The pilot-in-command (PIC) of the tailwheel airplane stated that he was flying from his private airstrip, with a friend who was also a pilot. The friend did not have much experience in tailwheel airplanes and had not flown the airplane from the airstrip. The PIC was in the front seat and his friend was in the rear seat. The PIC completed two takeoffs and landings uneventfully, and then let his friend perform the third takeoff.. During the takeoff roll, as the tailwheel lifted, the airplane yawed to the left. The PIC then took the controls and attempted to correct the yaw; however, the airplane traveled off the left side of the runway and impacted trees, resulting in substantial damage to the fuselage and left wing. The PIC reported no mechanical anomalies with the airplane and added that the wind was light and variable at the time. The PIC stated that he should have taken control of the airplane sooner.