Can normalized airfoil coordinates be sent straight to a blade manufacturer?

The short answer

No. Normalized coordinates describe proportions, not a finished blade section in millimetres. They can be useful geometry inputs, but a manufacturer also needs chord length, coordinate orientation, placement and section station. An apparently complete airfoil file can therefore remain insufficient for a wind-blade manufacturing decision.

Recover the physical scale

If a coordinate is supplied as x/c, multiply it by the specified chord c to obtain its physical chordwise distance. In a hypothetical section with c = 200 mm, x/c = 0.25 corresponds to 50 mm. The same normalized point lies at 75 mm for a 300 mm chord. No profile identity or dimensional acceptance follows from either illustration.

Keep shape and placement separate

A normalized profile can be translated, rotated and scaled before being placed on a blade reference axis. The trailing-edge convention, coordinate ordering and upper/lower surface identity must survive that transformation. Otherwise a correct list of proportions can produce a mirrored or incorrectly pitched section. A three-dimensional blade additionally needs the distribution of section positions and orientations; repeating one airfoil shape along a line does not define twist or sweep.

Define the manufacturing handoff

Request the coordinate file, physical chord, reference point, section plane and units together. Have the responsible blade designer identify whether the file describes the aerodynamic target, mould surface or finished external surface, since allowances are not interchangeable. NASA documentation supports normalized geometry terminology, not a MARSTON airfoil selection. Do not approve tooling from a unitless drawing or assume that enlarging a known profile preserves structural design, surface tolerances or validated aerodynamic performance. Keep the coordinate transformation with the physical section export. That lets the manufacturer reproduce the placement and reveals whether a unit conversion affected both coordinate directions equally or accidentally changed the profile proportions.