Table of Contents Glossary


Leech - The after edge of a fore and aft sail. Lever - A simple machine made of a rigid bar and a fixed.


Lift - A lift is a wind shift that allows your boat to head up toward the windward mark more. It “lifts” your course higher when sailing close-hauled to a windward mark or point. Load - A weight or mass that is being lifted or moved.


Low Speed Shaft - Transfers rotational from hub to gear box. Luff - The front or leading edge of a sail.


Marine Debris - Any persistent solid material that is manufactured or processed and directly or indirectly, intentionally or unintentionally, disposed of or abandoned into the aquatic environment. Mass - The quantity of matter in an object. Mechanical Advantage - The advantage gained in using a mechanism to transfer force.


Mixture - A physical combination of two or more substances that are blended together without forming a new substance.


Miles per Hour - A standard unit of speed expressing the number of statute miles covered in one hour. It is currently the standard unit used for speed limits, and to express speeds generally, on roads in the United Kingdom and the United States. It is also often used to express the speed of delivery of a ball in various sporting events, such as cricket, tennis, and baseball. A common abbreviation is mph or MPH.


Movable Pulley - A movable pulley has an axle in a movable block. A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two.


Nacelle - Casing that holds the gearbox, generator, and shafts.


No Go Zone - Sailboats cannot sail directly into the wind, or on a course that is too close to the direc- tion from which the wind is blowing. The range of directions into which a boat cannot sail is called the no-go zone. Its width depends on the design of the boat, its rig, and its sails, as well as on the wind strength and the sea state. Depending on the boat and the conditions, the no-go zone may be from 30 to 50 degrees either side of the wind, a 60 to 100 degree area centered on the wind direction.


Over-Rotate - When the boat tacks at an angle greater than 90 degrees from their previous close-hauled course. When sailing upwind a sailor will need to tack across the wind to continue to points windward.


pH - A classification of acid or base materials on a scale of 0-14, with 7 representing neutrality; numbers less than 7 indicate increasing acidity, and numbers greater than 7 indicate increasing alkalinity (basic conditions).


Perimeter - The perimeter of any polygon is the sum of the lengths of all the sides. Polygon - A plane figure with at least three straight sides and angles, and typically five or more.


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