Moonsail

Also known as a skysail or moonraker.

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A moonsail is a sail flown immediately above the "royals" (see sail plan) on large square rigged boats. This is a relatively unusual sail only used on very large boats built primarily for speed, such as the Cutty Sark.

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Sail: A sail is any type of surface intended to generate thrust by being placed in a wind —in essence a vertically-oriented wing. Sails are used in sailing....

Sail plan: A sail-plan is a formal set of drawings, usually prepared by a naval architect. It shows the various combinations of sail proposed for a sailing ship....

Square rig: Square rig is a generic type of sailing vessel in which the main horizontal spars are perpendicular to the keel of the ship. These spars are called yardarms or simply yards. Square rig was the main design in the age of sail....