What happened
The pilot reported that shortly after takeoff at an altitude of 3000 feet mean sea level, the engine began running roughly. The pilot attempted to return to the airport of origin but lost all power while en route. The aircraft subsequently collided with the terrain during a forced landing in a farm field. Weather conditions were visual meteorological conditions, and no flight plan had been filed.
The investigation
Post-accident inspection revealed that the right main gear was sheared off and the nose gear was bent. The left wing sustained substantial damage. Examination of the engine showed the oil filter contained fine chips of aluminum. The oil pump appeared operable, but all six connecting rod bearings were heat scorched.
Findings
The mechanical evidence points to a catastrophic internal engine failure. The presence of aluminum debris in the oil filter and heat-scorched bearings indicates severe internal component wear or breakage prior to the loss of power.