Incident Overview
During the takeoff roll, the cabin door opened unexpectedly. The pilot elected to abort the takeoff and return for a landing. The pilot reported being distracted by the resulting wind noise and feelings of nervousness, which caused a failure to ensure the landing gear was extended.
Sequence of Events
As the aircraft flared for landing, the propeller contacted the runway surface. In response, the pilot added power in an attempt to climb and extend the landing gear. However, the gear only partially extended. The aircraft then settled back onto the runway before the gear could fully extend and lock into the down position.
Findings
The pilot's distraction from wind noise and nervousness led to a failure to confirm landing gear extension before touchdown. The subsequent go-around attempt was unsuccessful due to incomplete gear extension.