I built a hunter v-tail 500 quad several year ago and crashed soon after the initial build. Before the crash it was pretty stable. I’ve since then rebuilt the rear end with crash parts kit and am having trouble getting stable flight now. I’ve gone through re-loading *.wmi file and such and it seems to have a yaw oscillation when trying to fly now. Has anyone experienced the same. It seems that the tail section “rolls” and is not as rigid as I might hope and the multiwii board is trying to compensate for this roll. Don’t know if I should adjust PID on Yaw or if this might also be affecting the roll PID as well. Thoughts or experience dealing with the same?
If it was flying great before, it should fly similar if you didn’t change anything else.
However you can adjust the Yaw PID a bit as the VTail is very aggressive on Yaw.
Thanks. I dropped P on Yaw from 3 to 1 which improved it somewhat. I noticed the D on Yaw was at zero and I increased it to 20 (similar to pitch and roll D’s) which also seemed to improved. Hand held test is pretty good but occasionally it seems like it starts to fight itself and oscillate around the yaw axis (I think). Its hard to tell with the vtail configuration.
Have you had any experience or feedback on the tail section not being as stiff and rigid as it could be? If y is the front to rear axis, the v-tail section seems to be able to move slightly around the y axis (by hand) and I was thinking if the control board is sensing this movement and compensating for it, it could set up the type of oscillations I’m seeing. Any thoughts about this theory and how to compensate? I’m not an expert on PIDs yet but my PID on YAW is 1.0, 0.30, 20. With what I’m experiencing any advice on how to change these to dampen this further?
The VTail platform have some flex in the rear tail and it’s not the best “stable” type of frame.
It’s best for forward flight then super stable hovering system. 