How to Trim the jib ?

How to Trim the jib ?

How to Trim the jib ?

The principles of sail shape and trim apply similarly to the jib. But some of the controls we cover in the preceding section apply to the mainsail only. Because your jib is the first sail to "see" the wind when you're sailing closehauled, take a closer look at some of its controls.

The sheet is the most important control, because it affects the angle of attack of the sail. Get the sheet right, and you're doing better than most sailors on the water today! Simply ease out the sheet until the sail begins to luff, and then slowly pull it in until the luffing just stops.

The halyard usually controls luff tension on the jib, just like on the mainsail, and the same rules apply. However, the jib doesn't have an outhaul to adjust foot tension or a boom vang to control twist. The jib sheet does all that work, with a little help from the jib leads. The jib leads, or jib cars, are the first fittings (usually a pulley or fairlead) through which each jib sheet (one on each side) passes as it comes from the sail on its way to the cockpit.

Jib leads are typically adjustable fore and aft and affect the jib's twist. Move a lead too far forward and, as you trim the sheet, it pulls down on the jib leech too much, acting more like a boom vang and less like an outhaul. Move a lead too far aft and, as you trim the sheet, it pulls out on the foot excessively but doesn't pull down on the leech enough.

As the wind increases, you move your lead back to twist and decrease power in the jib. Some boats, mostly larger keelboats, have several jibs in varying sizes and strengths. In general, you want to use the biggest sail in light winds and the smallest sail in strong winds (for reduced power).

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