ORIGINAL: pedec
I would like everbody to know this is my first heli and need some help. Just bought a used t-rex 450 seems in really good shape. I am using a rd 6000 transmiter and reciever. Hooked everything up and seems to work well but tail rotor will not center when I let the rudder stick go, is this normal with a gyro hooked up. If I move heli side to side I can see rotors move really smooth and slow i believe because gyro is working proper. But when I try to use rudder stick it will not center if I drop stick. Any help would be great.
What gyro do you have?? What mode are you in??
Some gyros have two modes of operation: Normal/Rate mode and Heading Hold.
In Normal/Rate mode, the rudder stick controls the servo mostly and the gyro mixes in very little.
In Heading Hold (HH) however it's a different story. In HH, the stick position DOES NOT position the tail rotor servo. It is essentailly a YAW rate control to the gyro and the gyro moves the servo as required to cause the heli to YAW at the rate commanded by the rudder stick position.
When your heli is not flying (on the ground/ on your workbench), it can't YAW. So when you move the stick (command a YAW rate), the gyro moves the servo as required to achieve that YAW rate (which the heli doesn't) ... so the gyro keeps adding pitch until it either moves the heli (which it won't) or the gyro reaches the stops ... and there it sits. While in the air, the heli is capable of responding to the t/r pitch change and the gyro/servo response works normally.
Usually wiggling the rudder stick will give the gyro a "new" rate or wiggling the heli will cause it to recenter.
So if you have a normal acting gyro and a correctly setup heli and TX and you are in HH mode ... this is a typical response.