View source for Sail

A '''sail''' is an expanse of a fleixble material (likely [[fabric]]) that produces thrust when wind pushes up against the surface of the material. Sails were used in the construction of some [[boat]]s and most [[ship]]s before the advent of [[steam]].

[[Viking]] [[longship]]s had square sails made of [[wool]] likely coated with a material to render them more effective.

[[category:artefact (medieval)]]