Introduction
A Cessna 172 aircraft, modified under an approved Supplemental Type Certificate (STC) to a 'Texas Taildragger' configuration, experienced an engine anomaly shortly after departure.
Flight Events
The flight was conducted for the purpose of the pilot obtaining a biennial flight review. According to the pilot, immediately after takeoff, the engine began to progressively lose power, with the exception of two or three short power surges. The flight instructor (CFI) reported that he activated the boost pump and adjusted the mixture control, but these actions did not produce positive results. The CFI noted that the engine never completely lost power.
Emergency Landing
Assuming control of the aircraft, the CFI executed an emergency landing by maneuvering between houses and obstructions. During the landing, the aircraft struck a power line, a fence, and a ditch.
Examination
An examination of the engine and aircraft revealed no major discrepancies that would have resulted in a loss of power. The density altitude at the time was approximately 6,800 feet.