Freeboard
From Wikipedia, the free encyclopedia
The term "freeboard" has multiple meanings, depending on the subject area.
In sailing and boating, freeboard[1] means the distance from the waterline to the upper deck level, measured at the lowest point where water can enter the boat or ship.
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.
There are other various meanings of freeboard:
- Freeboard is also used to describe the height of an ice floe above the water surface. Freeboard does not include the potential snow coverage on the ice floe.
- Freeboard in water channel design is the distance from the water level to the top of the channel's sides.
[edit] Notes
[edit] References
- Hayler, William B.; Keever, John M. (2003). American Merchant Seaman's Manual. Cornell Maritime Pr. ISBN 0-87033-549-9.
- Turpin, Edward A.; McEwen, William A. (1980). Merchant Marine Officers' Handbook, 4th, Centreville, MD: Cornell Maritime Press. ISBN 0-87038-056-X.
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