I have a new 40% comp -arf extra 330.the rudder wags back and forth ,during flight .what is the best cure ?I had a piece of square material on the rudde trailing edge ,it helps a little ,but you can still see a little wobble.[sm=confused.gif]

Dave,

Make sure your pull-pull cables are tight enough. They don't have to be super tight but they should not have slack in them when the rudder is at neutral.

I usually take a piece of plastic 3/16" 90 degree angle and glue it on the trailing edge of the rudder in the shape of a V.

The only other thing I can think of is if your servos have slop in them, most metal gears do. So you may get a a very little play from that but it should not effet flight because once the air is blowing over the rudder, it will put tension on the cables.

That's all I can think of.
I'm also assuming that all servos and trays are mounted securely and that all the linkages do not have any slop in them.

Barry Finck
Enola,PA

got a photo ?thanks,everything is tight nand solid,but the plastic oiece on the rudder may not be wide enough

Some guys also have found the air balancer to be too large. A few guys I know have cut a piece of the air balancer off and then attached it to the verticle stab, thus making the air balancer smaller and the verticle stab larger. It seemed to make a big difference according to the pilot. If I'm not mistaken, the Super Extra has a smaller air balancer that the 3.0 Extra.

SWB makes a offset servo arm that will fix the problem
Just tell them you have the Comp-arf 3.0 he will know
what you need. Here is the link
http://www.swbmfg.com/ and look under the Offset servo arm