Draft (sail)

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In nautical parlance, the draft or draught of a sail is a degree of curvature in a horizontal cross-section. Any sail experiences a force from the prevailing wind just because it impedes the air's passage. A sail with draft also functions as an airfoil when set at an angle slightly greater than the angle of the wind, producing lift which then propels.

The word "belly" is also used in reference to the draft of a sail (i.e. "More belly in the main sail.").

References

v t e Sails, spars and rigging

Rigs	Bermuda rig Cat rig Full rig Gaff rig Junk rig Ljungstrom rig Mast aft rig

Sail types	Asymmetrical spinnaker Junk sail Lugsail Parafoil Ringtail Spinnaker Turbosail Rotorsail Wingsail

Sails (sail plan)	Course Crab claw Driver Extra Fisherman Genoa Gennaker Jib Lateen Mainsail Moonraker Royal Skysail Screecher Spanker Spinnaker Spritsail Staysail Studding Topgallant Topsail Trysail Watersail

Sail anatomy and materials	Clew Foot Head Leech Luff Roach Tack Throat Peak Dacron Technora Kevlar Twaron

Spars	Boom Bowsprit Boomkin Dolphin striker a/k/a Martingale Pelican striker Fore-mast Gaff Jackstaff Jibboom Jigger-mast Jury rig Main-mast Mast Mizzen-mast Truck Spinnaker pole Spreader Sprit Topmast Yard

Rigging components	Backstay Block Boomkicker Braces Buntlines Chainplates Cleat Clevis pin Clewlines Cunningham Downhaul Earing Fairlead Forestay Gasket Gooseneck Gunter Guy Halyard Kicker Lazy jack Outhaul Parrel beads Peak Preventer Ratlines Running rigging Shackle Spinnaker chute Standing rigging Sheet Shroud Stay mouse Stays Throat Topping lift Trapeze Traveller Turnbuckle Vang Windex

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