On July 25, 2014, about 1108 eastern daylight time, an experimental amateur-built VP1, N3831W, was substantially damaged when it impacted terrain while attempting to land at Grove City Airport (29D), Grove City, Pennsylvania. The private pilot was seriously injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local personal flight, which was conducted under the provisions of 14 Code of Federal Regulations Part 91.According to an employee of the fixed base operator at 29D, the accident pilot was performing takeoffs and landings in the airport traffic pattern, and had completed three to four circuits when the accident occurred. She watched as the airplane was on final approach to land on runway 28; about 1/4-mile from the runway threshold, it suddenly "jerked" left, away from the runway centerline. The airplane continued on that track in a shallow descent until it impacted a berm about 200 feet south of the runway, about 750 feet beyond the threshold. Prior to impact, the engine sound was smooth and continuous, and did not change in pitch or intensity. The engine sound continued uninterrupted until impact. Medevac personnel based at the airport subsequently responded to the accident site to render assistance to the pilot. Due to the nature of the injuries he sustained during the accident, the pilot was unable to recall any details of the accident. The pilot, age 83, held a private pilot certificate with a rating for airplane single-engine land. His most recent Federal Aviation Administration third-class medical certificate was issued in June 2010 with the limitation "must wear corrective lenses." He also held an experimental aircraft builder repairman certificate for the accident airplane. None of the pilot's personal flight logs were available for inspection and his total flight experience could not be determined. The airplane's airworthiness certificate was issued in December 2010. It was equipped with a Volkswagen 65 horsepower engine driving a Heagy fixed-pitch propeller. The airplane's most recent condition inspection was completed by the pilot on July 18, 2014, with no anomalies noted. Federal Aviation Administration inspectors examined the wreckage after it was recovered from the accident site. During the examination, the inspectors confirmed flight control continuity for the elevator and ailerons. The rudder pedals had separated from the fuselage floor during impact, but were otherwise intact and connected to the rudder. The engine was separated from the fuselage, though the engine control cables remained connected and intact. Continuity of the engine power and valvetrain was confirmed through rotation of the crankshaft, and thumb compression was noted on all cylinders. The spark plugs exhibited a clean appearance with a small amount of external corrosion. Fuel and a small quantity of dirt were found in the fuel filter and in the carburetor float bowl.