@RSJB18 posted:You nailed it Bob. The air column holds the ball inside. It is a neat car.
Bernoulli principle. The moving air column generated by the fan is at a lower pressure than the still air around it. As the ball moves out of the column, the higher air pressure outside of it pushes it back in. It's why airplanes fly. At constant airspeed, air moves faster across the curved top surface of the wing than the flat bottom surface, resulting in lower pressure above the the wing than below it, generating lift. Regardless, I've got to have one of these now. Do they make it in 3-rail?
