18th man

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America's Cup yachts (up to the 32nd AC, IACC class) are crewed by 17 individuals. These boats must carry what is known as the 18th man, a passenger or the equivalent weight up to 100 kg. This is a highly sought-after position, often filled by a celebrity or a representative from one of the key sponsors to the team.

[edit] References

http://www.americascup.com/en/acmag/letter/index.php?idIndex=0&idContent=3541

http://www.ft.com/cms/s/2/40d44868-0142-11dc-8b8c-000b5df10621.html