Default OTOH

this goes to show what a terrible location the plans show for a cooling air inlet on the -6. Nothing like sucking air into the cockpit that's a good 10 degrees F warmer than what should be available at altitude for cooling occupants and avionics. If I'd known this 20 years ago, my OAT and NACA vents would BOTH be in a different location!

-Stormy
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