BBC Sport - America's Cup 2017: Spying and flying - the secrets behind the boats

Spying and flying - The secrets behind an America's Cup boat

How fast do America's Cup boats travel and how do teams use spying to get ahead of their rivals? BBC Sport's Natalie Pirks takes a look at what goes into a designing and powering a winning boat.

READ MORE: America's Cup guide, schedule and BBC coverage

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