Leo, A kite is more then a bit faster then a windsurfer, on water. Now the vessel "greenbird" is in no way shape or form a windsurfer it has a person inside a cockpit not standing on a board (or even skiis for the sake of argument). Lets face the true realality that a person on a kite is faster then a person on a windsurfer.....place your ego, and or your internet poise aside and be real on your local forum. We are all friends here taling about sailing. In this thread I was sharing how fast I went this winter with my local crew

Not argueing what is faster. Your sail mast and boom statement is bunk. no one is rigging cloth on these speed machines.
Now if you truley believe you can't make a kite that is not inflatable but a single piece of materal , I would make a composite wing on a set of strong strings, and pair it with a suitable sliding device that you can hual ass, that you may be faster then a non movible sail that can not be stroked to create more power then you are really pigeon holing your self with in the box bordem and not real foward thinking.
A moveable sail that stokes through the window can and will generate more aperant wind , these are not my rules. but the rules of physics. As soon as some one (like Richard Bransom) bank rolls a true kite top speed project no current kite has the chance to compete with a composite winged cockpit vessal on land.
Don't you find it amazing that the first sailor (on water) to break the 50k mark was a kiter on a inflatable almostk
stock kite, So one dude on less then 3000 dollars worth of gear crushed the threshold multimillion dollar vessals have felt was the Grail. If you can't give a kite credit for that then It will blow my gord.
The idea of going 80 plus with out a metal frame is old school, On skiis, on a snowboard, aboard a cycle, etc. many off us on this forum go out and do it daily, I think 80 is very slow and a conservitive number for high end speed with a kite on a low friction surface. It just happened on a wheeled buggy with a little kite, with proof in this thread.
Lets give some credit where credit is due. I have sailed lots of stuff and respect them all. I see the kite as a exciting chance to go faster, thats who I am and how I sail. Get me and my friends a budjet and I bet we can turn some heads

There is still so much room for kite improvement and research.