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From: "Ed Klepeis" <techwelding@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2016989@logan.com>
Subject: Re: [FlyRotary] Re: oil coolers
Date: Mon, 30 Apr 2007 00:10:42 -0500
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Dear Al
      The new core mat. that I use for my coolers is just like oem mazda 
high pressure and same overall size. I can make them wider if need be. My 
question is there that much of an advantage in the  oil/water  over the 
oil/air cooler being that there is more lines to hook up with the oil/water 
system.
thanks for suggestions.
                                                                             
                   Regards
                                                                             
               Ed Klepeis
----- Original Message ----- 
From: "Al Gietzen" <ALVentures@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, April 30, 2007 12:28 AM
Subject: [FlyRotary] Re: oil coolers


      What is your opinion on oil coolers air/oil or water/oil. I know art
is running a water cooler oil cooler and it works fine my concerns are if
you should lose water cooling there goes the whole system water and oil. At
least if you have your oil cooling system air cooled you have some cooling
of the eng to get you safely on the ground. Also less lines to hook up
without the water going to the oil cooler.I have a meeting with my neighbor
Waltrip the nascar fellows cheif mech to talk this subject over will be
interesting to see what the nasca boys say and use. I can build it either
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


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