General 450 wobble

[Andydrew1964]

Hey guys , I have started to get a wobble , so I changed and replaced everything including the head , feathering shaft and main shaft as I assumed it was mechanical , ie something bent or worn , However when I test flew it the wobble was still there ? It baffled me and I had to leave it for a couple of days , this morning I tried again and the wobble was still there , finally I decided to lower the head spead as I had raised it prior to having the wobble but didn't make the connection ? It's flying great now but does anyone have any ideas as there surely is something wrong and how can I raise my head spead if it's going to shake and wobble ???

 

[Tony]

What helicopter/gyro/Tx are you using? If this is a flybarless heli, then you need to lower your gains.

 

[Andydrew1964]

Ok tony , it's a Trex 450 with 3gx and align t6 tx , thanks dude

 

[Tony]

Is this an aileron or elevator shake? Answering that one will tell you what pot on the gyro to adjust. I would hook it up to the computer and make sure both pots are set to about 105. I will bet you will find one of them is about 120 or so.

 

[Andydrew1964]

It's a 3gx MR tony , u can't hook it up to the computer ?

 

[Tony]

Ah, in that case, I would just lower the Gain pot slightly (like a half hour) and try it again. If you are comfortable with idle up, do this testing at 100% throttle so that you can dial out the wag throughout the whole throttle curve.

 

[Andydrew1964]

Ok tony I will do just that and try it again in the morning , thanks again bro , I will let u no how it goes !

- - - Updated - - -

And am I right in assuming I should be lifting off in normal mode and then switching to idle up for flying ? And then landing in normal mode ?

 

[Tony]

That is correct. Any time you are on the ground, you should have the lowest possible head speed.

 

[Andydrew1964]

Great , so 1 last thing Tony , do I switch back to normal mode before doing an auto ?

 

[Tony]

An auto can be done in any flight mode since it kills the throttle. Just remember what position you were in before you flip that switch to take off again.

 

[Lee]

It will depend on the pitch curve you have in normal mode.
autos need about -6º to work, but most people only have -1º or -2º set in normal.