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Yacht Design: Design Links/Articles

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Articles on Boat Design


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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 )

The Landing School