Did somebody say Hovercraft?!!?
No, its not mine.

But I've been planning on building one like it for some time now.
Its a twin engine (.40 airplane engines) craft. The thrust fans in the rear are varible pitch (like a helicopter) so you can go into reverse on the fly, and the adjust independantly, so you can speed up one fan and slow the other to help in tight turns.
The other engine is strickly for the twin lift fans. Very cool rig indeed.