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I put my OAT probe in the NACA inlet on the left side of the lower cowling
that feeds air to the oil cooler. It has worked there perfectly for the life
of my plane. Two problems, if you can consider them problems, are noted.

First, after shut-down, hot air flowing back out of the duct gives incorrect
OAT readings, which goes away once you are moving. Second, you must
disconnect the probe (I use the connector that came with my system) whenever
the lower cowl is removed. this doesn't seem too much of a burden as it's
right next to the cooling duct which also must be disconnected when the
lower cowl comes off.

The first "problem" doesn't bother me much as I soon get a correct OAT
reading as soon as I start moving and it's always right on when I'm
airborne. Granted, there are times when it'd be nice to know the OAT on the
ground - for instance to figure the density altitude and if I have flown in
the last hour or so, the heat in the duct prevents that. However, I just
couldn't see sticking that probe out into the airstream when everything else
is so nicely tucked away - like all the antennas - so I live with it.

Dan Schaefer
N234SP

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