Cool, that is, thanks. Would you say this is a very popular thing among sky divers? Meaning would a lot of them use it or ?? Do you know who makes the wind tunnels or is just build it yourself? Why is there only a few in the US, not tha popular or ?? Also, are the fans on the bottom or top, does it blow you up and suck you up? I couldn't tell by the picture. Any more links besides that one? I'm just trying to get anyone's opinion on this, and if it would a be a good idea to offer this as a business? PS: How much does it cost, 100, 200K? Thanks Curtis