One of the first lessons you learn in a fixed-wing aircraft is to watch your prop wash. When the engine is operating, that airflow off the prop heads back toward the tail and will blast anything behind you. And you may be surprised at how far back it reaches.
On Sunday, I found myself in the viewing area outside the fence to the ramp at a local nontowered airport. There is a picnic bench there and some signage to explain the airport to the muggles (the aviation challenged). A fence with a gate code keeps the uninitiated out of the aircraft movement area.
