Hexacopter C of G position

[pheasant_plucker]

I have just completed some test hovers on my Argonaut 370mm Hex
I have initially set the C of G over the centre of the APM but the copter requires a good heap of back stick to remain in a steady hover. Without the back stick it tries to fly forward.
i am presuming because of the layout of this Hex that the C of G is the culprit and it needs to go back. Anyone with experience of the effect a wayward C of G can have on a copter?

Gerry

[Crob203]

The centre of gravity measurement location is dependant on not the measured position (distance) along the frame but where the centre of thrust is. On that frame it looks like the majority of the thrust is rearward of the frame so the centre of thrust will be further back.

How adjustable is your battery position, try moving it back incrementally until you get a steady hover. Main issue with your setup now, is that by tuning out the back cofg, you will lose a heap of top end thrust!

Chris

[pheasant_plucker]

there is lots of adjustment possible with the battery position. I';ll try to move it around and tune the hover like that.

Gerry