Yet another senseless death of a kite tube rider, this time in Ontario, Canada. While action to investigate and ban the kite tubes is underway a solution can not arrive soon enough. How many more people have to be seriously injured or killed because of this thing!?
A flat kite (whether it’s slightly concave on the bottom is irrelevant) will not be stable with out a large amount of drag on the back of the kite. Couple that with the riders weight and movements constantly changing the angle of attack; How can it be stable? then combine all of that with the boat possibly heading across the wind, and wind gusts and you have an uncontrollable situation!
Don’t do it, it’s not worth it!
EDIT: July 13,2006
Here is a follow on story that is referenced in the comments. The driver of the boat was drunk…