drunk cowboys have tried to lift themselves by their own bootstraps -
I am amazed at the ongoing nitpicking about what creates lift-
I feel that simply knowing that a pressure differential will create lift - is enough for almost any purpose. .
The long winded theories which went on ad nausium here,about air moving downward from the trailing edge etc., always made my eyes glaze over
Mother nature shows many examples of lift at play - and they all demonstrate pressure differences .
Once pressure is equal - nuthin happens- if pressure is unequal, mama nature will try to help rebalance things
On the helicoper demo the board created a closed enviroment -(same as a helicopter in a box with the skids nailed to the floor)
sort of like the plane on the conveyer belt thing -it is no t a lesson in aerodynamics - it is just an example of logical outcome..