Team Emirates sails their AC-72 Racing Yacht near The Golden Gate Bridge during a training session for the America's Cup competition in San Francisco on July 2, 2013.
Reporter: Paul Lancour
After years of buildup, the America's Cup sailing competition is officially under way on the San Francisco Bay. July Fourth was the opening ceremony, kicking off more than two months of racing. On Friday, fans will get to see a time trial featuring the very big, very expensive AC-72 boats -- catamarans that can hit speeds of 45 miles-per-hour on the water. Three boats will compete for the chance to unseat defending champion Oracle Team USA, owned by billionaire Larry Ellison.
The event hasn't been without controversy -- around the race itself, the potential cost to the city of San Francisco, and the safety of the boats designed for this year's Cup. We hear from Kimball Livingston, international sailor and blogger at Blue Planet Times.
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