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My exhaust is coated in and out with a 2000 degree coating. Its holding up OK, but I wouldnt rely on it to keep the heat off of nearby components. I have a stainless heatshield around a large portion of the exhaust and I have a self adhesive fiberglass heat shielding material applied in various places like the inside of the cowl. In places not protected by the heatshield, the adhesive has gotten hot enough to release. I also have a couple of painted parts fairly close to the exhaust that have gotten hot enough for the paint to burn.
Mike Wills
RV-4 N144MW
----- Original Message ----- From: "Ben Schneider" <plumberben@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, July 27, 2009 4:54 AM
Subject: [FlyRotary] Intake filter box & Jet Hot Exhaust Coating
Thanks for the kind words. Let me answer some of the questions. The intake filter box has a K&N filter inside, and a butterfly valve for ram air that bypasses through the center of the filter. It also has a spring loaded door that would suck open in the event of the opening being plugged. That is why the odd shaped top.
The pictures of the exhaust are pretty old. In the one picture, the exhaust had not yet been sent to the coater. I guess I should also add that the coating is not actually Jet Hot coating as I have been calling it, (common trade name) It was actually done by High Performance Coatings (www.hpcoatings.com) It is their equivalent to the Jet Hot. Supposed to be good up to 2000 degrees, and supposedly reduces surface temperatures as much as 65%. I am wondering if that is true or just sales propaganda? Guess I'll find out.
The muffler is an Aeroturbine muffler, all stainless, 2 1/2" inlet and outlet. Don't have any idea if it will blow apart, quite the thing, or just increase drag. Yet another unknown. Ahh, the life of an experimenter....
;)
Will be off line for a few days, headed to OSH. Hope to see some of you there.
Ben
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