[hawkman]

Sounds like:

Your tail rotor pitch is not set properly.

To set this up you must understand this...when a heli is on the grond with rotor spinning...there is 'torque' ie the rotor and heli want to spin opposite ways...the tail rotor has to have some pitch to counter this...ON THE GROUND....so the servo arm should be 90 degrees to the servo body....and the tail pitch will be say 5 degrees or so....the TRAILING EDGES of the blades should point RIGHT (this is with you behind the heli looking forwards) you will need to sort this out mechanically.

Once adjustment is made:

make sure the gyro is in heading hold first...then switch to rate...so heading hold OFF.

Go hover...and watch the tail....if the tail goes left or right on its own...land and MECHANICALLY adjust the linkage....so if the tail goes left you need to reduce the nuetral pitch...hover and test...you want it so the heli holds its tail straight.

If its breezy: make sure the heli hovers pointing into the breeze...watch the tail...if it stays still then the adjustment is good.

A badly set tail in heading hold mode will not hold...thats why the nuetral point has to be spot on.

Its a good idea to use some kind of training base while making gyro adjustments...or any kind of test flight...I use a hoop and sticks...fastened to the skids its ideal.

Rob