Editing Depleted uranium (section)

===Sailboat keel===
[[Pen Duick|''Pen Duick VI'']], a boat designed by {{ill|André Mauric|fr}} and used for racing, was equipped with a [[keel]] of depleted uranium.<ref>"Pen Duick heading for Bass Strait" ''The Sydney Morning Herald'', 4 December 1973, [https://news.google.com/newspapers?nid=1301&dat=19731204&id=0rIpAAAAIBAJ&sjid=EeUDAAAAIBAJ&pg=755,1709736 p. 17].</ref> The benefit is that, because of the very high density of uranium, the keel could be thinner for a given weight, and so have less resistance than a normal keel. It was later replaced by a standard lead keel.<ref>{{cite web|url=http://www.volvooceanrace.com/en/news/7245_Roaring-Forties-chapter-22-Frances-inspiration.html |title=Roaring Forties, chapter 22: France's inspiration |date=19 August 2013 |work=[[Volvo Ocean Race]] |access-date=26 February 2016 |url-status=live |archive-url=https://web.archive.org/web/20130819125034/http://www.volvooceanrace.com/en/news/7245_Roaring-Forties-chapter-22-Frances-inspiration.html |archive-date=19 August 2013}}</ref>