Narrative:

This was a practice wheel landing for an ATP-rated pilot who was in tailwheel transition. This was our fourth pattern. He flew a normal approach to a wheel landing; controlled touchdown on centerline and rollout on runway 17R. At about 30-40 mph and while stabilized on runway centerline; he lowered the tail to the ground; and the aircraft immediately swerved right for an unknown reason. As we corrected back to the left; the aircraft swerved left. We were unable to stop the left swerve; and the aircraft departed the runway. We added power; stabilized on a heading of about 170 degrees in the grass; returned to the runway; and initiated the go around.as we got airborne; I asked tower for the winds; they replied 360 at 10 knots. (This was our fourth pattern; winds to that point had been about 040 at 4 knots; I was unaware that the tailwinds had increased to ten knots direct tailwind.) after telling us the winds; tower informed us they were going to turn the airport around. We held southwest of the pattern until the runway change was complete; then landed full stop on 35R.on post flight; we noticed a small scrape on the aft side of the right wing tip (about 2 inches; mostly paint); which I assume would have occurred during the left swerve. I notified the chief pilot; who met us at the airplane to assist in post flight. We debriefed as a crew; then I debriefed with the chief pilot individually.

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Original NASA ASRS Text

Title: A tailwheel Flight Instructor reported losing control on landing; running off the runway and subsequently going around with a damaged wing.

Narrative: This was a practice wheel landing for an ATP-rated pilot who was in tailwheel transition. This was our fourth pattern. He flew a normal approach to a wheel landing; controlled touchdown on centerline and rollout on runway 17R. At about 30-40 mph and while stabilized on runway centerline; he lowered the tail to the ground; and the aircraft immediately swerved right for an unknown reason. As we corrected back to the left; the aircraft swerved left. We were unable to stop the left swerve; and the aircraft departed the runway. We added power; stabilized on a heading of about 170 degrees in the grass; returned to the runway; and initiated the go around.As we got airborne; I asked tower for the winds; they replied 360 at 10 knots. (This was our fourth pattern; winds to that point had been about 040 at 4 knots; I was unaware that the tailwinds had increased to ten knots direct tailwind.) After telling us the winds; tower informed us they were going to turn the airport around. We held southwest of the pattern until the runway change was complete; then landed full stop on 35R.On post flight; we noticed a small scrape on the aft side of the right wing tip (about 2 inches; mostly paint); which I assume would have occurred during the left swerve. I notified the Chief Pilot; who met us at the airplane to assist in post flight. We debriefed as a crew; then I debriefed with the Chief Pilot individually.

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.