The America's Cup was on display at the Greenwich Maritime Museum in London, as the Duchess met with supporters of Sir Ben Ainslie's bid to launch a British team to take part in the competition.
Olympic sailor Ben Ainslie is seeking to enter a British team in the 35th America's Cup, to be held in 2017.
The oldest trophy in sport was first offered as the One Hundred Pound Cup in 1851 for a race around the Isle of Wight, witnessed by Queen Victoria.
The first race was won by the schooner America, from New York, which beat a fleet of British boats sailing around the island.
American teams successfully defended all challenges for 132 years, until an Australian team won in 1983.
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.