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Johndesu said..
Ok Colas I see so what angle do you think the front wing should be?
I dont know, foil designs must be done as a whole. I wont have the expertise to predict its behavior without trying it.
I would recommend to have somebody that know how to foil just try your foil first, it could avoid you hours of frustration. The only people I know with an alibaba foil never managed to fly, and quit foiling.
Or, if you do not manage to make progress, try to borrow/try another foil first before calling it quits.