DJI S800 Hexacopter Crash In the filming of Gold Rush

This popped up in my feed, so i thought I'd share.

Views: 10318

Comment by mdisher on December 23, 2013 at 10:07pm

GPS Glitch?  :)

Comment by Quadrocopter on December 23, 2013 at 10:12pm

I love the Youtube comments... "maybe they should find a better pilot" maybe it's too cold, "i bet they didn't calibrate".... etc...

The truth is they are cheap fun copters, using a DJI product for commercial purpose is wrong.

Like it or not :-)

Merry Christmas !!


Comment by Muhammad Al-Rawi on December 23, 2013 at 10:20pm

The dramatization is hilarious. 

Comment by Randy on December 23, 2013 at 10:51pm

Yes, I'm with mdisher, it looks like a GPS Glitch to me.  I wonder how well AC3.1's glitch protection will work.

Comment by Craig Burden on December 24, 2013 at 1:28am

"This thing is moving at whatever speed it is, with these carbon fibre blades." 

I don't really see what the relevance of the last part is!

You have got to love dramatic TV moments

Comment by Jiro Hattori on December 24, 2013 at 4:24am

I suspect that compass is getting crazy by odd magnetic field in such a place.

Comment by Greg on December 24, 2013 at 5:20am
So that's why everyone is wearing crash helmets :-)
A must see for ALL commercial operators as this will most likely happen to you!
Comment by Søren Kuula on December 24, 2013 at 7:34am

If it could have been a GPS glitch, there is one thing I don't understand. Why are flight control algorithms made with so much GPS and/or authority that a fail there can cause them to plummet into the ground?

I know an old-school system where the AHRS and the stabilisation/leveling worked without GPS at all and with minimal compass dependency. Flying autopilot, you could limit the maximum virtual stick input the GPS based autopilot had; with reasonable limits the copter would fly fast enough in auto, but would never zip into the ground.

Okay, the AHRS was not corrected for centripetal forces by GPS. If you wanted to fly the level estimate off level, could could do it (fly some tight circles). But who would want to do that?

I wonder if old school was not better after all?



Comment by Rob_Lefebvre on December 24, 2013 at 9:08am

No, it was not better.  I don't think any GPS glitch could affect our AHRS estimate that much.  I've never seen it.

This issue with the DJI products is not just a simple GPS glitch, IMO.  It seems to be a really bad bug in the firmware.  I've seen several accounts of very experienced pilots getting hit with it.  It's not just a case that people don't know how to fly in manual, but that the machine does not allow any control.  You can flip to manual, but it just keeps zipping off.

Even Trappy got hit with this.

People often say "Stupid newbs, they should just switch to manual but they don't know how."

That's just an elitist comment from somebody who doesn't really understand the problem.  I'm not saying all of these events are cases where the system doesn't respond to a mode change, but at least some of them are like that.

Comment by Bill Bonney on December 24, 2013 at 9:31am

And the biggest problem with the DJI products is that you have no real way to determine what went wrong. No tlogs or dataflash logs for post flight analysis. 

Personally I have the suspicion that some of these indicidents are due to low battery. Remote location, test the hell out of the copter to make sure it works ok, draining the packs they have, don't have enough batteries and fly with a part depleted pack, for too long for the final shoot. And remember that last shot, he was in position waiting for the shot... flat pack could easily occur. And not really going to admit that on camera.


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