Everything has been working fine but all off a sudden when flying around or hovering I get slight flutter every now and then I can only describe it like my motors sped up or slow down for a very brief period.
Any ideas please.

hi, Simon, could you pls upload a video, so that the others can better understand.

Next time out flying I'll try to film it.

It's got me thinking it sounds just like a buzzing bumble bee flying around with the hiccups.

Adjust the altitude gains properly

Hi,

Sorry, if i hijack your thread ;-)

But yesterday  i was out flying  with a friend, he´s got a F550 with a Nasa-M V2, it has been flying flawless, but then it started to flutter, i recorded a video, you can see the flutter around 15 and 20 sec. in.
Sadly i didn´t record the crash that happened 20 minutes later, it startet to flutter and went down fluttering all the way.

We took the bird down, just after the video, and did the compass and imo calibratio, took it back up and then ....... it was a soft crash though !

Link to Video

Best

Jan Jeppesen