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Overshooting heading in nav mode only (Read 239 times)
Jul 31st, 2018 at 6:28am

Ricksol   Offline
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Tech support,

Here is an interesting behavior.  I fly an RV10 with Dynon Skyview HDX, currrent software.  My autopilot is pretty well tuned and rolls out on heading pretty accurately when using heading mode.  However, when in nave mode and performing a turn in the flight plan, it overshoots heading by about 5 or 6 degrees, then corrects back.  This is using the Garmin 650 for navigation, and the Garmin is set to anticipate turns, which it does (but still overshoots heading).  Any thoughts on why this is happening?

Thanks,

Rick Solana
 
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Reply #1 - Aug 1st, 2018 at 4:36pm

Dynon Avionics   Offline
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So the first question - when you're seeing these behaviors is the nav mode flag in the AP top bar indicating GPSS (gps steering?)
 

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Reply #2 - Aug 1st, 2018 at 5:13pm

Ricksol   Offline
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Yes it is.  Nav being driven by the Garmin 650.
 
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Reply #3 - Aug 2nd, 2018 at 4:27pm

Dynon Avionics   Offline
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So in that case, we're following roll guidance that the GTN is generating. In other words, the GTN is commanding the aircraft pretty directly. What are your roll limits set to?
 

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Reply #4 - Aug 6th, 2018 at 4:05am

Ricksol   Offline
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The Dynon autopilot roll limit is set to 25 degrees.
 
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Reply #5 - Aug 10th, 2018 at 6:15am

kellym   Offline
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Ricksol wrote on Aug 6th, 2018 at 4:05am:
The Dynon autopilot roll limit is set to 25 degrees.


I fly an RV-10 with essentially the same setup, although older variety of screens. I would suggest lowering your roll limit to about 22 degrees. I think you will get better performance by limiting the AP to essentially a standard rate turn.
 
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Reply #6 - Aug 11th, 2018 at 4:58am

Ricksol   Offline
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Great point.  I will turn it down.  Thanks.
 
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