Start your roll out while slowly applying thrust, and hold tail down with the ele. As your ground speed picks up control the direction with the rudder when the ground roll is getting faster start to release the ele. until the tail comes off the ground. once the air flow is fast enough over the tail it will track straight. until that point you will need to slowly raise the speed while controlling direction with rudder. My 1/4 scale fly baby will spin on the ground if I punch the throttle.