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Never seen any failure in compass calibration, always works fine, white light for 3 seconds. I have done this a few times, usually at new flying sites. No effect on problem.

BTW, I apologise if I'm starting to sound a little peed off, I am grateful for the input, but the comments people are coming back with now have no relation to the actual issue in hand. But then I understand this is kind of to be expected as we are all running out of ideas! To be honest, I think...

If there were any issues like you say, then we would experience the same issue when in gps hold, and when returning to home after being manually walked across the field (as stated before), and this is not the case, it holds great in gps, even in gusting 20mph wind. Also you would see them in gps...

He didn't say compass, he said gyro. Completely different sensor Aviator. Nowhere that I can see is it mentioned about calibrating the offset of the gyros. This would also be pretty silly as it would change every time due to temp. A good kalman filter will track the bias correctly. And I'm also...

Battery level set. Not sure what 'declination setting is'? How do calibrate the gyro, I thought you didn't have too. And no I didn't move the model. But any gyro or IMU error should show in all flight conditions no?

Sorry Boris, I didn't see the video! Yes this is the same problem, although I would say mine is more exaggerated! Where did you find that?

Seems like a different issue. No chance of any flying for me in the next week, so I'll have to pick this up later. will make video and send to DJI, if they can't help I shall be sending this back and buying a hoverfly.

Yes but what's strange is it does kind of work in the fact that it goes up, flys to home position. BUT, whereas the naza does this nice and smoothly, the WKM does it like its just had 3 bottles of monkey shoulder, it bucks about in both pitch and roll as it does it.

What I will do is put together a video showing the behaviour, both good and bad. Then send this to Geoff at quadcopters.co.uk, I have pointed him towards this thread as suggested but haven't heard anything back.

will try that but remember this is not just failsafe, its also when i turn on RTH manually

Yep exactly that, weird as hell huh!? She literally flies beautifully in all modes and GPS hold is perfect, but as soon as i enter failsafe or RTH she goes nuts! Have tried another firmware re flash, but exactly the same I'm at a complete loss

Well, the yaw problem went away as quickly as it came. Seems nothing to do with prop size on 3s, as running 8inch on 3s or 4s now results in no yaw problems thanks for the heads up with the IOC, this is now working correctly I think. Poi mode is a bit of a mystery at the moment but I'm sure...

Yep will try this. Just to be double clear, at no point was the video TX hooked up the BEC of the WKM. Only the camera was connected to the MCU, and was pulling a verified 60ma max.

Sounds like a plan, I have already identified good switchers that have very low levels of RF noise. But just to check, are you saying use a separate lipo for video stuff, or just use a regulator, large cap, and tie the gnds either side together? Cheers

I hear you on that, but its worth mentioning again that the VTX is not powered at present. Also just tried without the camera plugged into MCU, same buckaroo effect. So it looks like we can rule both Camera and VTX out as causes. :( GPS is mounted on the longest pole, 15cm above IMU, and obvs...

Ok this makes sense I think, and I take that the reason you don't see this phenomenon on the 450 quad is that there is and overall reduced amount of torque effect because of the 2 less motors? I am surprised however that no one has mentioned this before on the forum or that it is not mentioned...

Yep that makes sense re switches. Currently I am using DJI 8" props with 3s and 4s on stock 920kv DJI motors that come with f550 frame. I have not tired DJI 10" props yet. With 3s I get a reluctance to yaw right and a heavy yaw to the left on power. I have to trim about 3/4 to the right to keep...

Ah this may be it for IOC issue. Thanks for the heads up. so if i reluctantly accept i can only fly on 4s for some reason that hopefully just an error on my part it just leaves this buckaroo style RTH and yeah, RTH / fail safe is still screwy on 4s

Hey, thanks for the input, but it might be worth reading all the posts for the full picture. she flies happily by stick in all 3 flight modes, apart from yawing to the left on rapid accent when running 3s. note that this is also the case in manual mode. With 4s no yaw issue. all controller...

Yes I think a can bus error is likely, especially due to all the odd errors showing in list and perhaps linked to why the iosd did not work? Will try the naza on Tuesday if I can.