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Date: Thu, 23 Jul 2009 21:40:02 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Intake velocity stack length
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Ben Schneider wrote:
> Dennis.
>
>   I was looking forward to seeing your improvements at Oshkosh this year, sorry to hear you won't be there. I am thinking I may make an intake very similar to Tracy's just carbon fiber instead of aluminum. I need to do a little more research before I jump into this. Would you happen to have ever taken an under cowl temp measurement in the vicinity of the intake? I need to figure out what kind of sustained temp it needs to endure. I have my exhaust Jet Hot coated inside and out (supposed to reduce surface temps as much as 65%) though I think some of this is just advertising propaganda. We'll see. I also intend to put a reflective shield between the intake and exhaust. So I am really just trying to figure out the air temp there.
>
> Thanks.
>
> Ben

I don't know exactly how to quantify this, but the -Eze builders were 
making cooling baffles (screwed directly to the heads of Lyc/Conts) out 
of fiberglass over 20 years ago, when exotic high temp epoxies weren't 
available to homebuilders. I guess you have to decide whether the 
abundance of cooling air or direct contact with a 350+degree cylinder 
head is more significant in affecting the -glass.

Charlie