OAT gauge sensor

[Nigel Charles <72016.3721@compuserve.com>]

Message text written by "David.Corbett"
>Does anyone have a view about the most appropriate location for an OAT
gauge sensor?
There is a need to avoid - engine bay heat; exhaust heat; and wind chill.<

I placed mine in the port side NACA fresh air duct inlet just poking down
through the upper triangular wedge face (my ducts are fixed open and flow
controlled by a car vent outlet). This position was chosen as it is shaded
---From the sun and doesn't receive any significant ram air heating. It seems
to work OK with no change whether the vent is open or closed. The position
is also quite convenient for connecting to the panel. Anyone buying either
the uMonitor or uEncoder is supplied with this sensor so an extra gauge on
the panel is not necessary.  I have both and use the uEncoder display for
OAT and the uMonitor display for fuel temperature. It is quite interesting
to watch the fuel temperature climb after shutdown. In UK summer conditions
I regularly see fuel temps in the high thirties degC five minutes after
shutdown. I find that the engine compartment cools a little quicker if the
inspection doors are left open during a short turnround (just be sure to
check they are closed before the next departure). 

Nigel Charles