What are “Center X and Center Y (fraction of chord width)”?
A. It is where the cross-hairs intersect on the profile section. Supposed to be the center of lift or center of weight or center of torsion. You don’t need to change this as the default is reasonably centered. All the sections should align on this center.(Drill a hole to ensure this). The purpose of choosing and aligning the centers is to minimise distortion of the blade under load conditions (centrifugal or aerodynamic) or to know where to add a balancing weight. It might even be adjusted to give sweepback and deliberate aerodynamic twist under load.
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