Hi Guys,

I have a Zoom Heading hold gyro (same as the Align one) But i have trouble getting it to hold its heading. Its definantly in HH Mode as when i move the stick it doesnt go straight back to center. It seeks slowly to center...

But after setting it up with the arm at 90 and the servo centered with the blades at 0 pitch, Switch it into HH Mode, try to take off and it slowly keeps turning one way... I have managed to get it to almost hold in one direction but i cheated by sliding the servo up and down the boom untill it was as close as i could get it....

Any ideas on how i can get this sorted?? Its rather annoying having it turn itself... I'm tempted to go buy a 401 but my wallet isnt looking good right at the moment.

Also i have noticed with the slider on the tail pitch, that if you slide it all the way back to the boom the blades have HEAPS of pitch. but if i slide it all the way towards the blades they have not as much pitch. And i think this is the direction it needs more pitch! (to counter the rotor's) Or is this how its supposed to be?

Cheers,

Make sure you're starting with trims and sub trims (if you have them) on your TX all centred. Next use the trim on the TX to stop the rotation. It should lock in one place. Also ensure that any revo mixing is off.


HH mode relies on both the TX and gyro agreeing on what "centre" is, normally a 1.51ms pulse width. If this is marginally off, in either TX or gyro, then the gyro will interpret it as a command to turn.

Adjusting the servo position on the boom will make no difference to HH mode, it'll only make the servo run offset from it's centre position.

Karyn

Ahh thansk for that. I thought adjusting the trims on the transmitter would be bad for some reason..

But yeah, what do you think about the slider on the tail? should it be in dead centre and have 0 pitch? because mine is more to one side at 0 pitch.

The tail pitch for hover will not be zero as it has to push against the main rotor torque. The precise TR pitch will depend on the head speed you're using, but in general you should find that if the heli designer did his math correctly the slider will be about centre at hover.