---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Tue 08/31/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:05 PM - Allegro 2000 - Rotax 912 Muffler - Air Intake for warm cabin air (Hugh McKay) ________________________________ Message 1 _____________________________________ Time: 02:05:40 PM PST US From: "Hugh McKay" Subject: Allegro-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message allegro-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Allegro-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/allegro-list Browse Digests http://www.matronics.com/digest/allegro-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.