
and here's another of how it works:

and for those REALLY interested, here's the article:
http://www.machinedesign.com/ASP/strArt ... rticle.asp
for me - it's the sort of thing I would LOVE to have a go on, but I'd hate it if there were a couple of guys out at my favourite break on them! Complete hypocrite really I guess!
They do look fun though.......