Hexacopter flew away/disappereared

[supertabouret]

Hi,
I need help to figure out what lay have happened.
I recently crashed my hexacopter dji wookong si I sent it to the guy who is professionnal and who built it for repair. The repairation cost me 1000 dollars.
As he said, he made all the tests and failsafe, blablabla..

Then FIRST FLIGHT.
Used process. Radio on. Drone on. wait for GPS. 9 GPS done.
I take off in ATTI. 10 meters switch to GPS MODE. Ok go 60 meters hight. Take photo. Then I switch back to ATTI mode to go faster to annther point 150 meters from me.
I try to shwoth back to GPS not possible. I look at the reception of transmitter. ZERO! No reception. There were no trees nothing, sky clean...nothing between me and the drone.

I hope the failsafe switches on. But nothing the drone disappears.
What do you think?

Should I be doubtfull about the reparation of the drone?
Thank you for helping identify exhaustively what happened!

 

[Scott Drysdale]

More information is required to help you with this,e.g.,
Did you return the FC to GPS mode before attempting to activate the fail safe switch?
What RC radio system did you use with it?
For the $1000 you paid for repairs, were any DJI parts replaced such as FC or GPS/compass module?
1) Was the failsafe function verified on the Hobby Bench with the failsafe switch activated and with DJI Assistant software before flying?
Most important: Was the failsafe function verified on the Hobby Bench by means of DJI Assitant software with the RC transmitter turned off?
2) Where there any other rf transmitters installed on the MR such as FPV video downlink of GCS xmitter?
3) Where you flying anywhere near to a cell tower or radar station?
4) During hobby bench testing with DJI Assistant, did you check to confirm that the RC radio xmitter switches were not conflicting with each other from the perspective of Assistant software behaviour.

 

[Bartman]

did you do a compass calibration before flying after it was returned to you? how far was the repair shop from the place where you first flew it?

 

[Vojec]

Firs and best rule from Kopterworx: after crash replace WKM, (MC. IMU, GPS), period. Will be beter if you invest those 1000$ into new WKM.

 

[supertabouret]

did you do a compass calibration before flying after it was returned to you? how far was the repair shop from the place where you first flew it?

500 km
I will adjoint him but I have no knowledge with drone this is why I sent it to a shop.. !

 

[supertabouret]

More information is required to help you with this,e.g.,
Did you return the FC to GPS mode before attempting to activate the fail safe switch?
What RC radio system did you use with it?
For the $1000 you paid for repairs, were any DJI parts replaced such as FC or GPS/compass module?
1) Was the failsafe function verified on the Hobby Bench with the failsafe switch activated and with DJI Assistant software before flying?
Most important: Was the failsafe function verified on the Hobby Bench by means of DJI Assitant software with the RC transmitter turned off?
2) Where there any other rf transmitters installed on the MR such as FPV video downlink of GCS xmitter?
3) Where you flying anywhere near to a cell tower or radar station?
4) During hobby bench testing with DJI Assistant, did you check to confirm that the RC radio xmitter switches were not conflicting with each other from the perspective of Assistant software behaviour.

1/ yes it was and set for a go home action when 300meters from the take off place.
2/ no
3/ probably it was in town. but I flew there for months and nothing happened
4/ yes verified and checked

so ?

 

[skquad]

500 km
I will adjoint him but I have no knowledge with drone this is why I sent it to a shop.. !

Gps/compass recalibration would be required for that distance. But, not ding it should by itself not cause a fly away.

Sent from my GT-I9505 using Tapatalk

 

[haha49]

Gps/compass recalibration would be required for that distance. But, not ding it should by itself not cause a fly away.

Sent from my GT-I9505 using Tapatalk

not true it's very important when flying in gps mode. The naza works like this if you head west by 2 ft it says fly east to get back to the right spot. If west is east or it's off it flys the wrong way then says fly back harder so say it says head east it heads west then it says more east then flys faster and then it's gone. It's called a fly away and it does happen. That's why they warn you to stay away from powerlines.

Sometimes something blocks the signal as some towers aren't always on ect and that could of blocked the radio. The other thing was the RC remote battery low. When you switch from alti to gps in flight it changes the home location so it might not fly back home. Was it set to auto land or fly home mine is set to auto land no flying back for me land were it's is what I set mine to do. Is the attena on the tx lose?

Sounds more like human error then anything else to me. You flew far away you lost signal something some were could of done it. The wind could of caused it to drift further away then you thought since it was in alitude more and you sometimes don't notice it slowly or quickly drifting away. Were you fpv only or watching it in the air as well?

