ORIGINAL: mitchell170
Did you use trim to straighten out the roll on the ground?
If you did, then you've essentially trimmed in some yaw in the rudder in order to get the nosewheel straight. Rather than using trim to adjust the nosewheel for a straight takeoff run or roll out on landing you should use the nose wheel linkage to adjust for straight roll. This leaves the rudder trimmed properly so you don't see a sudden yaw as the rudder gains effectiveness either while still on the ground or just at take off.
My rudder/nose gear servo has a "slide through" type linkage at the servo for the nose gear pushrod. That allows me to loosen the set screw and move the pushrod forward or backward to straighten the nose wheel, while not affecting the rudder at all.
Bob
Nope, did as you said, adjusted all with either the set screw or the linkage on the servo horn (one of those slide through setups) so the rudder would stay as trimmed for flight. My instructor saw me and saw it happened, and noticed the wind, and said my plane was 'weathervaning' (that's the term, now I remember!). But yeah, as soon as the front wheel left the ground, the plane would turn right into the wind. Fun stuff.