Following a perfect wheel landing; the pilot of a 8KCAB decathlon lost control and groundlooped.

Narrative:

I came in on short final and slipped it in. I made a perfect wheel landing on runway xx. On the rollout; I put the tail down. The minute it touched down; the plane started turning in a wide circle to the right. I had slight aileron to the right and stick full back. I released some of the pressure on the back stick to see if I could get control; but I had no control. I applied full left rudder; but it seemed like the tailwheel had locked into position keeping the plane in a circular right turn to the exit ramp. It came around to the right after it had turned almost 240 degrees to 260 degrees; the left wing came down and hit the pavement and turned into the wind facing runway 15. The wing came up. I then taxied back to my hangar and shut down. There was not that much wind. It felt like centrifugal force had put the wing down. It happened off the runway on the exit ramp.

Original NASA ASRS Text

Title: Following a perfect wheel landing; the pilot of a 8KCAB Decathlon lost control and groundlooped.

Narrative: I came in on short final and slipped it in. I made a perfect wheel landing on Runway XX. On the rollout; I put the tail down. The minute it touched down; the plane started turning in a wide circle to the right. I had slight aileron to the right and stick full back. I released some of the pressure on the back stick to see if I could get control; but I had no control. I applied full left rudder; but it seemed like the tailwheel had locked into position keeping the plane in a circular right turn to the exit ramp. It came around to the right after it had turned almost 240 degrees to 260 degrees; the left wing came down and hit the pavement and turned into the wind facing Runway 15. The wing came up. I then taxied back to my hangar and shut down. There was not that much wind. It felt like centrifugal force had put the wing down. It happened off the runway on the exit ramp.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	832630
Time
Date	200904
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Decathlon 8KCAB
Operating Under FAR Part	Part 91
Flight Phase	Landing
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private Flight Crew Instrument Flight Crew Student Flight Crew Commercial
Experience	Flight Crew Last 90 Days 44 Flight Crew Total 8000 Flight Crew Type 2000
Events
Anomaly	Ground Event / Encounter Loss Of Aircraft Control