Table of Contents Glossary


Force - A push or pull of one object on another, causing a change in motion. Food Chain - The path of energy in food from one object to another.


Foot - A standard customary unit of measurement in the United States. 1 foot =1/3 yard or 12 inches or .3048 meters. Gearbox - Increases speed of shaft between rotor hub and generator)


Generator - Uses rotational energy of shaft to generate electricity using electromagnetism) electrical equipment - carries electricity from generator down through tower and controls many safety elements of turbine


Gravity - The force of attraction between any two objects due to their mass.


Halyard - A line or rope that is used to hoist a sail, a flag or a yard. The term halyard comes from the phrase, ‘to haul yards’. On smaller boats the main halyard is the rope that hoists the main sail and the jib halyard is the rope that hoists the jib sail.


Habitat - The place where a plant or animal naturally grow.


Header - Sailing on a close-hauled course, a header is a shift which forces you to bear off to keep the sails full. When this happens, you will not be heading as close to the windward mark as you were.


High Speed Shaft - Transfers rotational energy from gear box to generator Hub - Where the blades connect to the Nacelle. In simple designs, the blades are directly bolted to the hub and are unable to pitch. In more sophisticated designs, the blades are bolted to the pitch mechanism, which adjusts their angle according to the wind speed to control their rotational speed. The hub is fixed to the rotor shaft which drives the generator directly or through a gearbox.


Hydrometer - The instrument used for obtaining the specific gravity of a liquid. Hypotenuse - The side of a right triangle that is opposite the right angle.


Inclined Plane - A flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The inclined plane is one of the six classical simple machines. They are widely used to move heavy loads over vertical obstacles; examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade.


Isosceles Triangle - A triangle with two equal sides.


Land Breeze - At night, the land cools off faster than the ocean due to differences in their heat capacity, which forces the dying of the daytime sea breeze. If the land cools below that of the adjacent sea surface temperature, the pressure over the water will be lower than that of the land, setting up a land breeze.


Leg 1 - The side of a right triangle that is not the hypotenuse. Leg 2 - The course and distance sailed by a boat on a single tack.


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