Incident Overview
Shortly after takeoff, the radial engine of a vintage biplane experienced a partial loss of power, preventing the pilot from maintaining altitude. The pilot, a commercial pilot with 4,900 hours of flight experience, initiated an emergency descent and elected to turn the airplane toward an open field.
Landing and Aftermath
During the approach to the field, the pilot attempted to avoid a tall fence, resulting in a hard landing. The airplane sustained damage from the hard landing, but there was no postimpact fire. The pilot and passenger were able to egress the airplane unassisted.
Investigation Findings
An examination of the airplane's engine and fuel system revealed no preimpact anomalies. The reason for the partial loss of engine power could not be determined during the investigation.