Incident Description
An aircraft experienced a directional control problem while operating from an unmaintained airstrip. The aircraft swerved on the runway, which was overgrown with brush approximately shoulder height for an average man. The pilot partially corrected the swerving, but the aircraft departed the runway end and nosed over.
Pilot Actions
The pilot reported that he had previously checked the airstrip during a solo flight and encountered no problems. When he returned to the unmaintained strip with a passenger, he faced a directional control issue. He maintained partial control of the aircraft but was unable to prevent the nose-over upon leaving the runway.
Runway Condition
According to the pilot, the brush on the strip was about shoulder height for an average man, indicating significant overgrowth. No other details about the runway or environmental conditions were provided.