Oracle BMW Racing is using winglets at the rear of the keel bulb of USA-76.
The boat's hull was unveiled this morning.
Oracle's head of design, New Zealander Bruce Farr, said the team had ended up with a "heavily refined, fairly conventional boat".
USA-76 was narrower than most of the other boats, including Alinghi, that had entered the competition.
"Oracle has a more detailed keel and hull arrangement than Alinghi," Farr said.
Oracle unveils 'refined but conventional' design
Oracle team profile
nzherald.co.nz/americascup
Racing schedule, results and standings
<i>Picture:</i> Keel bulb of USA-76
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