Had crash twice when operated in loiter mode recently and I am not able to understand the actual reason for it. From the log I am seeing the current position shown is not as expected from what copter was at. Could you please help me to figure out the actual problem here ?
attaching the log files for reference 2020-02-01 22-24-51.bin (878.1 KB) this is with two gps in blend mode both ublox neo 8m
I had a quick look at the 2020-02-01 log (the other one is Copter-3.6.11 so I’ll ignore that one). It looks like maybe the vehicle didn’t actually takeoff? It seems to be bouncing around at a very low throttle level.
The number of satellites is quite low at only 11 but the hdop is not too bad at 0.8 to 0.9.
Maybe you’re just being a little too cautious taking off?
Wondering what does the circled portion mean ? the gps module was not sending any data during that time ? May be because of landing ?
I see a ramp down instead of a step wave. How better to interpret this ?
By the way this is on the stabilize flight for which I said things were fine
I believe yes since the other flight which was in stabilize had everything same except a different battery pack and the flight mode. One thing that is surprising is the position estimate shown in the map and the actual position shown by GPS. calculated actual position was wandering around as seen in the map view for
How big is this copter?
It is grossly overpowered which is the start of your issues.
Have you been through the Tuning page in the Wiki?
Your desired and actual look OK until it hits height, and maybe they separated due to its inability to reduce power enough for controlled decent.
Once you have been through the tuning Wiki page I would suggest adding weight (maybe a bigger battery or a second battery) and try again.
I did notice you were caught out by having the throttle down when armed in Loiter, and not realising it has a delay (it thinks its below ground) when raised above neutral because of this.
I strongly recommend getting it flying well in Stabilise, followed by AltHold and then Loiter.
That way you check all the basics first before expecting a miracle in Loiter.
Thanks for the info, but I am not fully convinced here.
Its a typical 450 frame with 1400kv a2212 motor with 30a esc and 1038 prop. I had successful flights with 1045 prop in loiter without any problem (the gps module had some problem recently - magnetometer was not giving orientation- because of the crashes from my bad piloting and changed with the new one). This flight had a higher capacity battery with 1038 prop. So there is something more to it I guess than overpowering. Since I had some problem in all recent Loiter irrespective of firmware version and basic configuration, a quick look again if possible will be of great help.
should have also had the same problem if it was because of overpowering since setup is same apart from the mode, battery and some rc sensitivity(again, I guess).
Should I suspect my GPS module since I see some gps related error messages in log
Yeah, I had not gone to the extend of tuning since I was happy with the performance before
BTW which is this wave plotting tool ? I am having difficulty when the values are not having comparable magnitude in mission planner for a combined analysis
Other than a quickly sagging battery there isn’t much to be learned from this log. It didn’t fly long enough to capture a MOT_THST_HOVER value which is still at default. In fact much of what I see is at default. Follow the guidelines in the tuning Wiki as suggested before flying again.