Mailing List flyrotary@lancaironline.net Message #11317
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: high oil pressure and coolers
Date: Sun, 12 Sep 2004 11:19:26 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message

The important point is that Rusty likes to do it the hard
way :)
I think that he firmly believes that "experimental" needs to be followed
to the letter. Why benefit from other's results when you can do the
experiment yourself :)

Now wait just a minute :-) 
 
While some of the above is clearly true, I had very good reason to try the evap core, and it was based on Tracy's results.  He recently mentioned that he never goes over 210 degrees for oil, but he didn't mention that his SOP is to reduce power almost immediately after takeoff.  If I'm not mistaken, he did this with his B drive also, to keep from overheating.  He also climbs at 130 mph or so.  With my evap core, I could climb forever at 90 mph without exceeding 200 degrees when I had the B drive.  It's only now that I'm making more power that it becomes a limitation.   Tracy's an efficiency freak <G>, so he's willing to give up some extended climb performance to reduce cooling drag in cruise.  My philosophy is that I want to be able to use all the power, all the time, without overheating. 
 
So if you want better oil cooler performance, what do you use.  Let's see, what is Tracy putting on his 3 rotor RV-8 project.  Last I heard, it was an evap core :-) 
 
I didn't get my test fitting in time to check the pressure at the engine outlet, so that test will wait until later this week, assuming Ivan makes that a moot point.   In thinking about oil cooling options, I'd still like to have a water to oil cooler, but I'd have to make the 3rd evap core water also, and also add the new heat exchanger.   Unfortunately, that would add too much weight. 
 
As for Ivan, it seems John's anti-hurricane mojo is more powerful than mine at the moment.  I seem to be getting closer and closer to the center of prediction with every report.  It's almost certain that it will hit here, and destroy my hanger, since I now have the new Slingshot in there also.  Of course they both have liability coverage.  It's still way too early to worry about that. 
 
Rusty (working on my mojo)
 
 


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