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Lee helm
Lee helm is the tendency of a sailboat to turn away from the wind while under sail. It is the opposite of weather helm which is the tendency of a sailboat to "round up" into the wind. A boat with lee helm will be difficult to sail Close Hauled and tacking may be difficult.
==Description==
Lee helm is considered dangerous in a sailboat. While sailing, if left to its own devices a boat with lee helm will bear (turn) away from the wind, accelerate, and perform an accidental or uncontrolled gybe, perhaps repeatedly. In an uncontrolled gybe the force of the wind moves the sails and boom from one side of the boat to the other. In a strong wind this movement will by very fast and forceful and can damage the boat, the sails, injure the crew, and even cause the boat to Broach (lie over on its side).
The root cause of lee helm is when the center of pressure exerted by the wind on the sails falls too far forward of the center of resistance of the hull—the natural point at which the hull tries to pivot. This tends to push the bow of the boat away from the wind. This can be due to a poor design, for example with the mast too far forward.
A small amount of lee helm can be counteracted with the rudder, but this introduces significant drag in the water and slows the boat. A small amount of lee helm can also be cured by raking the mast backward, reducing the size of the Jib on a Sloop rigged boat, or increasing the size of the mizzen sail on a Yawl or a Ketch. Large amounts of lee helm can only be corrected by altering the placement of the mast(s) or keel/centerboard --- a non-trivial venture.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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