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Max and Kinderkram thank you for reply.

Sergiu

Do you have a video of the multicopter in flight? Im curious if your problem is similar to mine where the vehicle kind of bounces up and down in PH.

Bouncing up and down is usually a navigation altitude Tuning Problem. Check the wiki. There is a nice vid explaning this behaviour and Tuning.

Cheers
Christof

Hi Max,

Just to let you know I finally got around to trying your test firmware ... and it's exactly the same as before

A short while after hovering it starts making its quiet *zing zing zing* oscillation and starts drifting in a certain direction quite noticeably (in this case backwards). If I give inputs on the sticks to keep the platform level, the HUD tells me the platform is tipping forwards

As you can see from the attached ACC plot, I'm still fighting a strange biased vibration which tends to be more positive than negative on Y and more negative than positive on X The full log file is available to download here if anyone would be so kind as to try and debug this problem with me:

http://www.horizonimaging.co.uk/rcgroup ... es/30-7-14

I've got some M3 rubber mounts here which I will try placing between the chassis and the AQ as a last resort ... I don't know what else I can try

Many thanks for any input chaps, it's much appreciated

David

Max

I tried your mod firmware on my octo and there was a big change in how is flew.

The wobble was completely gone with the change in firmware. I'm afraid I did not look to see the version I was flying with probably around r396.

The only change from defaults was to lower tilt rate D to 24600 for both firmwares.

The large octo with 17' x 5.5 props does have divergence in alt/pos hold. I'll try lowering D some more but I have two ESC32 and the rest are Simonk ESC so what could be some of the cause for divergence.

I'll upload the two videos tonight.

Larry

Here's the links to the youtube videos.

https://www.youtube.com/watch?v=YweLrqGU4Wc

https://www.youtube.com/watch?v=d8JrLrhD9bE

Both videos are of the octo with default settings except for tilt rate D at 25600.

Larry

Hi all,

A month later, slightly better news

I've now tried mounting the AQ on the four M3 rubber damper I mentioned earlier, and the 'zing zing' noise has gone! I was able to hold a very stable hover in my small garden in slightly windy conditions. Also the platform didn't have its tendency of wanting to fly in a particular direction as it used to do here:

viewtopic.php?f=36&t=3542

Strangely, the vibration level is the same, if not worse than before, see attached.

Interestingly, I've just spotted the 'zinging' noise in the MOT plots from my flights back in July – it's clearly visible as very sharp individual spikes. These spikes are *not* visible in the MOT plots from today's flight, but the MOT data is a lot more noisy.

I don't really know what to make of this – in one respect it's better, and in the other respect it's worse!

I will experiment making the mounts softer still and report back ... can't promise it will be immediately though

Many thanks for any and all advice,

David