Flat Wing kites, like the ones in this video, were very unstable and prone to crash. These have been replaced by the newer delta wing kites that shows like Tommy Bartlets and Cypress Gardens use now. These flat wing kites would crash if they got to far onto their side or if they lost the pull from the boat (ie rope was released or boat stopped). I saw a guy crash onto the shore in front of a crowd in the early 90s. I thought the guys I saw flying this things were nuts, but some of the guys in this video are flying without a harness...death!