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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