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t.j.vanduin(at)gmail.com
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 Posted: Wed Sep 01, 2010 2:27 pm Post subject: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabi |
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Hugh,
Tiny grass particles were found earlier at the backside of my instrument panel also
and on the cabin floor. Not that much because we mainly used paved runways.
How to solve this problem is a challenge to me too.
Theo van Duin (France)
Allegro 2000
Rotax 912UL
71MM
2010/8/31, Hugh McKay <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)>: [quote] If you have an Allegro 2000 you know that the air intake for warm cabin air is under the bottom cowl. This is about a 2 1/2" round opening connected to a flexible duct that is connected to a s.s. shroud around the muffler where it picks up heat from the outside of the muffler and transports it to the cabin. The cool air intake is a similar flexible duct that brings in fresh air from a different location bypassing the muffler.
I keep my plane at an air field with turf runways. On numerous occasions in the summer during takeoff I have smelled what seemed like burnt grass, but it went away after leaving the ground. I believe that pieces of cut grass clippings are being kicked up by the prop blast and blown into the intake opening under the bottom cowl and thus back into the muffler shroud and burned. I this is indeed what is happening, how can this be prevented? Also recently when I had my Instrument panel pulled back for some electrical maintenance, the backside of the panel, as well as the instruments and the wiring was covered with grass clippings! This really surprised me. What a pain it was to clean all the dirt, dust and grass clippings out. Has anyone else who keeps their plane at a turf field had this experience?
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Wed Sep 01, 2010 4:01 pm Post subject: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabi |
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Theo,
I believe the two-way diversion valve in the round duct does not close tightly enough allowing a small amount of grass clippings to pass each time one takes of and lands on a grass field. I think I am just going to close off the intake opening to the muffler during the Summer months since fresh air comes in from another opening. Maybe that will help.
Hugh
From: theo van duin (t.j.vanduin(at)gmail.com)
Sent: Wednesday, September 01, 2010 6:25 PM
To: allegro-list(at)matronics.com (allegro-list(at)matronics.com)
Subject: Re: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin air
Hugh,
Tiny grass particles were found earlier at the backside of my instrument panel also
and on the cabin floor. Not that much because we mainly used paved runways.
How to solve this problem is a challenge to me too.
Theo van Duin (France)
Allegro 2000
Rotax 912UL
71MM
2010/8/31, Hugh McKay <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)>: [quote] If you have an Allegro 2000 you know that the air intake for warm cabin air is under the bottom cowl. This is about a 2 1/2" round opening connected to a flexible duct that is connected to a s.s. shroud around the muffler where it picks up heat from the outside of the muffler and transports it to the cabin. The cool air intake is a similar flexible duct that brings in fresh air from a different location bypassing the muffler.
I keep my plane at an air field with turf runways. On numerous occasions in the summer during takeoff I have smelled what seemed like burnt grass, but it went away after leaving the ground. I believe that pieces of cut grass clippings are being kicked up by the prop blast and blown into the intake opening under the bottom cowl and thus back into the muffler shroud and burned. I this is indeed what is happening, how can this be prevented? Also recently when I had my Instrument panel pulled back for some electrical maintenance, the backside of the panel, as well as the instruments and the wiring was covered with grass clippings! This really surprised me. What a pain it was to clean all the dirt, dust and grass clippings out. Has anyone else who keeps their plane at a turf field had this experience?
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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