In sailing and boating, freeboard means the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. In commercial vessels, the later criteria measured relative to the Ship's load line, regardless of deck arrangements is the mandated and regulated meaning.
In yachts, a low freeboard is often found on racing boats, for weight reduction and therefore increased speed. A higher freeboard will give more room in the cabin, but will increase weight and may compromise speed. A higher freeboard also helps weather waves and reduce the likelihood of green seas on the weather deck. A low freeboard boat is susceptible to swamping in rough seas. Freighter ships and warships use high-freeboard designs to increase internal volume and also allowing them to satisfy IMO damage stability regulations due to increased reserved buoyancy.
Contract Awards: $11.94 Million Federal Contract to Cascade General by U.S. Navy for Tanks, Hulls, Freeboards Repair
Jan 10, 2009; BREMERTON, Wash., Jan. 12 -- The U.S. Navy has awarded a $11.94 million federal contract to Cascade General Inc., Portland, Ore.,...
Time-invariant sea-floor depths: using the ellipsoid as zero-reference surface; A GPS survey combined with acoustic soundings can determine highly accurate sea-floor depths. Using the ellipsoid as the zero-reference surface then allows navigators, while underway, to determine both keel and overhead obstruction clearance independent of the stage of the tide and the draft of the ship and freeboard.(DESIGN CHALLENGE)
Sep 01, 2005; For safe sailing, two most important requirements are to be able to determine clearances between the sea floor and the keel of...