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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Sun Oct 22, 2006 6:56 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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Stop the presses...I just found a product that might do the job for my
pot scrubber needs...aluminum "Lint Snares"(patented name), a product
that "slips easily onto end of laundry hose". I was looking for more SS
scrubbing pads when I saw these. They are much small than the SS
pads...about 2" in diameter, and about an inch thick. They unroll to
form a sock that you attach to the end of the laundry hose where it
dumps into the sink, preventing lint from going into the sink. They
look like a prophylactic when unrolled, but I wouldn't try using it for
that function...kinda scratchy, I'd think. : )
But in their unrolled form, they look like little doughnuts that can be
stuffed in my small heat muffs, and they should perform pretty well in
the radiation/convection/heat transfer job that they will (maybe) be
asked to do.
Lynn
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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occom
Joined: 26 Aug 2006
Posts: 404
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| Posted: Sun Oct 22, 2006 7:41 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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I'm not clear on whether this is a good idea, aluminum will burn under some
circumstances and in the presence of heat and moisture it will oxidize even
if it doesn't burn when you are dealing with very thin stuff. You might be
better off with the stainless. I doubt that heat transfer is a big part of
the function anyway. I figure what you are after is turbulence and latency
in the air's transit through your system. You could do as well with a series
of disks clamped to the pipe if I'm visualising what you want properly.
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dave
Joined: 22 Sep 2006
Posts: 1382
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Sun Oct 22, 2006 11:30 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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Not a rotax, thank you VERY much, and not a muffler.
Let me set the facts straight...I have a heat muff (similar to the ones
on p. 298 of the new Spruce catalog)...which in my case is clamped
around the EXHAUST pipe inside of which I record temperatures of 1400+
degrees Fahrenheit. Inside the muff is where I am using the
alum/stainless/copper pot scrubbers to transfer the heat from the
exhaust pipe to the air which is routed through the heat muff via scat
hose to the cabin of the plane. Due to the very short length of this
heat muff (about 6"), I need to get the air warm in a hurry. There is
no room to install a longer heat muff on the short Jabiru exhaust
pipes. I'm thinking that if the temp inside the pipes is 1400F, the
temp outside the pipe and inside the muff is nowhere near the 1200
needed to melt aluminum, even in the small size of the "wire" used in
aluminum pot scrubbers. I've got scat hose clamped onto the heat muff,
and it shows no signs of sticking to the heat muff when removing it for
service, so melting the alum is probably not an issue.
Lynn
Kitfox IV Speedster...Jabiru 2200
do not archive
On Sunday, October 22, 2006, at 01:48 PM, Dave wrote:
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You will not burn aluminum on a rotax Muffler. Alum melts around
1200 and muffler I doubt is hotter than 300 F or so.
1200f temps will found in the y pipe manifold only and the temp
decreases as you travel done the cone to the Muffler.
Now lets get some videos done guys and then we can have a contest
like who has the best smoke system on their Kitfox 
Dave
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Jim Shumaker
Joined: 09 Jan 2006
Posts: 106
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| Posted: Sun Oct 22, 2006 5:53 pm Post subject: Aluminum "pot scrubbers"...was heat muffs |
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I have an EGT located (mis-located) in my muffler outlet on a 912. I regularly see 1500 degrees at this point so the pipes could easily still be quite hot at this point.
Jim Shumaker
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lcfitt(at)sbcglobal.net
Guest
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| Posted: Sun Oct 22, 2006 8:49 pm Post subject: Aluminum "pot scrubbers"...was heat muffs |
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Wow, I love this. It is great reading. Right on Lynn. Skystar has
supplied aluminum heat muffs since day one of the 912 series. The Lancair
IV I work on has aluminum heat muffs. Hey, guys they work. The surface of
the exhaust pipe exceeds 300° or they wouldn't change color as they do, but
the aluminum survives. Guys have been using the brass and SS scrubbers with
success.
In my mind no amount of argument will change any of these facts.
Respectfully,
Lowell
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occom
Joined: 26 Aug 2006
Posts: 404
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| Posted: Mon Oct 23, 2006 1:58 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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| Quote: |
Wow, I love this. It is great reading. Right on Lynn. Skystar has
supplied aluminum heat muffs since day one of the 912 series. The Lancair
IV I work on has aluminum heat muffs. Hey, guys they work. The surface
of the exhaust pipe exceeds 300° or they wouldn't change color as they do,
but the aluminum survives. Guys have been using the brass and SS
scrubbers with success.
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I should never have used the word burn although I have seen aliminum wool
burst into flame. I was actually thinking that it was likely the thin
aluminum could turn to powder (oxide) in such an environment. I had visions
of it becoming airborn with the rush of air and getting all over and into
everything. Probably never happen.
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dave
Joined: 22 Sep 2006
Posts: 1382
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| Posted: Mon Oct 23, 2006 2:01 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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I should have added on rotax 582 2 strokes. The 4 strokes no matter the brand run a higher pipe temp just outside the exhaust.
That being said, exhaust heat sheild on the muffler will never see 1200 F or will it ? The muffler would have a reddish glow if so.
Dave
[quote] ---
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Realtime Kitfox movies to separate the internet chatter from the truth
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Mon Oct 23, 2006 5:01 am Post subject: Aluminum "pot scrubbers"...was heat muffs |
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Wow, that seems very hot for the outlet of a muffler. I would think
that the 1400F or so degrees of exhaust gas temperature would have
cooled some by the time the gasses had made their way into the muffler,
circulated some and then exited the muffler. But you are seeing 1500F
at the muffler outlet? Is it a reliable sensor/gauge?
What temp does the 912 recommend for EGT?
Lynn
On Sunday, October 22, 2006, at 09:53 PM, James Shumaker wrote:
[quote] I have an EGT located (mis-located) in my muffler outlet on a 912. I
regularly see 1500 degrees at this point so the pipes could easily
still be quite hot at this point.
Jim Shumaker
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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