What is Boat keel?
{{complex|date=December 2023}} 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.<ref>{{cite web|url=https://www.superyachts.com/news/three-industry-giants-lay-keel-for-62m-project-10813.htm|title=Three Industry Giants Lay Keel for 62m Project|access-date=2019-07-07|archive-date=2019-07-07|archive-url=https://web.archive.org/web/20190707105737/https://www.superyachts.com/news/three-industry-giants-lay-keel-for-62m-project-10813.htm|url-status=deviated|archivedate=2019-07-07|archiveurl=https://web.archive.org/web/20190707105737/https://www.superyachts.com/news/three-industry-giants-lay-keel-for-62m-project-10813.htm}} George Bains, Superyachts. June 28 2019</ref> ==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.<ref>{{cite web|url=https://www.nationalgeographic.com/culture/2018/10/viking-ship-discovered-norway-archaeology/|title=Enormous, rare Viking ship burial discovered by radar}} Andrew Surry, National Geographic. October 15 2018</ref> 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.<ref>{{cite book| last = Teng| first = Jimmy| title = Musket, Map and Money:: How Military Technology Shaped Geopolitics and Economics| year = 2014| publisher = Walter de Gruyter| isbn = 978-83-7656-058-8| page = 117 }}</ref><ref>{{cite book| last1 = Clancey| first1 = Gregory K.| last2 = Loy| first2 = Hui-chieh| title = His