GY401 holding, but heading slightly nose right

[dogfart]

My GY401 holds fine, but the heading is slightly nose right. It is on my Trex600E. Any suggestions would be appreciated.

[DavidH]

If it is holding fine. Give it a little left rudder and move the nose left.

David

[dogfart]

If it is holding fine. Give it a little left rudder and move the nose left.

David


I'd like to avoid constant stick input if poss. I am trying some left rudder trim, but can't get it perfect.

[DavidH]

I'd like to avoid constant stick input if poss. I am trying some left rudder trim, but can't get it perfect.

Well you said the gyro was holding fine. Now I guess your saying it is drifting to the right. From the holding fine statement. That is why I said to give it some left rudder and straighten it up.
You don't say what transmitter your using. But from what your say, I would think the pot on the rudder channel is worn and not going back to center. That can cause HH gyros to drift, because it is constantly getting a rudder input from being not centered.

David

[dogfart]

Well you said the gyro was holding fine. Now I guess your saying it is drifting to the right. From the holding fine statement. That is why I said to give it some left rudder and straighten it up.
You don't say what transmitter your using. But from what your say, I would think the pot on the rudder channel is worn and not going back to center. That can cause HH gyros to drift, because it is constantly getting a rudder input from being not centered.

David


Thanks for your additional thoughts. I am using a DX7 that does not have a lot of time on it, but I suppose that could still be the problem. If it were, then would the light on the gyro blink?

[istandalone]

the light will blink if it's getting rudder input, be it from you moving the sticks or the pot being not centered. i don't believe the gyro can tell the difference either way.

[dogfart]

the light will blink if it's getting rudder input, be it from you moving the sticks or the pot being not centered. i don't believe the gyro can tell the difference either way.


I'll have to check that out once I get back flying. (I landed to do a trim adjustment but stupidly left the blades spinning at close to 50% collective and my thumbs on the sticks. Well, I managed to run the main and tail blades into the ground. The tail blades folded and weren't damaged. One main blade broke and I stripped the main gear and needed to order a replacement. (I thought I had a couple of spares, but didn't.))

[dogfart]

Well you said the gyro was holding fine. Now I guess your saying it is drifting to the right. From the holding fine statement. That is why I said to give it some left rudder and straighten it up.
You don't say what transmitter your using. But from what your say, I would think the pot on the rudder channel is worn and not going back to center. That can cause HH gyros to drift, because it is constantly getting a rudder input from being not centered.

David

I don't know that it is drifting. With no trim, the heli holds slightly nose right, and I can't seem to apply the proper amount of left rudder to get the nose perfectly straight. (I can get it to stop holding right, but then it holds left.)

[Scott Graham]

i know what it is.. my raptor did this. its the temp. if you dont let your gyro adjust to the same temp as where you flying it can cause the gyro to drift. like if you keep your heli in the shade and then take it out to the sun and fly the gyro will start to drift. let the heli regulate its temp for about 5 min before you turn it on to avoid this. =] i think its this if you say it drifts a little to the right slowly and needs to be corrected every few minutes to keep it straight

[Vulcan Grey]

Are you trimming while the gyro is in heading hold (AVCS) mode?
It sounds like you are, since you didn't mention switching back to Rate mode.

This is what the GY401 manual says
Do not operate the rudder trimmer while
flying in the AVCS mode.

When the power is turned on, the GY401 assumes that
the rudder stick is in the neutral position. If the rudder
trimmer is moved during flight, the neutral position will
change.



Also this

•Rudder neutral signal memorization methods
[Method 1] When the gyro power is turned on, the transmitter rudder signal
automatically received at that time is assumed to be the neutral signal and
is memorized. The gyro is normally used in this state.
[Method 2] Rapidly switch the transmitter sensitivity switch between the
AVCS and normal modes at least 3 times at a 1 second or shorter internal,
then set the switch to the AVCS mode position. The monitor LED flashes
instantaneously and the rudder signal is memorized. If the trimmer was
moved during flight, the memorized neutral position can be updated to the
current neutral position by repeating this operation. When performing this
operation, land the model and hold the rudder stick in the neutral position.
•Rudder neutral check method
In the AVCS mode, the servo does not return to the neutral position even
when the rudder stick is returned to the neutral position. When you want to
check the servo neutral position during linkage neutral check, etc., select
the normal mode, or remain in the AVCS mode, and move the rudder stick
left and right at least 3 times at an interval of 1 second or less, then immediately
return the stick to the neutral position. This operation returns the
rudder servo to the neutral position.