Jeff
If there was not sufficient air flow,
then the air outlet temp would be very high, not very low – unless the
temp number is not correct, or there was a great deal of by-pass flow.
Re: Here is my fan installation.
It is a 4-blade, pull, high flow, Spall. The inlet scoop is sealed to the
other side of the rad. I don’t know whether it spins in flight when
turned off, but there is no evidence that it does. It works fine after 160
hours in flight. If it is a concern, one could always use a relay that shorts
the leads when turned off serve as electromagnetic brake. A spinning fan
would be more restrictive to flow being forced through it than one that is
stationary – contrary to one’s intuition.
Al