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Keel

Wing-shaped steel foil mounted under the middle of the boat enabling the boat to be sailed against the wind and preventing drift and capsize.

Kicking strap (kicker)

Attached between the base of the mast and the boom, helping to hold the boom down when sailing off the wind. See also Vang.

Knot

Measurement of speed, based on the time it takes to cover one minute of latitude, measured at the equator, 6,075ft, 1,852m. A knot is a nautical mile an hour, so do not use the term knots per hour