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My mainsail has a 16 foot E-dimension. Whats the difference between a 4-line system and a HD system?

April 26, 2017difference foot HD mainsail system

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My mainsail has a 16 foot E-dimension. Whats the difference between a 4-line system and a HD system?

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• The Heavy Duty (HD) system comes with stronger cheek blocks and 5/16″ control lines instead of 1/2″ . This allows the system to control the weight of a much heavier sail. A 4-line system will work fine on a mainsail with a 16 foot E-dimension.