View Full Version : Tail Servo Walking
dutchmen94
06-26-2008, 05:11 PM
Perhaps someone can help me out. I have a Trex 450 SE V2 with a Futaba 401 gyro and a digital servo. The tail servo will move by itself to one side or the other, sometimes it will not return to netural when I center the stick. I haven't moved or readjusted anything and I haven't crashed it either. What could be the problem? It's scary to hovering and touch the control to straighten the nose out a little and have it go into a sipn that I can not correct.
thanks Bob
Tintin
06-27-2008, 04:52 AM
Before you take off, do you have a steady light on the gyro?
If so, you are in HH and it's normal that the servo does not return.
If it goes into an uncontrollable fast spin (several turns per sec) I'm pretty sure your gyro needs to be reversed (or taken out of reverse if already set to that.
Are you sure your tailblades are on correct and the tailrotor spinning in the right direction?
If it just turns once per sec and you might just need to adjust gain.
What is your gain set at now?
dutchmen94
06-30-2008, 05:12 PM
Before you take off, do you have a steady light on the gyro?
If so, you are in HH and it's normal that the servo does not return.
If it goes into an uncontrollable fast spin (several turns per sec) I'm pretty sure your gyro needs to be reversed (or taken out of reverse if already set to that.
Are you sure your tailblades are on correct and the tailrotor spinning in the right direction?
If it just turns once per sec and you might just need to adjust gain.
What is your gain set at now?
Thanks for getting back to me. The light is on steady. What is "HH"? I haven't changed anything, I have been flying it with no problems. This just started happening. It will do it on the bench without the main blades or tail blades turning. The tail blades will walk to left or right or they just won't return to center.
Thanks again Bob
BlackTitanium
07-02-2008, 01:20 PM
The manual that came with your gyro... read it.
"HH" means Heading Hold.
It is normal for the servo to walk, when in heading hold mode.
Simply move your rudder stick right to left, 3 times, then back to center stick, and your servo will reset to center.
Please watch Finless Bob's video on the gyro setup:
http://www.helifreak.com/showthread.php?t=11373