LibrePilot Forum
Users => Vehicles - MultiRotors => Topic started by: Parris on July 05, 2018, 12:05:24 am
-
LOS flying . ZMR 250 Thug .
Flips and rolls .
I'm very happy with the way this craft flies aggressively , and / or , passively . Depending on which Mode I'm set to . I have three Flight Mode settings . Progressively snappier from one to three .
My question :
When I am in Mode 3 , Rattitude>Rattitude>AxisLock>CruiseControl , my craft hesitates , oscillates or bounces at around 10 degrees before coming back to level . I watch that in flight , and my automatic response is to just adjust my sticks .
I can handle it . It's not a big problem when I'm in the open field flying . But , I don't always fly in an open field . I sometimes fly in a confined area . That's when it becomes tricky .
Any suggestions ?
Thanks ,
Parris
-
Oscillation means your PI(D)s are too high.
You didn't mention whether you were using different PIDs for the different FMS positions.
I would consider enabling TPS in Stabilization->Advanced.
I have a similar Rattitude setup, and it helps a lot to simply release the stick sooner.
-
Thanks TheOtherCliff .
I think my PID's are all about the same on each Flight Mode . I'll enable TPS on the snappier Flight Mode , ( 3 ) , and experiment with it .
I just didn't want to upset all the other adjustments I had made in the other Flight Modes .
Thanks a bunch ! I'll start working on that now . Run a few batteries . And, report later with my next issue .....lol.
Thanks ,
Parris
-
Settings picture in attachment .
-
Oh yea... Oscillation can be caused by ESCs running a slow old protocol like PWM@50Hz which needs lower PIDs than the default ones. If that is the case, instead of lowering PIDs, you should use a better ESC protocol/rate, at least PWM@490Hz or PWMSync.
-
I have Little Bee 20 amp ESC's . I've been flying this off and on for 2 years .
Output Configuration file attached .
-
Your PID settings looks like just defaults.
Try lowering the Outer Loop Pterm from 2.5 to 2.0
You should do some tuning and lower a little bit the "P" term values on Rate/Inner loop.
-
Thanks , f5soh . I'll try that adjustment . Waiting for the summer showers to end first .
-
I have a kingkong 300 hex that has been a nightmare to get airborne. But, finally took flight today, but i noticed, it has a twitch, and shutters a little. PID's issue?
Sent from my Moto E (4) Plus using Tapatalk
-
PIDs are usually a regular oscillation. Twitch and shudder sound different than that. A video, best from on board, would help.