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Abrupt pitch variations (Read 651 times)
Nov 19th, 2017 at 5:20pm

GWMotley   Offline
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I love flying!
Colorado

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I have tried twice to follow the published autopilot tuning guides. Even starting in simplified mode for roll axis the autopilot will pitch significantly up and down and am unable to begin tuning. Any thoughts guys on setup?
 

Sonex built and flown
Zenith CruZer built and flown
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Reply #1 - Nov 19th, 2017 at 8:32pm

wmince   Offline
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Clearwater, FL

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GWMotley wrote on Nov 19th, 2017 at 5:20pm:
I have tried twice to follow the published autopilot tuning guides. Even starting in simplified mode for roll axis the autopilot will pitch significantly up and down and am unable to begin tuning. Any thoughts guys on setup?


Before anything else, on the ground, did you perform an autopilot servo test?
If so, I assume the test was successful?
 
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Reply #2 - Nov 19th, 2017 at 9:23pm

GWMotley   Offline
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Colorado

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Yes the initial ground test was successful.
 

Sonex built and flown
Zenith CruZer built and flown
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Reply #3 - Jan 20th, 2018 at 4:12pm

David Brown   Offline
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Are you using the inner most hole on the servo arm that you can without over centre issues? If not do so.

Then check for slack or backlash in the control rods/cables etc. There needs to be hardly any.

Slack in a rod end or anywhere will drive you nuts  Shocked
 
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Reply #4 - Jan 22nd, 2018 at 4:05am

jakej   Online
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Australia

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GWMotley wrote on Nov 19th, 2017 at 9:23pm:
Yes the initial ground test was successful.


Can you post a picture of the servo & mount - could be useful  Wink
 
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