flyrotary@lancaironline.net Mailing List Archive

John, any slightly separated shield will help. If you must use the mat type use one with a reflective foil on the inside and the matting against the cowl. Soemtimes that is the best you can do. Try to circulate some air in there if possible.
Bill

-----Original Message-----
From: John Downing <downing.j@sbcglobal.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 27 Sep 2007 5:37 pm
Subject: [FlyRotary] Re: cowling protection

Bill, I have 2 tight 90 degree turns that I cut out of a SS donut. For the short term, like until next January, I could use some temporary protection. I looked at the Power Sport installation two years back and they used a complete shield on the exhaust pipe and it will take a lot of time to fabricate. Was hoping to fly soon and finish the detail things next winter when the snow gets deep. JohnD

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

From: WRJJRS@aol.com

To: Rotary motors in aircraft

Sent: Thursday, September 27, 2007 12:29 AM

Subject: [FlyRotary] Re: cowling protection

In a message dated 9/26/2007 6:05:38 PM Pacific Standard Time, downing.j@sbcglobal.net writes:

What is the rule of thumb for the heat shield between the exhaust pipe and the cowling. I have fiberfrax to glue on and planned on covering it with .016 SS, the pipe is 2 1/2 SS, do I need a shield 5 inches wide? Thankyou JohnD

John, insulation is a good idea but the best way to prevent radiated heat is to use a heat sheld. The more space you can give it (on BOTH sides) the better. Feeding a small air bleed in the area to cary off the heat is also a good idea. The air bleed doesn't have to be big, it just has to keep the air moving.

Bill Jepson

See what's new at AOL.com and Make AOL Your Homepage.

Email and AIM finally together. You've gotta check out free AOL Mail!