Message-Id: <200405241422.i4OEMboa028382@mxsf24.cluster1.charter.net>
From: <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Cowling heat sheilding...........
Date: Mon, 24 May 2004 14:22:37 +0000
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> 
> From: "Marvin Kaye" <marv@lancaironline.net>
> Date: 2004/05/24 Mon AM 03:40:09 GMT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Two problems solved, 2 more pop up...
> 
> Protecting the interior of the cowling from radiated heat is a big deal, 
> especially if you have a turbo under there acting like a big piece of 
> charcoal.  We used a product called Zetex 800 Aluminized to provide protection 
> on the lower cowl of the Eagle540 installation.  (Lots of other Lancair guys 
> have used this material as well for the same reasons with both the Lycoming 
> TSIO540 and Continental TSIO550 installations.)  It's a pretty expensive 
> alternative, one that required us to put together a group buy, of sorts... one 
> guy worked as the coordinator to purchase the 50 yard roll (minimum), everyone 
> bought their 1 or 2 yard orders from him.  Take a look at the Newtex website 
> (http://www.newtex.com/home.htm), they're the company that manufactures the 
> product.  It's basically a glass fiber cloth with an aluminized surface bonded 
> to one side.  We applied it with red (hi-temp) RTV silicone sealant to 
> anyplace that was subject to directly radiated heat (ie, sides of the cowling 
> facing the turbos, undersides of intercooler ducts that face the exhaust 
> manifolds).  I thought I had some photos that showed the installation, but 
> apparently I do not.  I'll try to take a couple tomorrow and send them along.

This is what I have done on aircraft installations that have an inch or so room inside the cowl. Buy some spacers for rivets or screws, get the thin ss sheet and bolt it inside the cowl using the spacers so that an airspace is created between the ss sheet and the glass cowl. Best protection there is is an air space.
Marc Wiese