On July 1, 2011, about 1830 eastern daylight time, an experimental amateur-built Couvillion S-17, N433GC, sustained substantial damage when it impacted the terrain following a loss of control during takeoff from runway 04 at the Toledo Executive Airport (TDZ), Toledo, Ohio. The private pilot was not injured. The airplane was registered and operated by the pilot as a personal flight under the provisions of the 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed at the time of the accident. The airplane was departing on a local flight. The pilot reported that it was his first flight in the airplane since he had purchased it from the previous owner. He reported that he inspected the flight controls and the cable attachment points during the preflight inspection and they appeared normal. The engine run-up and before takeoff checks were normal. He reported that he applied the throttle slowly to full power during takeoff. The airplane tracked straight on the runway until after liftoff. He reported that immediately after liftoff, the airplane entered into a sweeping right turn. The pilot was unable to keep the airplane from turning to the right as it climbed to about 200 – 300 feet above the ground. The airplane had turned about 180 degrees when he pulled the throttle to idle and attempted to land in a field. The airplane continued to turn as it overflew a fence, landed hard, and impacted a rock pile during the landing roll. A Federal Aviation Administration inspector examined the airplane and reported that it had sustained substantial damage. The airframe was twisted and the left wing bent. The right main landing gear was sheared off, and the right horizontal stabilizer was torn on the bottom. The right rudder pedal was sheared off. The right rudder cable was found slack and the cable attachment was found twisted around the right rudder horn attachment fitting. When the cable was straightened, it was the proper length and it confirmed rudder cable continuity. Flight control cable continuity was confirmed from the flight controls to their respective attach points on the flight control surfaces. No mechanical discrepancy was noted that could explain the reason for the uncontrolled right turn. The airplane had a total of 4.1 hours of flight time at the time of the accident. The pilot held a private pilot certificate with single-engine and multi-engine airplane land ratings and a single-engine seaplane rating. He held a third class medical certificate. He reported that he had a total of 1,353 flight hours, but with no flight time in the make and model of the accident airplane. He had built and flown a two-seat experimental amateur-built airplane that was similar to the accident airplane, and had logged about 150 – 200 hours of flight time in it. The original builder of the airplane reported that three pilots had flown the airplane prior to him selling it to a second owner. He reported that the three pilots did not indicate any discrepancies with the airplane. At 1953, the surface weather observation at TDZ was: wind 090 degrees at 6 knots; visibility 10 miles; sky clear; temperature 29 degrees Celsius; dew point 17 degrees Celsius; altimeter 30.00 inches of mercury.