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1. 02:05 PM - Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin air (Hugh McKay)
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| Subject: | Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin |
air
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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