You took off in atti mode not gps which means the homelocation wasn't locked. Take off in GPS if you want the fail safe to come back. Always point the RC radio directly towards the craft for the best result.

 

[skquad]

not true it's very important when flying in gps mode. The naza works like this if you head west by 2 ft it says fly east to get back to the right spot. If west is east or it's off it flys the wrong way then says fly back harder so say it says head east it heads west then it says more east then flys faster and then it's gone. It's called a fly away and it does happen. That's why they warn you to stay away from powerlines.

Sometimes something blocks the signal as some towers aren't always on ect and that could of blocked the radio. The other thing was the RC remote battery low. When you switch from alti to gps in flight it changes the home location so it might not fly back home. Was it set to auto land or fly home mine is set to auto land no flying back for me land were it's is what I set mine to do. Is the attena on the tx lose?

Sounds more like human error then anything else to me. You flew far away you lost signal something some were could of done it. The wind could of caused it to drift further away then you thought since it was in alitude more and you sometimes don't notice it slowly or quickly drifting away. Were you fpv only or watching it in the air as well?

You took off in atti mode not gps which means the homelocation wasn't locked. Take off in GPS if you want the fail safe to come back. Always point the RC radio directly towards the craft for the best result.

Home location does not change in flight, regardless of changing flight mode (this would cause havoc). Also I believe home location is set prior to getting gps lock (I stand to be corrected on this point).


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[haha49]

Home location does not change in flight, regardless of changing flight mode (this would cause havoc). Also I believe home location is set prior to getting gps lock (I stand to be corrected on this point).


Sent from my iPad using Tapatalk

If you take off in altitude or manual mode the home location isn't set. If you fly in altitude mode it forgets it's homelocation and sets it to the last one if you goto gps 100m away I thinks that's the home location it will land if it only has x amount of power. Its a finiky system but if you read the manual it explains how it works.

 

[cbuk]

If you take off in altitude or manual mode the home location isn't set. If you fly in altitude mode it forgets it's homelocation and sets it to the last one if you goto gps 100m away I thinks that's the home location it will land if it only has x amount of power. Its a finiky system but if you read the manual it explains how it works.

Are you sure this is right?

From my experience, the initial home point is set when the craft finds 6 or more satellite, whether the flight mode is set to Atti or GPS. The manual states "Before takeoff, the current position of the aircraft will be saved as the home point when you push the throttle stick for the first time after 6 or more GPS satellites have been found"....no mention of this not happening if the FC is in Atti mode

If you change between GPS and Atti mode during the flight, the home location is not forgotten or reset. To reset the home point during a flight, you have to toggle the IOC switch three to five times (between which positions depends on how the IOC switch has been set up); I would add that it is really not advi sable to do this.

 

[skquad]

Are you sure this is right?

From my experience, the initial home point is set when the craft finds 6 or more satellite, whether the flight mode is set to Atti or GPS. The manual states "Before takeoff, the current position of the aircraft will be saved as the home point when you push the throttle stick for the first time after 6 or more GPS satellites have been found"....no mention of this not happening if the FC is in Atti mode

If you change between GPS and Atti mode during the flight, the home location is not forgotten or reset. To reset the home point during a flight, you have to toggle the IOC switch three to five times (between which positions depends on how the IOC switch has been set up); I would add that it is really not advi sable to do this.

+1

Sent from my GT-I9505 using Tapatalk

 

[supertabouret]

If you take off in altitude or manual mode the home location isn't set. If you fly in altitude mode it forgets it's homelocation and sets it to the last one if you goto gps 100m away I thinks that's the home location it will land if it only has x amount of power. Its a finiky system but if you read the manual it explains how it works.

Really??
I wonder how many people flying drone don't know that..

I used a Frsky. I wonder if the antenna frsky did not have a problem (loose)
Also the system was set to gohome when it is 300m far from its take off point

 

[haha49]

Really??
I wonder how many people flying drone don't know that..

I used a Frsky. I wonder if the antenna frsky did not have a problem (loose)
Also the system was set to gohome when it is 300m far from its take off point

The home location if locked might just land if the battery is low. Which is why you should always do the far away stuff right away. If it's to low home location means nothing.

 

[soler]

If you take off in altitude or manual mode the home location isn't set. If you fly in altitude mode it forgets it's homelocation and sets it to the last one if you goto gps 100m away I thinks that's the home location it will land if it only has x amount of power. Its a finiky system but if you read the manual it explains how it works.

Home Location is set when you have more than 6 sats and throttle goes past 50%, it has nothing to do with which mode you are in.