Hi,

On my tail draggers, I found that 40% expo on the rudder allowed a good transition between "wheel on the ground" and the low speed where the tail wheel is off the ground before the plane breaks ground. Also, if the tail is held on the ground until the takeoff roll is at least 25 ft and the plane has some ground speed, the yaw to the left for the remaining portion of the takeoff roll is minimized. Most of my "work stuff" have lifting airfoils on the horz stab and the tail comes off the ground very quickly. This make the whole problem of a straight takeoff roll a bit more difficult because the tail is flying at low ground speed and the rudder is not that effective until you gain some speed.

hope this helps

Elson