I put my OAT probe on the rear H stab spar, under the emp cover. It gets a good dose of ambient air in flight (negative pressure under the emp cover) and am confident that it is getting a good sampling of ambient air without a drag penalty. I recently came to realize that the G3X modifies the OAT probe reading to account for heat induced from air stream friction. My location is not in the free stream, so it is likely reading a few degrees cooler than actual. Someone posted some data that implied that this friction accounts for about 2-3 degrees at cruise speeds.
I do not want to re-wire the probe, so my only alternatives are to leave it where it is at or put it on the side of the fuselage under the H stab. My 6 has it located there, but I always wondered if I was getting some exhaust heat affect in that location. I fly IFR, so am more comfortable with a slightly low reading over one that is slightly high. I suppose that I could splice in another 6 feet of wire and put the probe under the H stab out near the tip, but am not sure that I would be able to mount the probe there.
Has anyone put there probe in this location with good results? I suspect most of us really don't know how accurately our probe is measuring that actual temps.
Appreciate any guidance here.
Larry
I do not want to re-wire the probe, so my only alternatives are to leave it where it is at or put it on the side of the fuselage under the H stab. My 6 has it located there, but I always wondered if I was getting some exhaust heat affect in that location. I fly IFR, so am more comfortable with a slightly low reading over one that is slightly high. I suppose that I could splice in another 6 feet of wire and put the probe under the H stab out near the tip, but am not sure that I would be able to mount the probe there.
Has anyone put there probe in this location with good results? I suspect most of us really don't know how accurately our probe is measuring that actual temps.
Appreciate any guidance here.
Larry
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