According to the pilot in the tailwheel-equipped biplane, the purpose of the flight was to accomplish the first test flight of the experimental, amateur-built airplane. During the takeoff roll, the airplane yawed left when the tail lifted. He reported that the airplane became airborne but would not accelerate. The airplane remained in ground effect, exited the runway, collided with rising terrain, and subsequently nosed over. The airplane sustained substantial damage to the rudder and the left main and subwings. The METAR at the airport reported that, about the time of the accident, the wind was from 40° at 4 knots. The temperature was 81°F, and the dew point was 27°F. The barometric setting was 30.12 inches of mercury, and the airport elevation was 4,456 ft. The density altitude was 6,742 ft. The pilot used runway 8. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.