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From: "Russell Duffy" <13brv3@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Cooling?
Date: Sun, 3 Aug 2003 11:35:50 -0500
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My opinion (not data) is that if your cooling problem only occured on =
the
ground and not airborne then cooling fans MIGHT have merit.  However, at
flying airspeeds they might hinder airflow through the radiators more =
than
help, just hard to tell.

=3D=3D=3D>  Hopefully, I'll have some info on this soon.  I have a 16" =
fan on my
radiator.  I figure that I'll get some good use out of it on the ground, =
but
I'm not sure what good it will be in the air, particularly since I have =
such
a large intake scoop. It's located on the outside of the radiator, so it
also serves the purpose of keeping the radiator from getting hit by fod =
that
might be picked up by the prop. =20

=3D=3D=3D>  The only time I can see the fan being useful in flight, =
would be if
you had your ducts sized so small that they worked for cruise, but not =
climb
speed.  There would also be some initial climb use value if you can use =
the
fans to keep the temp on the low end prior to departure.  In my Lyc =
powered
RV-8, I did everything I could to keep my pre-departure cylinder temps =
as
low as I could.  This really made the difference between red-lining the
temps, or not during climbout on a hot day.=20

Rusty (W&B today, it's going to be a pig)   =20