RE: GP Extra 300S 60 Build 2013
In my experience, pull-pull for rudder is the way to go. In regards to elevator halves using two separate channels (one master and one slave), I have found that it works best with a radio with adjustable delay in the channels. If not, the master servo will be moving faster that the slave that possibly cause some roll torque. For that reason, I have changed my models to D.E.P.S (Dual Elevator Pushrod System) as used by pattern models.
my 0.02.
Pedro