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Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin

 
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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Tue Aug 31, 2010 1:05 pm    Post subject: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin Reply with 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
[quote][b]


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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Wed Sep 01, 2010 3:08 am    Post subject: Re: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm c Reply with quote

Hugh,

Though I operated our Allegro from grass strips occasionally, it was always based on a paved airport so I never noticed any grass clippings problem. Are you getting any grass clipping accumulation on the intake side of the oil cooler?

I would suggest a fairly coarse screen material covering the air duct inlets which can be easily cleaned during pre-flight.


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Thom Riddle
Buffalo, NY (9G0)



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