Incident Overview
The pilot reported that the airplane "hesitated" during the takeoff roll due to the added weight of passengers on board and the grass surface of the departure airstrip, Jim Finlay Farm Airstrip. To compensate, the pilot added "extra" engine power at rotation. However, the left engine accelerated more quickly than the right, resulting in an adverse yaw to the right.
Collision and Damage
The adverse yaw caused the airplane to veer right, leading to a collision with trees along the right side of the runway. The subsequent impact with trees and terrain resulted in substantial damage to the airframe. According to the pilot, there were no mechanical deficiencies with the airplane that would have prevented normal operation.
Probable Cause
The official probable cause is the pilot's failure to maintain directional control during takeoff.