The pilot stated that the purpose of the flight was to conduct takeoffs and landings in the airport traffic pattern. Prior to initiating his departure, he confirmed the flight control and flap systems were operating normally. Just after takeoff, the airplane banked "hard" to the left, and the pilot applied full right rudder and aileron control inputs to correct. The pilot reduced engine power and leveled the wings, and the airplane subsequently impacted trees. During a telephone interview, the pilot reported there were no mechanical malfunctions or anomalies that would have precluded normal operation. According to a local weather observation facility, winds were reported as calm at the time of the accident.