The 'Star' is a 6.9 metres (23 ft) one-design racing keelboat for two people designed by Francis Sweisguth in 1910. The 'Star' was an Olympic keelboat class from 1932 through to 2012, the last year keelboats appeared at the Summer Olympics.

It is sloop-rigged, with a mainsail larger in proportional size than any other boat of its length. Unlike most modern racing boats, it does not use a spinnaker when sailing downwind. Instead, when running downwind a whisker pole is used to hold the jib out to windward for correct wind flow. Early 'Stars' were built from wood, but modern boats are generally made of fiberglass.

The boat must weigh at least 671 kg (1,479 lb) with a maximum total sail area of 26.5 m2 (285 sq ft). The 'Star' class pioneered an unusual circular boom vang track, which allows the vang to effectively hold the boom down even when the boom is turned far outboard on a downwind run. Another notable aspect of 'Star' sailing is the extreme hiking position adopted by the crew and at times the helmsman, who normally use a harness to help hang low off the windward side of the boat with only their lower legs inside.

The 'Star' was added to the Olympic roster for the 1932 Summer Olympics in Los Angeles. Due to World War II, there were no Olympic games held in 1940 or 1944, and for 1976, the Star was replaced by the Tempest for keelboat competition. In 2011, the decision was made to remove keelboats from sailing at the 2016 Summer Olympics in Rio de Janeiro.

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