I didn't understand first part about load transfer but your explanation about effective sweep,rake and cant is very interesting.
if you hold sail more upright you must lower the boom to get more out with body..
Planing board steer with foot steering,railing board on edges..
Sail steering is used for old school long board ,when board is not planing
Yes that is correct, I didn't think about that..
Only problem is when board goes +50knots than there is no need for additional vertical lift from...
Sail lean to windward produce vertical lift
But sail chord line(boom) is almost allways parallel to board center line, so even sail is raked back doesnt mean it is reaked to windward .....
Isnt sail raked to windward produce some vertical lift,not raked back?
Why do you mean that raked back produce vertical lift?
So concluson is that upright concept wouldnt work at wsurf,so people from windsurfong industry know baiscs aerodynamics?
with upright sail you can have smaller sail with same lift/"power".so you reduce aero drag and go faster..
Also smaller sail has lower center of...
To test my concept I must make new mast track 25,30cm back at board deck and increase sail foot area to close gap with new sail position...
Why my sail orientation is not good? Rider is not moving much ,his postitin is fixed in footstraps
But this not answer my question
You also can do this with upright sail if you design mast track more back and increase sail foot ..
So I still dont understend why they use this...
Why windsurf use raked sail,if upright sail has higher lift coefficient and it is more efficient?
So much rake basicly kill sail power..