The non-certificated pilot reported to the Federal Aviation Administration (FAA) Inspector that he was interested in purchasing the single-engine tailwheel equipped airplane. The pilot added that during the take-off, and approximately 40-50 feet into the air, the engine lost power. The pilot also stated that he tried to turn back to the runway, but was unable. The airplane's tail hit the ground first followed by the main wheels. An examination of the airplane and engine by the FAA, failed to identify any pre-impact abnormalities. A check of the runway and accident site, revealed tire skid marks (on the runway) pointing to the crash site. The marks continued onto the grass, with the tracks corresponding to the landing gear of Aeronca. At one point along the path, the ground had four deep cuts, with the first two cuts measuring about 12-inches deep. The ground scars were consistent with a rotating propeller, being driven. A review of the pilot's certificate revealed that he was issued a student pilot certificate in April 1990, and did not have any flight instructor endorsements. The pilot did not submit a NTSB form 6120.1, Pilot/Operator Accident/Incident Report, as requested.