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Date: Mon, 02 May 2005 16:07:49 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Renesis Build Options
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Ed Anderson wrote:

>
>     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.  But, that's just
>     speculation on my part.  Not saying there aren't some advantages
>     to having them coated - but if like most things there are probably
>     some disadvantages as well.
>      
>     Ed A
>
Ed, wouldn't the heat go out with the exhaust?

Didn't Al run some numbers the last time ceramic coating went around the 
list?  I remember him predicting a 15 degree delta, but I can't recall 
what the delta applied to.

Al, when you ran those numbers, were you able to take into account that 
the smoother surface would possibly help create a laminar boundary layer 
at the rotor face.

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