ArduCopter User Group

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Crash analysis - spinning nosedive from 60m

Started by nickthecook 8 hours ago. 0 Replies

I had a crash yesterday from about 60m. The Y6 is not looking good. I can fix it up, but I can't figure out why it crashed.I have dataflash logs and FPV video from the flight. The FPV camera has seen…Continue

Unexplained fly away logs here but don't quite know how to interpret.

Started by Sean Headrick. Last reply by Randy 19 hours ago. 5 Replies

We were doing a demo for some water resources groups here in the SF north Bay area along the delta showing salinity gradients at specific GPS locations. The protocol was to take off in auto mode and…Continue

Quadrotor fly away

Started by Saurabh Ladha. Last reply by F. C. Bearsch "Tearig" on Monday. 11 Replies

Hi,My quad is running on Pixhawk and I use a FlySky TH9X radio (typical DIY Quad kit from 3D Robotics). The firmware is ArduCopter v3.1.5.This morning, my quad started flying away (it might have been…Continue

Tags: away, fly, connection, lost

MavLink Failed

Started by Michael DuQuette. Last reply by Robert Fenney on Sunday. 1 Reply

I'm having an issue similar to the issue Oliver is…Continue

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Comment by Daniel Chapelat on September 14, 2012 at 5:59am


une petite question: avec Mission Planner 1.2.11 comment avoir la fonction "Prefetch" ? le bouton a disparu!!


Comment by Zachary Koh on September 11, 2012 at 8:28pm

Hmm, we've just received another bigger, heavier, more powerful quad. It was passed down to us from a couple of people who have flown it fine before.

After re-assembling it, we tested it's flight. During rolling, the motors on the relevant side are supposed to power up to allow it to roll, however one does not do this. This is the same when rolling in either direction. Does anyone know a fix for this?

Thanks. X)

Comment by Randy on September 10, 2012 at 7:51pm

@Zachary re getting help understanding the arducopter code,

     You could start a discussion (which allows threads in the reply) here or in the "Learning to program the ardupilot mega" group.  Good luck

Comment by Zachary Koh on September 10, 2012 at 7:43pm

Hi guys,

I'm relatively new to the arducopter/plane scene (just started in June). A group of friends and I are trying something ambitious as our first project that requires some coding which I am supposed to do. I was hoping to find some help/people to consult here. Would this be the right place to ask such things? It'd be pretty awesome if someone who completely understands the arducopter code could see this.

But any help would be greatly appreciated.


Comment by Randy on September 3, 2012 at 9:05am


     At the moment, we don't have a good way to do that.  What you need one of the pwm output channels (like channel 10 or 11 maybe) from the APM to be an unmixed throttle value.  At the moment, for all motors we mix roll+pitch+yaw+throttle to arrive at a final value..

    I can see why you want to do this of the successful copters in the hobbyking beer lift had an extra prop on the top in the middle for just this purpose.  Of course I guess you could likely accomplish the same thing by just increasing the size of the other 6 or 8 motors your have...but maybe i'm missing something.

Comment by KANCHANA ATTANAYAKE on September 3, 2012 at 7:09am

I am starting to build a APM 2.5 board based quad and i have few questions since i am new to this. if i want to add two extra counter rotating motors which are purely for thrust only ( just to increase the endurance) powered by a separate battery, how should i couple it to the throttle channel of the program? just wondering how to make them (two extra motors) take over 90% of the thrust at alt hold, level flight and ascending and descending in order to take off the burden off the other four motors. i guess mixing would do but really need some help when its on auto flight. thanks  

Comment by Gustav Kuhn on August 13, 2012 at 10:55am

Hi Chris,

I did get a new board :-)

But you have to multiply our currency by 10 to get that new board :-(

And I think we ain't the only ones in that boat either....

I'm in the almost fortunate position to almost afford to go this route, as I did, but I still think that there are some frivolous features in the latest code.

Most people laid out cash to do fpv, airframe stab for camera work, and nav, not to watch nice LED displays, and aerobatic moves.

For that you can by a much cheaper controller from Hobby King.

The very much improved BASIC code will fit on a 1280. I think.

Then draw the line.

The rate the code is improving, APM1 with a 2560 board, is also going to be kept hanging soon.....

I'm also still flying a fixed wing on a 1280 board, very happy with it :-)

And the redundant 1280 card is going into my "Mars Rover", yes I suppose I'm fortunate :-)

3D Robotics
Comment by Chris Anderson on August 13, 2012 at 10:13am

Gustov: I'm sure there are ways to trim more of the code to fit, but you'll have to do it again with every release, which seems like a hassle. You don't need a new APM to get back in the fully-supported mainstream. Just upgrade the base board to a 2560 ($64) and you're done.

Comment by Gustav Kuhn on August 13, 2012 at 10:08am

Hi Chris,

Thanks for the reply.

Yes, out of memory/too large for 1280.

By disabling things like cam stab, mount, etc (and probably things I shouldn't disable), I'm at a point where I'm only about 5.5 kilobytes too big still.

Not on the computer I used earlier today, so can't say exactly what I did.

Messing with the GPS defines doesn't make any difference, neither does Copter Leds.

I'm not sure how to remove bits of code like Flip, Toy, etc, and not too sure how much space it will save.

It would be a shame to turf the 1280 boards, I already upgraded my quad to 2560, but am involved to a certain extent with a LHS, that now has to explain to irate customers why a system that that was expensive, and promised a lot, now should be replaced, to deliver.

And I have to say, 2.7 has awesome loiter, even in a frisk breeze.

I really would like to try a waypoint mission, but we are finding out the hard way, why the old sailors called this place, "The Cape of Storms" !!!

3D Robotics
Comment by Chris Anderson on August 13, 2012 at 6:13am

Gustov: what compile error? Is it an out of memory one? As I mentioned I don't have a 1280 and it's not officially supported anymore, so I may not be able to help on this one. Perhaps someone else can. 


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