then your air velocity through your cooler will be
> approx 0.1 - 0.3
> of your airspeed.  So for a 200 MPH speed you might have 20 -60 mph air
> velocity through your cooler fins not 200.  Just though I would
> mention it.

Hi Ed;
Do you really think that it will be this fast? Even say through the Evap
cores? The reason I ask is that I've just installed a fan on the back side
of one of my evap cores to be used in conjunction with one of my EWP's to
reject cowl/engine heat after shutdown. I assumed/guessed that the airflow
exiting through the evap core will be slowed down to <5mph. I don't have any
data to support this, it just seemed reasonable.
I didn't add a shroud around the fan as I didn't want to hurt in-flight
cooling by forcing all of the air through the fan blades, even though this
will make the fan less efficient. But I think if it does see up to 60 mph
airflow then it's lifespan will indeed be short.

S. Todd Bartrim   (completing panel modification/upgrade)
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

   "Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".