Mr Smiley,

I do not have the Creata 400 but I think I know what's up. My Walkera 180Z has a gyro and I believe yours does too. This causes the tail to stay as you directed it until you center it. If you fire it up, less motor, move the rudder stick, and then turn the heli around, you should see the servo react. It will be trying to hold the same heading as originaly input by you. Give it a try.

Good LuckJeff