Narrative:

I was on take-off roll; the tailwheel unlocked and the aircraft drifted towards the left edge of the runway. I added full power which caused more left turning and it went off into the grass striking a runway identifier sign. The airplane became airborne and I flew it to the destination after observing that it was flying normally. The sign was destroyed but there was no damage to the airplane. Later I determined that the tire hit the sign and missed everything else on the airplane. The tailwheel was repaired to keep from unlocking and causing this situation again.

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Original NASA ASRS Text

Title: P-40 pilot reported a loss of directional control on takeoff roll that resulted in a runway excursion and contact with a runway identifier sign.

Narrative: I was on take-off roll; the tailwheel unlocked and the aircraft drifted towards the left edge of the runway. I added full power which caused more left turning and it went off into the grass striking a runway identifier sign. The airplane became airborne and I flew it to the destination after observing that it was flying normally. The sign was destroyed but there was no damage to the airplane. Later I determined that the tire hit the sign and missed everything else on the airplane. The tailwheel was repaired to keep from unlocking and causing this situation again.

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.