(Pilot) Lost Control Of The Airplane As It Turned To The Left Despite The Application Of Full Right Rudder Analysis: The pilot was performing a pre-buy flight in the amateur-built airplane. The takeoff roll was normal until the airplane accelerated between 25 to 50 mph, when the airplane required right rudder to maintain straight flight. After liftoff, without pilot input, the airplane veered left of the runway. The pilot applied right rudder and was able to get the airplane back over the runway. However, he lost control of the airplane as it turned to the left despite the application of full right rudder. The airplane continued to the left until it impacted terrain. The pilot reported having completed a preflight inspection and high-speed taxi prior to the flight, and he did not note any problems.
