First I’d like to state that we’re new to APM (Arduplane) so I apologize in advance if the problem is something minor and simple or we’ve given incomplete information.
We’ve done a couple of flights with basic missions (20ish and 8ish waypoints) and came across some problems. We couldn’t manage to do a single proper auto mission which led us to frustration and then here
Our setup is :
-APM 2.6 board (latest firmware)
-3DR GPS + compass (external)
-Volantex Ranger 757-3 plane
-Motor: T-Motor T60A 400 Hz ESC 2-6S 3A/5V Bec
-ESC: JP EnErg 600 O/R 1100 (C35-14) 3-4S LiPo
-Prop Size : 10X7
The things we’ve done pre-flight:
- Initial setup via Mission Planner wizard (we’ve done this in another area, not on flight site).
- We’ve waited for APM to initialize and GPS lock (8-9 satellites).
- We’ve configured our transmitter switch to switch between auto and manual modes.
- We took off manually and switched to auto mode mid-flight.
- All parameters are left default.
So we’ve came across 3 problems.
First was toilet bowling. When we switch to auto mode mid flight the plane goes straight or make a good turn for a couple of seconds, then it starts toilet bowling, constant turn to right and going down. After our research, we found out that this could be because of 2 things, not enough air speed makes APM go into stall or magnetic interference on compass. Since our compass was near of our components we’ve replaced it on the top of the plane away from components (front facing forward and leveled).
In one flight it dove to the ground when we switched to auto then on another flight same toilet bowling effect happened. So we thought it was not GPS related and we removed air speed indicator to let it calculate air speed by its own, to prevent any possible false air speed indicator values leading apm to stall. After we’ve done that APM was constantly throttling up and down on air. Making some turns or going straight but completely ignoring the mission and waypoints but atleast was staying on air, not diving or toilet bowling.
Obviously we’re missing something and hoping that someone could help us about these issues.
Our tlogs are attached, sorry for so many manual auto switches Also there’s a dataflash log of our last mission.
Thanks in advance.