Re: [Paparazzi-devel] Roll PGain Help, servos always twitching

[David Carlson]

Eddie,

You aren't fully understanding the difference between manual and auto1.  
Manual you are commanding servo positions.  But in Auto1 you are 
commanding roll/pitch angles.  So if you tell the autopilot to try to 
reach 25 degree roll, and nothing changes, the control laws will 
probably cause the control surface to twitch trying to get more 
authority, but trying to not overshoot.  This all comes back to what 
everybody has said, auto1 should be tuned in the air, at a comfortable 
safety altitude so that you can recover should something go wrong.  And 
on that note, it would probably be best to have a flight buddy to help 
do tuning.  One to fly, and one to monitor GCS.

Buzz

On 08/18/2010 07:17 AM, Edixon Giraldo wrote:
> Hi, I am working on adjusting the roll gain for my aircraft. I have not flown 
> it yet, but, on the ground I did an rc control test in Auto1 to check surfaces 
> for correct movement and travel. I have noticed that when inputting roll 
> commands from the radio the servos always twitch. I imagine this is what causes 
> the oscillations in mid air. I then reduced the gain several times until I got 
> to 1000 and the servos still were twitching, but, there was very little travel 
> of the ailevons. What variable am I supposed to adjust at this point?
>
> Thanks.
>
> Eddie.
>
> Sent from my iPhone
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>