According to the pilot in the tailwheel-equipped, experimental, amateur-built airplane, he had practiced two takeoffs and landings and then decided to refuel the airplane. After refueling the airplane, he flew one more pattern before flying to his home airport. The pilot stated that, during the landing flare, the airplane "seemed as if it was being pushed down." The left wing struck the runway, the airplane landed on the right main landing gear, and the airplane then bounced. The propeller struck the ground, and the airplane exited the right side of the runway and then stopped. The airplane sustained substantial damage to the left wing spar. The METAR at the airport about the time of the accident reported that the wind was calm. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.