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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

Posted: Tue Aug 31, 2010 1:05 pm Post subject: Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin

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)

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

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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