Mainsail

From Wikipedia, the free encyclopedia

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.


Sails, Spars and Rigging
Sails
Course | Driver | Extra | Genoa | Gennaker | Jib | Lateen | Mainsail | Moonsail | Royal | Spanker | Spinnaker | Spritsail | Staysail | Studding | Tallboy | Topgallant | Topsail | Trysail
Sail anatomy and materials
Clew | Foot | Head | Leech | Luff | Roach | Tack | Dacron | Kevlar | Twaron
Spars
Boom | Bowsprit | Fore-mast | Gaff | Jackstaff | Jigger-mast | Jury Rig | Main-mast | Mast | Mizzen-mast | Masthead Truck | Spinnaker Pole | Yard
Rigging components
Backstay | Block | Boom vang | Braces | Buntlines | Cleat | Clevis Pin | Clewlines | Cunningham | Downhaul | Forestay | Gasket | Gooseneck | Guy | Halyard | Outhaul | Parrell beads | Peak | Preventer | Ratlines | Rigging (Running) | Shackle | Rigging (Standing) | Sheet | Shroud | Stay mouse | Stays | Throat | Topping lift | Trapeze
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