i am currently designing and testing a 3d printed Tailsitter with arduplane.
Sadly i am facing a problem that i am unable to solve on my own.
Right after takeoff the drone oscilates heavily in (mostly) the pitch axis until it crashes.
I am following the Tailsitter tuning tutorial, but after trying a lot of different things like changing the ff, p, i and d values as suggested i am not able to change the behavior.
can anyone hint me to what to try next while i rebuild the plane for the third time?
All of the flights were done in QLoiter
Thank you so much in advance!
First, try hanging the plane between two trees using ropes, I did this first time I was setting my tricopter VTOL.
You seem to have instability possibly to too low PIDs. or too slow acting servoes, although when looking at the video, I see rather fast and correct deflections of the ailerons. What I also observe is that it seems like the front part of the wing is falling through when the wing passes the vertical. It could be that the ailerons are not sufficiently large or that CG is incorrect, too far forward? Not sure at all.
Why are arming checks disabled? This is the first thing to fix, put the parameter back to 1 and resolve any issues they raise.
Qloiter is not suitable for such maiden flights. You want to minimise the number of controllers running so you a narrow down which is causing the issue. Qloiter is attitude controller, altitude controller and position controller. QStabilize is a better place to start as only the attitude controller is running.
Just from the vid I think you need higher pitch rate gains, turn them up slowly. You will have to patient taisitter pitch axis are one of the hardest to tune.
Thank you both very much for your inputs!
I think i disabled the arming checks for testing the motors without gps lock, but reverted it back to normal now!
I will try the things you suggested and report back.
Thanks for helping a noob