Sven Donaldson, Author at Good Old Boat

Horizontal draft stripes on a sail make it feasible to determine sail shape. The draft of a sail at any given level is the depth divided by the chord, expressed as a percentage. Draft location is the distance between the luff and the deepest point in the sail’s curvature, again expressed as a percentage of the chord. These measurements are most easily obtained from a wide-angle photograph taken with the camera almost directly against the foot of the sail.

New sails for good old boats

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October 22, 2026