Rv-8 pilot reported a loss of directional control and runway excursion due to a gust of wind.

Narrative:

After a normal visual approach and touchdown on runway; my aircraft departed the paved runway surface on the right side of the runway. This departure from the runway paved surface was caused by a gust of wind that overpowered the rv-8 (tail dragger) rudder and tailwheel which did not have sufficient steering authority to keep the aircraft moving in a straight line down the runway. I used full rudder and full wheel braking to try to stay on the runway; but it quickly became apparent that I could not maintain directional control and the airplane left the pavement at approximately 20 knots ground speed.I brought the aircraft to a stop and shut down the engine between runway 3 and taxiway a; about halfway between the runway approach end and taxiway A8. There was no damage to the airplane and I sustained no injuries. Airport personnel assisted in moving the aircraft back to my hangar. I telephoned the tower to inform them that the aircraft was not damaged and that there were no injuries.immediately after the incident; I thought the cause had to be a tailwheel malfunction. I spoke with the tower controller on the phone and told him that I thought it was a tailwheel problem. However; after getting the airplane back to my hangar; I carefully inspected the tailwheel and found it to be operating normally.upon further consideration; I believe that contributing factors in this incident were the wind; and my initial surprise at the gust since no gust factor was reported on ATIS or by tower. Another contributing factor was my inattention and complacence as I assumed that the landing weather conditions would be just like every other time I landed at ZZZ. In hindsight; I might have recognized the dangerous situation earlier on landing rollout and executed a go-around; since there was plenty of runway surface remaining for a go-around.

Original NASA ASRS Text

Title: RV-8 pilot reported a loss of directional control and runway excursion due to a gust of wind.

Narrative: After a normal visual approach and touchdown on runway; my aircraft departed the paved runway surface on the right side of the runway. This departure from the runway paved surface was caused by a gust of wind that overpowered the RV-8 (tail dragger) rudder and tailwheel which did not have sufficient steering authority to keep the aircraft moving in a straight line down the runway. I used full rudder and full wheel braking to try to stay on the runway; but it quickly became apparent that I could not maintain directional control and the airplane left the pavement at approximately 20 knots ground speed.I brought the aircraft to a stop and shut down the engine between Runway 3 and Taxiway A; about halfway between the runway approach end and Taxiway A8. There was no damage to the airplane and I sustained no injuries. Airport personnel assisted in moving the aircraft back to my hangar. I telephoned the Tower to inform them that the aircraft was not damaged and that there were no injuries.Immediately after the incident; I thought the cause had to be a tailwheel malfunction. I spoke with the Tower controller on the phone and told him that I thought it was a tailwheel problem. However; after getting the airplane back to my hangar; I carefully inspected the tailwheel and found it to be operating normally.Upon further consideration; I believe that contributing factors in this incident were the wind; and my initial surprise at the gust since no gust factor was reported on ATIS or by tower. Another contributing factor was my inattention and complacence as I assumed that the landing weather conditions would be just like every other time I landed at ZZZ. In hindsight; I might have recognized the dangerous situation earlier on landing rollout and executed a go-around; since there was plenty of runway surface remaining for a go-around.

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.

Attributes
ACN	1446840
Time
Date	201705
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	RV-8
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	None
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 300 Flight Crew Total 12500 Flight Crew Type 705
Events
Anomaly	Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway