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HAL
Vang same as traveler ; except when the traveler is to windward creating a mainsheet angle which allows the boom to rise when the boom is centered or above?In all other instances ,the traveler within its length of travel uses the mainsheet to pull down on the boom or the vang pulls down on the boom to maintain sail shape. Then the traveler or mainsheet in the case of the vang is used to set the angle of attack