The pilot of the tailwheel equipped airplane reported that, prior to takeoff, he adjusted his seat. During takeoff, his seat slid back and he was not able to reach the rudder pedals or throttle lever. The airplane accelerated, veered left, exited the runway to the left, ground looped, and impacted a berm.
The airplane sustained substantial damage to the right wing.
The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.