I bought a parkzone su-26xp last week.

I've binded it to my dx6i and am using the recommended 'Normal' settings for DR and expo. When carrying out preflight checks I noticed the rudder is binding. It fails to return to center after input and stays around 2 or 3 degrees short of straight. I can straighten it out with a little opposite input but that's no good once it's in the air. It also suffers from servo chatter as soon as the flight pack is connected. Are they all like this?