Mike Wills wrote:

  If your talking about an electric fan, yes I think you are missing
something. I have heard of cases where the fan bearings failed while
freewheeling in a duct at cruise speeds. Also the fan freewheeling in the
duct reduces the airflow in the duct which could lead to overheating and it
contributes significant drag.
  I plan to install a couple of windshield washer reservoirs and rig spray
bars in front of my rad and oil cooler cores prior to first flight. They
can be turned on as needed to spray cool water on the cores. I hope this
will provide enough reserve cooling capacity for ground cooling and in case
of overheating problems during the test program. Hopefully they wont be
needed and can later be removed but they are cheap and easy insurance for
the taxi testing and first flights.

Mike Wills

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