Narrative:

We briefed a student sortie; tailwheel transition; in a citabria at ZZZ airport. Preflight and taxi were normal. We were cleared for takeoff and began the takeoff roll. At the beginning of the roll; I noticed the student was applying light brake pressure as he was moving the rudders; and I reminded him to use only the rudders. At approximately 30-40 mph; I prompted him to raise the tailwheel. He moved the stick slightly forward only; and I prompted him again. As I prompted him the third time; I began to push the stick forward; but it did not move. At this point; the stick was about halfway between neutral and full aft.about this time; we began to drift to the right side of the runway. I called out; 'my flight controls' and tried to move the plane back to centerline; but could not move the stick forward or laterally. After a couple seconds; the student relinquished control and I applied left aileron and rudder. I got the plane on the left wheel; and attempted to continue left back to centerline; and attempted to get airborne. As we lifted off; I heard the aft end of the plane strike something.I continued the takeoff; and told tower that we had probably struck a runway light. I continued straight out; tower asked my intentions. I asked for the winds. I landed on the main wheels; and touched the tailwheel lightly to the ground and back up; to verify the tailwheel was undamaged and would roll properly; it did. I put the tailwheel back down; it rolled normally; I turned off on [the] taxiway and taxied to the maintenance facility.I notified the flying club management; the aircraft owner; and the maintenance facility.

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Original NASA ASRS Text

Title: Citabria flight instructor and trainee reported difficulty maintaining control during the takeoff roll.

Narrative: We briefed a student sortie; Tailwheel transition; in a Citabria at ZZZ Airport. Preflight and taxi were normal. We were cleared for takeoff and began the takeoff roll. At the beginning of the roll; I noticed the student was applying light brake pressure as he was moving the rudders; and I reminded him to use only the rudders. At approximately 30-40 mph; I prompted him to raise the Tailwheel. He moved the stick slightly forward only; and I prompted him again. As I prompted him the third time; I began to push the stick forward; but it did not move. At this point; the stick was about halfway between neutral and full aft.About this time; we began to drift to the right side of the runway. I called out; 'my flight controls' and tried to move the plane back to centerline; but could not move the stick forward or laterally. After a couple seconds; the student relinquished control and I applied left aileron and rudder. I got the plane on the left wheel; and attempted to continue left back to centerline; and attempted to get airborne. As we lifted off; I heard the aft end of the plane strike something.I continued the takeoff; and told tower that we had probably struck a runway light. I continued straight out; tower asked my intentions. I asked for the winds. I landed on the main wheels; and touched the Tailwheel lightly to the ground and back up; to verify the Tailwheel was undamaged and would roll properly; it did. I put the Tailwheel back down; it rolled normally; I turned off on [the] taxiway and taxied to the maintenance facility.I notified the flying club management; the aircraft owner; and the maintenance facility.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.