---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Tue 06/29/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:42 AM - Re: Autopilot (aerosiam) 2. 10:19 AM - Re: Autopilot (ledson) ________________________________ Message 1 _____________________________________ Time: 02:42:05 AM PST US Subject: Allegro-List: Re: Autopilot From: "aerosiam" I fitted a 2 axis Dynon autopilot to my Allegro 2000 a while back. The installation is straightforward and both servos fit nicely to the rear side of the bulkhead under the baggage shelf For various reasons, I have only tested it for a few hours. My initial impression in the fairly brief testing was that the response to the pitch servo was excellent and it maintained or changed height in a fluid movement. The roll servo response was a problem even after adjusting the various settings on the Dynon setup. As the plane rolled out onto a new heading, the adverse yaw slewed it off the target heading by a few degrees. This repeated so it was constantly rolling, missing and correcting. There is no 'aim-off' setting in the Dynon. The Allegro has a 3:1 differential built into the bellcrank in the cockpit but it is progressive and at small deflections there is no differential. We tried a more 'aggressive' setting on the Dynon program with larger deflections (by setting a higher roll rate) hoping the differential would be enough to counteract the yaw as the plane rolled out onto a heading. It didn't work and the plane started hunting left and right across the heading in progressively sharper movements. The co-pilot described it as 'getting ugly' and we stopped. I posted the problem on the Dynon forum but they responded by email not on the forum. This may suggest that other people are having this problem. A friend has a Technam with Tru-Trak system which works very well. It seems to 'miss' the correct heading by 10 degrees, then gently reverses the roll and settles perfectly on the correct heading. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=302954#302954 ________________________________ Message 2 _____________________________________ Time: 10:19:38 AM PST US Subject: Allegro-List: Re: Autopilot From: "ledson" Paul, thanks for the information. Your experience with the Dynon system is informative. I believe that if I was going to install one on my airplane I would look at using a Trutrak system. From the people that I know that are using the Trutrak autopilots I haven't heard any complaints. I've flown a Evektor Sportstar that had a Trutrak and I found it very easy to use and held the course that it was set on plus it linked with the Garmin GPS quite well. Do you have any photos or information that you can share on the mounting and placement of the servos? Thanks, Larry Read this topic online here: http://forums.matronics.com/viewtopic.php?p=303009#303009 ------------------------------------------------------------------------------------- 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.