I wanted to build one so badly – I remember those ads. One day I saw the extension cord though then I was like, OH COME ON!
I credit/blame David Horowitz. He had a show called “Fight Back!” which was a pro-consumer show which exposed common scams and gave helpful advice. I loved the show.
He never mentioned the hovercraft… I just noticed the extension cord in one of the ads once and it ‘clicked in’.
I still want one though. You can make one with leafblowers – saw it on Mythbusters. Noisy sucker though smile emoticon