Air reaches the skirt area from the hovercraft’s EDF (Electric Duct Fan — the big one on the back) which pumps the air through a rectangular hole in the base. A servo mounted behind the fan ...
Back to the Future fans will swoon over this "DeLorean ... That's fiberglass but that's from a real DeLorean." The hovercraft took a total of four-and-a-half years to build.