Aspect Ratio: The ratio of span^2 to projected area for any lifting surface. This reduces to span/mean chord for trapezoidal planforms.
Bi Plane Rig : Two masts, arranged side by side, the same distance from the bow
Capsize : The boat has rolled 180 degrees to a stable, but upside down, condition
Catboat rig: A single mast, well forward, supporting one large mainsail.
CE : The Center of Effort is the centroid of a sail or sails.
CG :the center of gravity is the point where the mass or weight of a boat acts
Cutter :A single mast rig with two headsails. The second jib (stay sail) is often self tending and easy to use in strong winds.
Data Base : A tool for organizing information in three or more dimensions
Displacement: The weight of the boat as measured on dry land
Graphs :A method for visualizing information with two or, rarely, three dimensions, x = horizontal, y = vertical
Knots :Velocity, at a speed of one knot, a boat will travel one nautical mile in one hour
LOA : Length overall
Moment : The product of a force times a distance. Moments try to rotate things.
Overturning Moment : The product of the wind force times the center of effort
Pitch :rotary motion around the transverse lines ( the bow goes up and down when pitching)
Roll : rotary motion around the fore and aft lines. Sometimes called heeling
Spread : The difference in Y-axis data when the X-axis is held constant
Stable : In balance
Windward : The side facing into the wind
Yaw : rotary motion around the vertical axis ( the bow swings side to side )