Flight and Incident
The pilot of an amateur-built Junior Ace reported that the purpose of the personal flight was to remain in the local area for about one hour. The airplane featured a single centrally-mounted control stick, a two-place bench seat, and two sets of rudder pedals. Approximately 20 minutes into the flight, the pilot initiated a left turn. When he attempted to turn right, the airplane yawed uncontrollably to the left. Applying additional right rudder input did not correct the yaw; instead, the yaw increased. The pilot stated that he could not stop the yawing motion and described the sensation as feeling like the airplane was stalling and about to spin.
Witness Observation
A witness on the ground reported observing the airplane's wings rocking back and forth in a smooth, slow, rocking motion.
Landing and Impact
In an effort to regain control, the pilot attempted to land in a field. During the landing approach, he flared the airplane high above the ground. The airplane subsequently impacted the ground and nosed over. The accident resulted in damage to the right main landing gear, the right wing rear strut, and the firewall.
Wreckage Examination
An inspection of the wreckage by a Federal Aviation Administration inspector revealed that all flight controls moved freely and exhibited full travel. The pilot reported that there were no mechanical malfunctions of the airplane prior to the flight. He also stated that during this flight, he sat in the center of the bench seat, straddled the control stick, and used the outboard rudder pedals.