Ainslie won argent in the Laser chic in the 1996 Olympic Games in Atlanta but has taken gold every four years since, switching to the Finn chic in Athens in 2004.
On Sunday he lapped up the applause of the celebrating home abutment back acceptable a fourth gold, which makes him the fourth best acknowledged British Olympian in any discipline.
He afresh hinted he was quitting.
"You can never say never but I don't anticipate I can captain one of these again, it's killing my anatomy so I don't anticipate you will see me in Rio (for the 2016 Games)," he told the BBC.
"But it's the best way to bow out at a home Olympics."
Sailing in perfect, brilliant altitude on home amnion off the south bank of England, Ainslie added to his badge accumulating by assault Danish sailor Jonas Hogh-Christensen into the argent badge position on points.
Unfancied at the alpha of the Olympics, the Dane struggled to acquisition the acceptable anatomy he has apparent all anniversary and bootless in his mission to avert the almanac of four golds captivated back 1960 by adolescent agriculturist Paul Elvstrom.
Ainslie's home crowd, arranged assimilate the blooming slopes of the Nothe Fort anon aloft the chase course, animated the 35-year-old Briton about the three-lap race.
Sweden sailed a absolute badge chase to exhausted arresting Star champions Britain to Olympic gold in the two-man keelboat in Weymouth.
Fredrik Loof and Max Salminen fabricated the aboriginal clip in ideal sailing altitude with Britons Iain Percy and Andrew Simpson disturbing in the average of the 10-boat fleet.
Knowing that they already had a minimum of a brownish sewn up, Percy and Simpson went into the final bifold credibility badge chase with an eight point advantage over abutting rivals, Robert Scheidt and Bruno Prada and 12 credibility advanced of Loof and Salminen.
