The pilot reported that he had just started flying this airplane five days before the accident as a contract pilot. Over the past four days, the operator had the airplane on the "ready pad" with all of the tie-downs and gust locks already removed. On the day of the accident, the airplane was tied down with all of the gust locks still installed. Prior to takeoff, the pilot completed a preflight inspection but did not remove the rudder gust lock. During the takeoff roll, the pilot had to use the brakes to keep the airplane centered on the runway, which made for a much longer takeoff roll. The airplane dragged in the 10 ft high corn off the end of the runway and lost lift, so the pilot made a forced landing in a field. During the landing roll the airplane collided with a tree and sustained substantial damage to the fuselage, both wings, and empennage. The pilot reported that there were no mechanical malfunctions with the airplane. He stated that he should have completed a more thorough preflight inspection.