Jibs

Jibs are a term with two common nautical and industrial meanings. In sailing, a jib is a triangular headsail set forward of the mainsail, attached to the forestay and controlled by sheets. In industrial contexts, a jib is the projecting arm of a crane from which the load is suspended or moved.

In sailing, the jib is one of the primary headsails and is used to balance the rig and improve upwind performance. Jibs are described by their luff length relative to the foretriangle. A standard or 100% jib has a luff equal to the height of the foretriangle; larger sails that overlap the mainsail are called genoas, often specified by a percentage such as 110% or 130%. A small, non-overlapping storm jib is used in heavy weather. Other common variants include the working jib (general purpose) and, for light winds, larger overlapping jibs or genoas. The luff runs along the forestay; the tack attaches at the bow; the clew is the lower aft corner. Sheets control the angle to the wind, and jib size and cut affect upwind ability, handling, and balance of the vessel.

Jib cranes are a different use of the term. The jib in this context is the horizontal or inclined arm that extends from a crane’s mast to support the load. Jibs can be fixed or swiveling and may carry a trolley or hoist that travels along the arm. Their length, load capacity, and mounting determine reach and stability; jib cranes are common in shipyards, warehouses, and other industrial settings for lifting and positioning heavy objects.