Speaking of exhaust radiation, has anyone tried
painting there exhaust manifold black with a high temperature paint (stove
blacking). This would greatly increase the metals ability to radiate energy. This should keep the metal much cooler allowing
for use thinner and lower temperature steels. The down side is that there would
be more heat radiated in side the cowl. However, I think this would be a small
price to pay for dropping the manifold temp a few hundred degrees. I all crunch
the numbers on this when I get the time.
Alex Madsen
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bulent Aliev
Sent: Sunday, May 23, 2004 7:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Two
problems solved, 2 more pop up...
On 5/23/04 7:54 PM, "Ed Anderson"
<eanderson@carolina.rr.com> wrote:
----- Original Message -----
From: Bulent Aliev <mailto:atlasyts@bellsouth.net>
To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
Sent: Sunday, May 23, 2004 2:41 PM
Subject: [FlyRotary] Re: Two
problems solved, 2 more pop up...
On 5/23/04 11:49 AM, "Alex Madsen"
<madsena@rose-hulman.edu> wrote:
I would try aluminum tape
for radiation shedding of the turbo after shutdown. Just apply it to the
cowl wherever you want some shielding. It is sold in almost any
hardware, and is designed for high temps.
Aluminum tape alone will not do it. You should get Fiberfax from Spruce
and glue the FF to the cowling than the Aluminum (or better stainless) to
the Fiberfax. The Stainless will reflect the heat and the FF will
insulate the skin from the heat.
Bulent
While Fiberfax sounds like an ideal material
for such a problem, let me caution you about it. I also attempted
to use Fiberfax to insulate my lower cowl from the header pipes. I
soon removed it because it was fragile and tore easily, but more
importantly it absorbed oil like a sponge. I could just see it
sitting there oil soaked waiting for the right combustion event.
I removed it and found that aluminum foil worked
just fine and was much cheaper and less fire prone. As long as you
are not applying the aluminum foil to the headers or turbo pipes them
selves, it will work nicely. Now, if you are going to wrap it
around a turbo or header then I agree it will not stand up to the
temp/heat.
But, unless you are going to forever have an oil
free engine compartment I caution against fiberfax unless you somehow
incase it so oil drippings will not be absorbed by it.
FWIW
Ed Anderson
Having self adhesive aluminum foil
close to the red hot turbo it will melt the adhesive. Also if you are getting
oil in this area, you are in trouble already. I agree fiberfax is brittle, but
they also have other insulators that will work.
Bulent