Table of Contents Glossary


change the direction of a line. A ratchet block turns freely when a line is pulled in one direction but does not turn the other direction, although the line may slip past the sheave. This kind of block makes a loaded line easier to hold by hand, and is sometimes used on smaller boats for lines like main and jib sheets that are frequently adjusted.


Buoyancy - The upward force exerted on an object by the surrounding fluid (in most case water) in which the object is immersed. Buoyancy acts against the force of gravity.


Center of Gravity - The point on your boat where all the mass would be concentrated if it had to be compressed to a single point. For a boat to float properly on it’s designed waterline, then the Center of Gravity must be in line vertically with the Center of Buoyancy.


Complementary Angles - Two Angles are Complementary if they add up to 90 degrees (a Right Angle). They don’t have to be next to each other, just so long as the total is 90 degrees. are angles whose measures sum to 90°. If the two complementary angles are adjacent (have a common vertex and share just one side) their non-shared sides form a right angle.


Compound Pulley - A compound pulley system uses a fixed pulley and a movable pulley so that an operator is able to move a heavy load with less physical effort. The multiple pulley system is able to multiply the strength and pulling power of the winch, lowering the strain on the winch and the object being pulled. Such a system can be found on many heavy lifting cranes and overhead winching machines. The block and tackle is also a type of compound system.


Current - A body of water or air moving in a definite direction, through a surrounding body of water or air in which there is less movement.


Debris - The remains of something broken or destroyed.


Decomposition - (decompose) The breakdown or decay of organic matter through the digestive process of microorganisms, macroinvertebrates and scavengers. Density - The mass per unit volume of an object. Density = Mass/Volume Displacement - The moving of something by something else taking its place. Drag - The resistance to the movement of a hull through the water.


Environmental Impact - The affect something has on the environment. Major current environmental issues may include climate change, pollution, environmental degradation, and resource depletion. Explore - To systematically investigate to gather more information on which to base future decisions. Expedition - A journey or exploration undertaken for a specific reason. Fish Kill - The sudden destruction of large quantities of fish, as by pollution.


Fixed Pulley - A fixed pulley has an axle mounted in bearings attached to a supporting structure. A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference. Mechanical advantage is gained by combining a fixed pulley with a movable pulley or another fixed pulley of a different diameter.


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