Boat keel
On boats and ships, the keel is the central part. The rest of it is built around it. When a boat or ship is being built then the keel laying down is the first step and the date is noted as the start of the job. Only the launching of the ship is more important.[1]
History
Evidence of early wooden ship keels has been found around the world. In Europe, Viking longships have been found which were buried but still show their keel and the way the boat was built.[2]
The adjustable centerboard keel traces its roots to the medieval Chinese Song dynasty. Many Song Chinese junk ships had a ballasted and bilge keel that consisted of wooden beams bound together with iron hoops. Maritime technology and the technological know-how allowed Song dynasty ships to be used in naval warfare between the Southern Song Dynasty, the Jin dynasty (1115–1234), and the Mongols.[3][4][5]
Metal keels
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The most common type of keel is the "flat plate keel", and this is fitted to ocean-going ships and other vessels. A form of keel found on smaller vessels is the "bar keel", which may be fitted in trawlers, tugs, and smaller ferries.[6]
Non-sailing keels
In non-sailing boats, the keel helps the hull to move forward, rather than slipping to the side. In traditional boat building, this is provided by the keel, which comes out from the bottom of the hull. There are many types of keels, including full keels, long keels, fin keels, winged keels, bulb keels, and twin keels among other designs.
Yacht keels
The keel works by changing the sideways movement of the wind into a forward movement. It also gives weight to the boat.
Keels are different from centreboards and made of heavy materials to give weight to steady the boat. Keels may be fixed or they may lift up to allow sailing when the water is not deep. The amount of sail use is smaller when sailing with the keel up in the boat.
Other types of keels are swing keels and canting keels. Canting keels can move sideways and can be on racing yachts, such as those in the Volvo Ocean Race.
Boat Keel Media
The flag map of the six Yugoslav republics (without the two autonomous provinces) between 1945 and 1992
The distribution of ethnic Serbs in Croatia, Bosnia, and Serbia in 1981 (delineated with the Serbian tricolor)
Ambushed JNA tanks near Nova Gorica, on the border with Italy
Damage after the bombing of Dubrovnik
A destroyed Serbian house in Sunja, Croatia. Most Serbs fled during Operation Storm in 1995.
People queueing to gather water during the Siege of Sarajevo, 1992
Former Yugoslavia during war front lines in 1992 - Flag map of yugoslav wars
A Tomahawk cruise missile launches from the aft missile deck of the US warship USS Gonzalez on March 31, 1999
Smoke rising in Novi Sad, Serbia after NATO bombardment in 1999
The skull of a victim of the July 1995 Srebrenica massacre in an exhumed mass grave outside Potočari, 2007
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References
- ↑ Three Industry Giants Lay Keel for 62m Project. Retrieved 2019-07-07. George Bains, Superyachts. June 28 2019
- ↑ Enormous, rare Viking ship burial discovered by radar. Andrew Surry, National Geographic. October 15 2018
- ↑ Teng, Jimmy. Musket, Map and Money:: How Military Technology Shaped Geopolitics and Economics (2014)Walter de Gruyter. p. 117. ISBN 978-83-7656-058-8.
- ↑ Clancey, Gregory K.. Historical Perspectives on East Asian Science, Technology and Medicine (2002)World Scientific Publishing. p. 498. ISBN 978-9971-69-259-9.
- ↑ Deng, Gang. Maritime Sector, Institutions, and Sea Power of Premodern China (1999)Praeger. p. 9. ISBN 978-0-313-30712-6.
- ↑ Ship/boat Keel Market. Retrieved 2019-07-07. S. Shana, Insiders Tribune. July 2 2019