The pilot of the tailwheel-equipped airplane reported that during the landing roll as he pulled the power to idle and lowered the tail, he raised the flaps and the airplane encountered a "sudden and strong wind" that caused the airplane to weather-vane. Subsequently, the airplane veered off the right side of the runway, the main landing gear collapsed, and the airplane came to rest nose down.
The airplane sustained substantial damage to both right and left wings and both lift struts.
The pilot reported that there were no pre-accident mechanical failures or malfunctions with the airplane that would have precluded normal operation.