139 jockey
Member
I recently had a rather unfortunate incident whilst doing a power line inspection job. To cut a long story short I suspect that it could have been induced by EMI from the lines. The symptomes were (Wookong FC) that in GPS/ATT when approaching target pole the GPS hold did not kick in with sticks released. This obviously raised the alarm with me so I got the UAV away from the infastructure and out over an open field. There was a heavily loaded (cold morning) 33KV line between me and the UAV at this point, I was about 10 M from the line and the uav 25m the other side. It continued to do erratic stuff, hard to peice it together ( as all you fella's who have bent Multi's know!) but I think I still had control of altitude but not of roll. The UAV Waffeled about in roll for a a fwe seconds then rolled to 35* AOB( the preset AOB limit, which indicates I guess that the IMU was still doing it's job), did not respond to stick inputs, and left me with little choice than to accept a solid precationary landing. I stayed in GPS/ATT through out, but in hind sight (a very powerfull thing) should have gone to ATT, but it all happened too fast really.
I have and IOSD on the UAV, 10 sats in view and batt V about 20v (5S) so nothing supicious there. I have done about 60 hours with this UAV and no issues like this in the past, but had just changed to a DGI IOSD & 5.8 ghz downlink mounted on top of the UAV close to the Futaba Receiver which could possibly have caused some interference / range issues. I stupidly hadn't done a full range check on the new set up due time pressure, and wonder if this may have contributed.
Any thoughts would be greaty appreciated.
I have and IOSD on the UAV, 10 sats in view and batt V about 20v (5S) so nothing supicious there. I have done about 60 hours with this UAV and no issues like this in the past, but had just changed to a DGI IOSD & 5.8 ghz downlink mounted on top of the UAV close to the Futaba Receiver which could possibly have caused some interference / range issues. I stupidly hadn't done a full range check on the new set up due time pressure, and wonder if this may have contributed.
Any thoughts would be greaty appreciated.