Struggling to make a perfect surface from the foil curve

Hi Everyone, I’m encountering a problem to make a surface from the curve and i used the polysrf command but in the trailing edge of the curve it is struggling to make a surface, can anyone help me please and tell me why is this happening and tell me how to do it please.

new try feb 17.3dm (156.0 KB)

So your tolerances are set too loose, the trailing edge is shorter than your absolute tolerance, so it closes the curve by moving the ends instead of adding a segment. Shrinking the tolerances to 0.001 M makes it work as expected, but those are still not really the units I would use for this, 0.01 mm would make more sense.

thanks a lot jim for the help