Interesting point. Superficially it's a motor vehicle since it uses a source of power other than the rider, so definitely not a bicycle looked at that way.
Yep Kite Biking has existed since at least the mid/late 90's and probably longer but thats when I first saw one.
In reality I think the idea is that when going up wind you just let the sail loose so it just flaps about.The problem with wind powered bikes is realised when tacking across the full width of the roads when riding against the wind. Those travelling in the opposite direction tend to get upset.
Of course, I was only joking, and on the e-bike version that would take care of against the wind anyway. This could be good in the flatter areas like some eastern counties and the Netherlands where winds can be stable in strength and direction so give consistent thrust. It would be useless in my hilly and high hedged area where winds are gusty and change direction unpredictably from moment to moment and the lanes twist frequently.
Yea I realised that but did others
