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The boats can typically travel at speeds over 80 knots (150 km/h) in calm waters, over 50 knots (90 km/h) in choppy waters, and maintain 25 knots (47 km/h) in the average five to seven foot (1.5 to 2 m) Caribbean seas. They are heavy enough to cut through higher waves, although at a slower pace.
A displacement boats theoretical hull speed is when the wave length is equal to the waterline length. The important thing here is the length of the wave is relative to the length of the boat. The SL Ratio is a simple formula for calculating displacement boats speed which is typically 1.34. Velocity = (g * Length / 2 pi) ^ Â½. g = acceleration of gravity (32.15 ft/sec ^2) Convert ft./sec. to Knots and the result is 1.34 * L^Â½.