Mainsails and jibs use halyards to determine the shape of the sail and also its movement. Adjusting the mainsail allows the boat to heel better, so offer improved speed. By putting the tiller or wheel over and then releasing the main you change the direction of the boat.
Jibs increase the speed of the boat through the water.When going upwind, they are the first contact that the wind has with the boat. Ropes are tensioned by winches if necessary and then cleated until a change is required. As they are under tension constantly, their characteristics need to show a high degree of strength, very little elasticity and ease of coiling up with out kinks.
Generally on racing boats these lines are unique to the job of mainsail and foresail. The mainsail requires other lines as well, for example the boom kicker and down haul. Which serve to regulate the boom when it's powered up.
These warps tend to be made from from liquid crystal polymer. Polymer is a bi product of the oil industry. Man made of course. The inherant strength of these ropes are due to the process by which they are made.
How The Cunningham And Halyards Work
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