Best bet might be a layer of thin SS; backed
up with a insulating material such as Koolmat, or a couple layers of Al foil on
the cool side. For really close to the hottest part of the exhaust; Koolmat
makes a multifoil inconel mat that should be good to close to 2000F. Of
course it is expensive.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Russell Duffy
Sent: Monday, January 05, 2004
11:17 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] exhaust heat
shield
I'm looking into the best methods
for heat shielding around the exhaust pipes. I'll be squeezing pipes
between the engine mount tube, and cowl, with just less than an inch to clear
on either side. The closest clearance will be about 12"-14"
from the exhaust port, so it will still be pretty hot.
In the previous messages about turbo
heat shielding, I learned that some folks are using aluminum foil, or the
commercial temp shielding on the inside of their cowls with good
results. How close are your pipes to the cowl? Will
simple aluminum foil protect the cowl from the exhaust pipe just an inch
away?
How about the mount tube? I
had the stock turbo shield on the rev-1 setup, and there was about an inch or
so of clearance from the heat shield, to the motor mount tube. I
also wrapped the mount tube with fire sleeve. When I took it all apart,
the fire sleeve appeared undamaged on the outside, but the inside was burnt, as
was the paint on the mount tube. I'm wondering if it wouldn't have been better
without the fire sleeve, so it would have had some airflow. I've
seen the silver heat tape, that can be used to wrap the mount. Will this
type of material be sufficient?
Rusty (Great alcohol report
Jim)