Summary
During takeoff initial climb, the engine experienced a partial loss of power. The pilot conducted an off-airport forced landing in an open field, during which the landing gear collapsed.
Accident Narrative
The pilot arrived at the airport and performed a preflight inspection, which included checking the fuel tanks for contamination. No discrepancies were noted during the preflight inspection, start-up, taxi to the active runway, or run-up. Shortly after takeoff, the pilot reduced the throttle and revolutions per minute (rpm) to 25 inches of manifold pressure (MAP) and 2,500 rpm for best rate of climb. Soon after, the pilot observed that climb performance was substandard and decaying, and the engine appeared to have reduced power output. Due to marginal climb performance and decaying power, the pilot decided to land in an open field. During a turn to remain over the intended landing site, the engine began to misfire. Engine power continued to decay even though the throttle was full forward, mixture set to rich, and the fuel selector was selected to BOTH. While on downwind, the pilot noted obstructions at the end of the intended landing site. Given the current rate of descent, the pilot believed the airplane would overrun the field and impact the obstructions. The pilot lowered the flaps to 20 degrees and initiated a left 90-degree turn for a clearer landing area. During the flare, the left wing tip struck the ground first, causing the airplane to bounce. Upon touching down again, the right main landing gear collapsed.
Post-Accident Inspection
A post-accident inspection and ground run of the engine were conducted by a Federal Aviation Administration inspector. No preimpact mechanical anomalies were identified that would have precluded normal operation.