Bob,
If you wrap it, then how will you inspect it for cracks?

Mark S.

On Nov 10, 2007 8:56 AM,  <bmears9413@aol.com> wrote:
> I planned on wrapping the entire exhaust system to keep the heat put of the
> engine compartment. You think thats a bad plan?
>
>  Bob Mears
>  Supermarine Spitfire
>
>
>  -----Original Message-----
>  From: Lehanover@aol.com
>  To: Rotary motors in aircraft <flyrotary@lancaironline.net>
>  Sent: Fri, 9 Nov 2007 8:18 pm
>  Subject: [FlyRotary] Re: Burns Stainless Drag Muffler
>
>
>
>
> In a message dated 11/9/2007 6:24:41 P.M. Eastern Standard Time,
> bmears9413@aol.com writes:
> I was told that inconel is what was used in jet engines to take the heat. It
> was the only thing that would take the heat and not crack. I hope thats
> correct, cause I reached real deep in my pockets to insure I was doing the
> right thing for my application. Gonna be a real pisser if it cracks!
> Expecially if I go down in flames!
>
>  Bob Mears
>  Supermarine Spitfire
>
>
> Those hot section vanes have N-2 compressor air pumping through them to
> extend their life spans. They do crack, and in some cases the crack can be
> ignored if there is only one. Or, a single vane or some number of vanes can
> be replaced Or a nick can be filed down and polished. Total hours between
> hot section checks and the number of starts must be recorded. But crack they
> do.................
>
> A little cooling air on the exhaust system is a good idea. On the dyno those
> things glow a bright orange and heat up anything in a line of sight.
> Shielding is a must. A thick walled stainless tube covered in heat wrap gets
> the job done and the lack of under-hood heat is amazing.
>
> Lynn E. Hanover
>
>
>
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