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A secondary sail on a ship is a sail that assists the primary sails. Primary sails provide the main propulsion in normal weather, while secondary sails help balance the ship or offer additional driving power. These secondary sails are variations of the main sail types. Sails are often categorized by their function, such as cruising sails for everyday conditions, summer sails for warmer weather, storm sails for severe weather, and racing sails. The names of sails are frequently derived from the rigging they are set on or their location relative to other ship parts.1

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