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1. 02:42 AM - Re: Autopilot (aerosiam)
2. 10:19 AM - Re: Autopilot (ledson)
Message 1
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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
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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
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