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Reefing is the means of reducing the area of a sail, usually by folding or rolling one edge of the canvas in on itself. Reefing improves the performance of sailing vessel in strong winds, and is the primary safety precaution in rough weather. Reefing sails improves vessel stability and minimizes the risk of damage to the sail or other gear. Proper skills in and equipment for reefing are crucial to averting the dangers of capsizing or broaching in heavy weather. ==Conventional reefing== Sails may have built-in alternative attachment points that allow their area to be reduced. In a mainsail, one to four horizontal rows of cringles or lines, called reef points, may be placed above the foot of the sail. Rolling up the foot of the sail and tying these reef points to the foot of the sail forms a new tack and clew, reducing the sail's area. More than one row of reef points increases options for possible sail area. To reef the sail of a Bermuda rigged sloop: # The boat should be brought head-to-wind (in irons). # Lower the jib and main sail. Leaving the jib up allows it to turn the boat away from the wind. Lowering the main just enough to reef runs the risk of having the wind change directions, blowing the main outboard and filling the sail. Set the boom in the boom crutch and pull the sheet tight. # Lash the tack reef cringle to the boom. Pull the leech reef cringle away from the mast, stretching the sail taut along the boom. Lash the leech cringle to the boom, and then to the end of the boom. Then tie the remaining reefs with sail ties. With lighter gauge sails or reef points reef the sail to itself rather than around the boom to prevent the reefing cringles from being torn out. Secure the sail ties with a reef (square) knot. # Once the sail is reefed, raise the main, stow the boom crutch, raise the jib, and bear off. If the reefing is done while moored or in sheltered waters, the sail to be reefed need not be lowered entirely. One crewman must pull the reefing line as another crewman lowers the sail. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「reefing」の詳細全文を読む スポンサード リンク
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