This is a scat racer.

This is a hovertrek rescue hovercraft the things on the back can close and dirrect the air forwards to make it go backwards.

In this picture you can see a sportsman race starting and a hovertrek.

This is Michael Murphy's hovercraft from St. Louis Hovercraft.

You can see some differnt hovertreks here.

This is the back of one a Neoteric Questreck. It was just discontinued by neoteric due to the production of their new design, the Hovertrek. They can also close one of the doors and spin.