Gyros exhibit bias drift. It's a nature of their design and a limitation that can not be corrected for without accelerometers.
Don't expect solid stabilization with RC helicopter tail gyros. They will stabilize but only marginally well. A better solution is an IMU or AHRS sensor package. The good news is we hope to be testing one within a month.
In the mean time, be sure you have your trim step value on your TX set all the way down to '1'. This will offer finer resolution of trim adjustment.
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DJ Vegh
PhotoShip One
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