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Hi, Frederick!
'Sorry I referred to you as Frank in
the previous two postings! I have one OAT mounted behind the rear wing spar
ahead of my flap for my Rocky Mountain u-monitor, and one in the tailcone above
and behind the elevator spar cutout for my Dynon EFIS. Both of them agree within
1 degree C of each other in flight, and they also agree with the forecast
temperature. One way to determine if you are getting stagnation rise, which I
have done, is to fly slowly, say 100 mph, and record the OAT, then get up
to cruise speed and see what the OAT says. I've done some data processing with
downloads from some of the raceplanes and am astounded by how badly their
avionics/OAT locations gives density altitude variations with airspeed changes,
even though baro altitude stays the same. Klaus has his OAT flush on the skin of
his EZ. In a side-by-side comparison, as we got up to speed, his corrected OAT
and dalt showed a drop, since his instrument used the 80% stagnation rise
estimate and his wasn't that great. My OAT never
changed.
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