Alu foil will work to handle radiant heat.
It will *not* handle exhaust gasses from cracks or pin-holes in the echaust headers or pipes. I had cracks in my original in-cowling muffler *evaporate* an .016 alu heat shield.

If you're handy with fiberglass you'll probably not mind patching holes in the hopefully rare case of a crack or pinhole, and the alu foil will be just fine. But definitely use SS to shield critical components like carbs, fuel and oil lines.

Finn

Ed Anderson wrote:

I found that taking RTV and thinning it a bit with MEK I can "paint" it on the fiberglass of the cowl and then lay thick aluminum foil over it.   It sticks very well and the aluminum is more than enough to handle any radiant heat.  Now if your header is only an inch from your fiberglass then stainless foil would probably be a better bet.

 

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Monday, February 23, 2004 9:46 AM

Subject: [FlyRotary] Re: exhaust

I use Stainless Steel Shim Stock from MSC. They come in a tube 6" wide by 50" in all kinds
 if thicknesses.
 

 

McMaster Carr also sells stainless "foil".  I just bought some 321 ss foil that's .002", and plan to use that to cover some parts of the cowl.   

 

Rusty