What happened
During the initial climb phase following takeoff, the engine experienced a partial loss of power. The pilot had reduced the throttle and revolutions per minute to 25 inches of manifold pressure and 2,500 rpm to maintain the best rate of climb. Shortly after this adjustment, the pilot observed that climb performance was decaying and the engine output appeared reduced.
Due to the marginal climb performance, the pilot decided to perform an off-airport forced landing in an open field. While performing a turn to remain over the intended landing site, the engine began to misfire. Despite the throttle being at full forward, the mixture set to rich, and the fuel selector set to both, the engine power continued to decay.
While on the downwind leg, the pilot identified obstructions at the end of the intended landing area. Fearing the aircraft would overrun the field and impact these obstacles, the pilot lowered the flaps to 20 degrees and initiated a left 90-degree turn toward a clearer area. During the flare, the left wing tip struck the ground first. The aircraft bounced, and upon the second touchdown, the right main landing gear collapsed.
The investigation
A post-accident inspection and a ground run of the engine were conducted by a Federal Aviation Administration inspector. The inspection identified no preimpact mechanical anomalies that would have prevented normal operation.