Describes a hull surface, structural frame, or drawn line that sweeps in a perfectly smooth, continuous curve. In shipbuilding and lofting, a fair curve is essential for both hydrodynamic efficiency and aesthetic appeal. Shipwrights spend significant time checking that frames and plating are fair before final welding or planking, ensuring no localized distortions disrupt the water flow.
Heard on the job
Run a batten across those frames to make sure the curve is fair before we start welding the shell plating.
Insider tip
A traditional shipwright checks if a hull is fair by resting their cheek against the planking and sighting down the length of the vessel.