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From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: oil coolers
Date: Sun, 29 Apr 2007 21:28:48 -0800
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      What is your opinion on oil coolers air/oil or water/oil. I know =
art=20
is running a water cooler oil cooler and it works fine my concerns are =
if=20
you should lose water cooling there goes the whole system water and oil. =
At=20
least if you have your oil cooling system air cooled you have some =
cooling=20
of the eng to get you safely on the ground. Also less lines to hook up=20
without the water going to the oil cooler.I have a meeting with my =
neighbor=20
Waltrip the nascar fellows cheif mech to talk this subject over will be=20
interesting to see what the nasca boys say and use. I can build it =
either=20
air/oil or water/oil. What are the opinions out there.thank

     Regards

             Ed Klepeis

Ed;

Depending on the installation, there can be some good reasons, and
advantages, to oil-water heat exchangers.  I had taken a serious look at
that.  What I found was that the available oil-water coolers were =
designed
based on typical piston engines where the oil flow rates are much lower =
than
in a rotary.  I think Fluidyne has some of the best ones, but coolers =
sized
for the heat load had oil side pressure drop that was prohibitive for =
full
flow on the rotary.  So if you are designing an oil-water exchanger, =
keep
that in mind.

Al