See also: Cap (homonymy)

The cap S are light veils which one suspends with Vergue S mobiles ( boom ), fixed temporarily at the ends of the usual yards of the sailing ships with square Gréement to increase the power of traction to bearing (back or large wind loose).

Form of a long square, slightly trapezoidal, they have about the suface half of the veil at side of which they are gréées. Veil light wind, they are generally installed only on the lower yards and the topsails and make it possible to gain a little bit of speed on long crossings. They were dreaded Gabier S because of the risks of fall during their establishment because, clearly outside the ship, they did not have any safeguard. So and given that a tacking or a stop was impossible before hours, the fall synonymous with had died by drowning.

The caps with a grid are fixed at the lower sailss by meshs (eyelets close to the rope) and moored by listenings at the points of the caps. second caps with a grid can be laced with the caps with a grid. The caps with a grid of the topsails are added at the ends of the yards on the boom .

An operation of fortune to caulk a Voie of water consists in plating a cap outside the hull; the cap is then aspired by the way and the mouth.

The Clipper S used much the caps at the time of the " races of the" , where a high speed was paramount during all the voyage.