They are almost always used if the Leech of the sail has a pronounced Roach. Battens Flexible stiffening used to help maintain the shape of a sail. Baggywrinkle Chafing gear usually placed on a spar or rigging to protect sails from damage from rubbing against them. High narrow sails will have a higher first number while short wide sails such as sprit or lugs will have smaller first number. If a sail is 14 feet high and 7 feet wide it has an aspect ratio of 2:1 expressed as "two to one". Aspect Ratio The ratio of the height against the width. The component of this force perpendicular to the direction of motion is called lift. Test your knowledge with my Sail Quiz Sail Words Defined Airfoil Or more accurately just FOIL The shape of a Sail or daggerboard or wing or blade (of a propeller, rotor or turbine) or as seen in cross-section.Īn airfoil-shaped body moved through a fluid such as water and produces a force. Many beginning boat builders and not so novice find sail terminology confusing, you are not alone. The drawings are mine, I'm not a terrific illustrator. I'm hoping here to include the most important terms used to describe sails and sailing and to make it easier for folks who are trying to read and are getting bogged down with the terminology. If you want me to add another word, just send me an email and I'll add it. If you plan to do any reading on sails and sailing you will need to know these sail terms or at least where to find the meanings. Here is the result of my research on sail terminology Nautical terminology is confusing for not-so-salty boatbuilders and sailors.
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