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Mainsail

A mainsail is the most important sail raised from the main (or only) mast of a sailing vessel.
On a square rigged vessel, it is the lowest and largest sail on the main mast.

On a fore-and-aft rigged vessel, it is the lowest and largest and often the only sail rigged aft of the main mast, and is controlled along its foot by a spar known as the boom. A sail rigged in this position without a boom is generally called a trisail, and is used in extremely heavy weather.

The modern bermuda rig uses a triangular mainsail as the only sail aft of the mast, closely coordinated with a jib for sailing upwind. A large overlapping jib or genoa is often larger than the mainsail. In downwind conditions (with the wind behind the boat) a spinnaker replaces the jib.

Traditional fore-and-aft rigs used a gaff to control the top of the mainsail, sometimes setting a topsail above it.

See:
• Boat
• Boat Types
• Skipjack Boat
• Mainsail
• Bermuda rig
• Watercraft
• Kayak
• Kayak Origins
• Folding Kayaks
• Recreational Kayaks
• Sea Kayak
• Whitewater Kayaking

• Adirondack Guideboat
• Airboat
• Vermont Fishing Dory

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Mainsail".