From this article http://www.kitplanes.com/issues/27_12/flight_reports/Flight_Review_Christen_Eagle_9393-1.html . "takeoffs are easy from grass or hard runways. Line up straight, add a bit of into-wind aileron, softly squeeze the right rudder, gently open the throttle"
Though it also states that alot of rudder is needed during most flight regimes, which is not implemented yet in the beta. The slip ball stays centered most of the time now.