Mailing List Message #58911
From: Chris Barber <>
Subject: Re: [FlyRotary] Ceramic coated rotors
Date: Tue, 28 Aug 2012 14:55:30 +0000
To: Ernest Christley <>
Cc: Rotary motors in aircraft <>
I guess it has been discussed (I may have missed it if I was focusing at my current task at hand), but what is the point of the ceramic on the rotors?  I don't know of this to be a problem area or even a wear point. Ceramic apex seals I understand but just don't understand a compelling advantage to cost, potential pita factor.


Sent from my iPhone 4

On Aug 28, 2012, at 8:57 AM, "Ernest Christley" <> wrote:

> I'm having to break the engine down to fix an oil leak between the bottom of the engine and the mounting plate.  I took
> the opportunity to check on the ceramic coating I applied to the rotors before assembly.  There was some questions a
> while back about how resilient the coating would be on the rotors.  I've had this engine up to 5600 RPM, running mostly
> rich, down to 11:1, at high power, but as high as 19:1 on the lower end.
> If you make the youtube video I posted the link to fullscreen, you can see that the coating is still intact for the most
> part.  The  exception being a vertical band down the centerline of the rotor, starting in the compression recess and
> extending out.  This looks like it may have burn/blown off the coating in the areas of high temp/velocity gasses...but
> I'm just guessing.  If you advance the video VERY slowly, there are a couple frames just before the rotor comes into
> view where you can see the sides of the recess, and the coating is still there.  Here is a pic of the rotors before they
> went into the engine.
> <EngineCeramicCoatingRotorThermalBarrier2.jpg>
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