Mailing List flyrotary@lancaironline.net Message #21299
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: Renesis Build Options
Date: Mon, 2 May 2005 20:36:24 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Bill, not quite certain how it do that.  I can understand that the rotor being coated would tend to lessen the amount of heat the rotor would absorb and therefore keep the temp of the oil ,which cools the rotor, down.  But, it then seems that heat has to go/do something.  I agree there should be some increase in overall efficiency by keeping the temperature of the combustion chamber elevated.  However, I believe that heat has to go somewhere and I think you would see a rise in coolant temps.   
 
Interesting thought.  Two things have happened with the recent engine, one of which I've only mentioned to Tracy.  First, the low oil temp, but that's only partially due to the ceramic coating.  The other is a rise in EGT's.  I've had a problem keeping EGT's below  1750 in climb since the rebuild.  It never dawned on me that some of this might be due to heat that didn't go into the oil.  Hmmmmm
 
As for the balancing, I already chimed in on that over the backwards plastic plane site.  I've heard tale that the Renesis rotors aren't nearly as consistent as the 13B rotors were in weight.  I know that Bruce was not really suggesting balancing in the past, but maybe the Renesis can make better use of a balancing job.  Mind you this is pure speculation.   For $350, and no inconvenience, there's no doubt I'd get any engine balanced.  
 
Cheers,
Rusty
  
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