Incident Overview
A pilot reported that the engine lost 50% power shortly after takeoff. In response, the pilot applied full carburetor heat for approximately three minutes, then moved the carburetor heat control to the half-on position. The airplane remained airborne for several additional minutes as the pilot attempted to locate a suitable landing area.
Engine Performance and Landing
During the flight, the pilot observed that the engine manifold pressure would not exceed 23 inches even with full throttle applied. Eventually, the engine lost all power, and a forced landing was made in a soft field. During the landing, the airplane nosed over.
Post-Accident Engine Examination
After the airplane was recovered from the crash site, an attempt was made to run the engine. It initially ran rough when started, then smoothed out and developed power. The engine achieved near-maximum rated revolutions per minute, and no problems were noted.
Weather and Icing Probability
Examination of a carburetor icing probability curve revealed that the reported weather conditions were favorable for light icing at glide or cruise power settings.