Ok so tonight I have just finished connecting my new gps module to my tbs discovery running 3.1 and an apm 2.5. I have 2 hours flight time on this drone with only stabilise and alt hold and 0 problems at all.

I got a UBLOX NEO-6M from unmanned tech and set about mounting it etc before test flying tonight. 

Here is the sequence of what happened:

-Wind 8mph

-Took off in STABILISE

-flew around a little no problems

-switched to ALT HOLD no issues

-switched to LOITER and took hands off the sticks, severe drift in one direction with a steady climb in  altitude but responding vaguely to throttle and cyclic input.

-switch to STABILISE no effect the drone appeared to remain in LOITER

-slowly managed to reduce height and bring in for a landing 

-wobbly landing as very minimal cyclic control, while on ground the drone would not DISARM and took off  again while throttle at 0%.

-as it took off it caught a blade loosening it which in turn caused it to flip

-I powered off by unplugging battery (props still trying hard to spin)

Flight 2:

-GPS unplugged

-took off in STABILISE did not feel normal, severe drift in one direction

-switched to ALT HOLD, same problem again that I had with LOITER mode

-managed to land quickly

-would not DISARM

-had to hold it down with 1 hand and slide my left hand under the spinning rotors and slide battery plug  out. 

Below is a screenshot of the autopilot before heading out (no fix as in my house)

Any help or suggestions welcomed, I am about to recalibrate the accelerometers and compass and will try again tomorrow with no GPS unit attached.

Mike

Tags: discovery, loiter, tbd

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For the motors spinning, check and see if it went into land mode.  Might have been caused by a low battery failsafe.  If it did, check the min throttle it is set to.  mine was high enough to keep my quad a few inches in the air.  it would also keep the motors spinning and not let it disarm.

Thanks for that I will check the fail safes and throttle. The battery was full but I will look at that anyway, one thing I did notice was the 3 position switch on my transmitter had somehow assigned loiter to the position where stabilise had been previously. I think this could of been a major factor that and I am unsure if I had a good GPS lock as I hadn't looked for the blue light on the apm. I t is not possible to see the lights on my GPS unit unfortunately as I have beefed it up a bit to stop it being damaged by the elements. (see pic's attached)

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Posting your dataflash logs would be better if you want some suggestions...

I wasnt connected to my ground station, so im guessing I will have no logs?

Thanks for that! ill get them up as soon as I can.

Thanks,

ok here are the logs for the 2 problem flights. 

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Need the .log files

The TLOG files are attached, there was also RLOG?

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Really, its just the .log file we need that you got from Mission Planner when you downloaded the logs.

Same here.

Motors working at about 30% throtte and lost connect with fc. No disarm, no

telemetry not tx. Spinning rotors and I was lucky to plug out battery.

 

 

@Xian06: sounds like you were in another mode. Again, logs or its just guesswork...

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