Hovercraft
My hovercraft is 6ft by 4ft and constructed from 3/4" plywood. it's powered by a 300cfm leaf blower for lift and a two-cycle weed-whacker with a 24" propeller for propulsion. It hovers about 8 inches off the ground and can carry one (light) person...I weigh about 150lbs.
Some Pictures of the hovercraft sitting in my garrage: (click to see a larger version)
And some pictures of the hovercraft in action!
If you want more information, or plans, or help building your own hovercraft, please e-mail me at tophert_2001@yahoo.com, I'll be glad to help anyone who's interested in building one of their own.