What happened
The pilot reported that he typically configures 10 degrees of flaps prior to initiating takeoff. Upon applying full power, he realized the flaps had not been extended. In an attempt to correct the oversight, he removed his left hand from the throttle and reached down with his left hand to manipulate the flap handle. During this maneuver, the right wing contacted brush along the narrow airstrip. The airplane subsequently swerved to the right, resulting in a collision with trees.
The investigation
The aircraft sustained substantial damage to both wings and the fuselage. The pilot noted that he resides nearby and normally operates from this specific airstrip.