Freeboard, in
sailing and
boating, means the distance from the
waterline to the upper
deck level, measured at the lowest point where water can enter the
boat or
ship. A low freeboard is often found on
racing boats, for speed. A higher freeboard will give more room in the
cabin, but may compromise speed. A higher freeboard also helps prevent water from getting into a boat. A low freeboard boat is susceptible to swamping in rough seas. Freighter ships and
warships use high-freeboard designs which improve seakeeping and stability, especially
aircraft carriers, which must be as stable as possible to provide a good aviation platform.
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1. Vertical distance from the normal water surface to the top of a confining wall. 2. Vertical distance from the sand surface to the underside of a trough in a sand filter.
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