Heading Hold Help

[callum]

Hey All,

I need help setting up my Gulang G680 Heading Hold Gyro on my Belt CP,

The Gyro itself doesnt have a limit nor gain knob, so i presume the gain itself is set from the Tx,

Right here is the problem,

Rate Mode seems to work fine,

But when i enable HH Mode the servo horn slowly starts to move full right,

ive tried most things, and im tearing my hair out lol.

Ive messed around with gains, the Gyro Sens menu, the Travel adjustments, ect

also the rudder over-moves causing binding, but ive solved that via Travel Adjustments,

also, ive noticed if i use sub trim to move it, back as soon as hits center it then moves slowly full left

Im not sure if this is part of Heading Hold, but my Belt CP is grounded until the gyro is setup, or until Rate Mode gain is correctly adjusted,

[callum]

Sorted Learnt something new, that its called servo drift in Heading Hold

Followed this Little Guide and it now works, though i turned my Tx off and it lost all the settings :S




Hi. Your setting your gyro up in the wrong sequence, it`s Headlock first then Rate mode, but personally I`d set it to Headlock mode and leave the Rate mode alone.
Heres what I would do assuming you have your servo and gyro directions correct to start with
Disconnect the tail linkage from the servo
Zero rudder trim and sub trim.
Set rudder ATV to 100%
Set the gain channel to give 50%. ( depending on the TX this can actually be a value of 50 on the display for both switch positions or depending on the set up 25 for one switch position and 75 for the other. A value of 50 in this second type of set up is null neither Rate nor HL)
Use a 4.8v pack to power the RX or unmesh the motor
Switch on the RX.
Select the switch position that gives Rate mode ( one position will leave the servo more or less where you put it and is HL mode, the other will allow the servo to come back to neutral when you let go of the stick and is Rate mode. )
Let it all settle for two or three minutes.
Flick into HL mode and then go into rudder sub trim and adjust as appropriate to get the minimum drift.
Flick into rate mode to find servo centre again and leave it there for the time being.
Adjust the arm to get as close to the 90 degree position as possible. This can only be done by moving the arm on its splines or adjusting the internal pot. ( Not recommended if you are heavy handed
Adjust the servo position on the boom and/or linkage rod to give zero pitch on the tailblades
Now using the TX, move the servo to it`s extremes both ways and select a hole position on the arm which does not allow the linkage to bind up at either end of these extremes.
Once you have this position reduce the rudder ATV to about 65%, recheck your gain value and test hover.
The gyro will send the servo to the correct hovering position and you will still have full servo deflection in both directions.
Adjust the rudder sub trim to eliminate any drift one way or the other, and the heli stays put. You may need a click or two on the external trim every now and then because this type of gyro is renowned for drifting due to internal and external temperature changes unless it has drift cancellation built in, and this can be variable.
Aim to set the gain to lock the tail without any wag. The gain may well need to be a lower value when you go into FFF. If your TX supports it, select the gain rates from the Flight Mode switch ie Normal, Idle up1 etc.
Pirouette rate is determined by the Rudder ATV so increase it slowly until you get the rate you want without any bounce from the stops although it`s probably never going to be brilliant
This should get you going.

For what it`s worth:
Forget about using both modes together with this type of gyro because its a pain and the end result is not worth it This is because you cannot set the end stops of the servo travel independently, and so the initial tail rotor offset required to get the heli to hover in rate mode gives unequal travel to the pitch slider. You then end up with a heli that will spin one way and not the other or more likely has a very sluggish pirouette rate which is not good.

Hope this helps

[Mojogoes]

Hey All,

I need help setting up my Gulang G680 Heading Hold Gyro on my Belt CP,

The Gyro itself doesnt have a limit nor gain knob, so i presume the gain itself is set from the Tx,

Right here is the problem,

Rate Mode seems to work fine,

But when i enable HH Mode the servo horn slowly starts to move full right,

ive tried most things, and im tearing my hair out lol.

Ive messed around with gains, the Gyro Sens menu, the Travel adjustments, ect

also the rudder over-moves causing binding, but ive solved that via Travel Adjustments,

also, ive noticed if i use sub trim to move it, back as soon as hits center it then moves slowly full left

Im not sure if this is part of Heading Hold, but my Belt CP is grounded until the gyro is setup, or until Rate Mode gain is correctly adjusted,

When you switched over to heading hold did you switch the heli off then on again plus if it moves again in hh after that then switch off and on again..............if you've adjusted it in rate mode so it doesn't turn to the left or to the right when you spin it up to a good headspeed plus have the horn at 90 degree's then it should centralise ok in HH.

Forget what i've put as i've now seen that you have sorted it out.