Hi,

I have Trex 600 with GY401/9252 with Futaba 6EXH for Heli.


Q1) I can't seem to find End point adjustment for the Rudder. I used the EPA settings for every other servos or max range of swing, but the rudder, only effect it has is the speed of the servo movement, not the range. I need to set the range so it won't bind at full push.

Q2) When it's up and hovering, it drifts counter clock wise slowly. The length of the tail cable and the settings are right, but it likes to drift. It's in AVCS and no matter what gain I get set, it just likes to drift.

Please help if you're Trex expert or Heli for that matter.

Thanks in advance.

you adjust the limit pot on the gyro itself.

did you adjust the end points for channel 4 as well? I am still tuning in my 600. i can go thru my settings if you need them. all i ihave left to do is throttle/pitch curves. had quite a bit of servo buzzing to deal with.

Adjust the end points to 100/100 and set the total servo throw in RATE mode with the limit pot on the gyro.

After that the end points control your piro rate, not servo throw.

Also the linkage length is just a guide line. If you adjust the linkage so that there is no or little drift in rate mode then heading hold will probably hold just fine.

Make sure you in heading hold mode (solid light)
Also make sure you dont have different rudder trim in different flight modes, any rudder trim will cause the gyro to drift, on the ground flip the flight mode switch and watch the light (engine off) and make sure it stays on solid.

Thank you Fitz21 & BarracudaHockey!!

I was able to change the limit, but it touches the hub at full right even with at lowest limit and the servo buzzes. Although, the other way, left has room left. Does this means that I have to adjust the cable to make the tail pully be more away from the hub when the tail servo is at 90 degree initialized? If I do that, would I not lose that 15 degree initialization?

Don't know.... help

If its hitting at the lowest limit your servo arm is too long.

Thanks!!