Why cant you compair a land kite to a water kite?
And sorry its the kite buggy land speed record
Even the best sail boat gets 2X on the water???????
Sailrocket is over 2X i think their in the 3X range and its a boat.
We are talking efficency of the system as a whole, if the board/ buggy/ boat whatever has alot of drag then that drags the system down. How fast would greenbird go with flat tires???
From the Greenbird site "A solution is required, where lift is maximised, BUT MORE IMPORTANTLY, drag is minimised.
The most drag at this point is the board to water interface. Maximise that and see where it goes.
OR throw lots of money at it and develop some kinda kite wing for super efficiency to make up for the drag of the board.