You should never fly close to persons, even how small or light the plane is it might cause damage to another person if taken by suprise. Haven´t ama gor rules about where to fly? In Sweden spectators and non flying pilots should be behind the safetyline in a maked area....

However while training 3D I´m usually out alone, when hovering low it happens I get a bump by the plane. [link=http://www.henke.rchomepage.com/video/diablotin8.wmv]vid[/link]