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| A long, flat strip of squared wood or metal used to stiffen sail. Placed in pockets along edge of sail. |
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| A tall upright post, spar, or other structure on a ship or boat, in sailing vessels generally carrying a sail or sails. |
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| A boom is a spar (pole), along the foot (bottom edge) of a sail, that greatly improves control of the angle and shape of the sail. |
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| A rope loosely fastened along the centerboard case under which a sailor may tuck his or her feet while hiking |
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| A retractable fin extending through the bottom of a small sailboat to provide stability, reduce leeway and improve the efficiency of the sail. A movable keel. |
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| A submerged plane mounted in the back of the boat for steering a vessel. |
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| A long handle, attached to the rudder, used to steer the boat. |
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| A small piece of fabric, attached to the sail, to indicate wind direction. |
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| The line, or rope, attached to the far end of the boom. It travels through the boom block,and the main block. The other end is held by the sailor and allows the sailor to move the boom and sail back and forth. |
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Fabric designed and shaped to catch the wind and used to propel a vessel.
The one and only sail on an optimist (Opti) |
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| A thin stick, attached to the tiller, to allow sailor to control rudder while "hiking out" on windward side of boat. |
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| Tackle leading downward from the boom used to flatten the sail and adjust the angle of the boom when sailing off the wind. |
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| A small block and tackle rig, found at the intersection of the mast and boom. It helps adjust the shape of the luff of the sail. |
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| The main body of a the boat. The hull provides buoyancy. |
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| A personal flotation device (PFD)in the form of a sleeveless jacket made with flotation material to support a sailor if he or she falls into the water. |
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| A spar carried at an angle across the mast on which the sail is bent. The Sprit helps support the sail shape. |
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