www.facebook.com I've made some prototype tubes about 20 to 30 feet tall tubes that create a lot of drag / power in the wind.
I think they could be good for Stand Up Paddleboards to go downwind without needing to paddle. Maybe even hydrofoilers could make it work to go upwind and eventually surfers, when designs get modified and evlove. I'm looking to build more prototypes and test them here on Maui to eventually do a production run and some promotions to get it off the ground. I'ts actually a lot of fun just to stand on the beach with one on. there is a lot of power there.