450 Trex 450 WOBBLES

[billryalls]

Had a rough landing and replaced main shaft, boom and main gear. All else seem perfect. Problem is I now have a horrible shake at any rpm ABOVE hovering. Rock solid hovering and turning while hovering but as soon as I give a bit more throttle the wobbles begin and I'm not talking about tail wag. This is a nose to tail wobble. My heli is the a Trex 450 Pro 3GX FBL

 

[Tony]

You didn't mention replacing or checking your feathering shaft. Watch the video below and check yours. Even the slightest bend in that shaft will cause massive vibrations.

 

[billryalls]

I tested the feathering shaft and it was good. Went out and decided to play with the settings (dials) on the 3GS unit itself and glad i did. I first turned the ELEV dial to the right and things got worse. Turned it slighty left (45%) and it got a little better Turned it half way to the left (25%) and it was MUCH better but still just a slight wag now. I went to the other dial and turned it left to 30% and bingo! I now have a VERY stable Heli and it even hold with HARD throttle! Dont know what I just did but it sure worked lol

 

[Tony]

If this is on the 3GX, you adjusted your cyclic gains. right is more, left is less.

 

[billryalls]

It was on the 3GX and it's a trick I won't forget haha.