Oracle founder Larry Ellison takes his boat racing very seriously. His team’s entry in last year’s America’s Cup, the USA-17, is actually capable of sailing faster than the prevailing wind. And not just by a little bit — 2.5 times faster.
USA-17 is the specially built sloop rigged racing sail trimaran (a catamaran with three hulls) launched by the BMW Oracle Racing team that won the 33rd America’s Cup. It’s 27m long square at the waterline and displaces 17 tons of water. The USA -17 was designed by VPLP Yacht Design and is constructed primarily out of carbon fibre composite. This makes her exceptionally light and fast for her size. When travelling downwind with a 5-10 knot winds in last year’s America’s Cup, the USA-17 was recorded rocketing along at an astonishing 19 knots.
The hulls are constructed from millimetre-thick carbon epoxy laminated around an ultra-light honeycomb core and then baked in a vacuum chamber within a massive oven for eight hours at 80C. This results in a hull that is exceptionally strong, stiff and, most importantly, light. And it’s got to be — tight turns can generate as much as 15 tons of torque on the hull.
It’s also designed to cut through waves. The USA-17 has a very narrow bow that’s much less buoyant than the rear of the ship. This forces the hull through, rather than over, the wave which results in a smoother ride and reduces the ship’s resistance through the water.
The USA-17 is propelled by its massive 68m tall, 3493kg main wing that’s attached to a 3.5-ton carbon fibre and Kevlar mast. It’s taller than the Statue of Liberty and larger than any plane wing in existence. This airfoil works just like a plane’s wing, except that it produces horizontal thrust rather than vertical.
The amount of curve in the wing determines how much lift it produces. The mast rotates to control the angle of the wing while nine, two-storey tall trailing wing flaps can be independently angled to adjust the wing’s overall curve. These trailing wings form a slotted flap when deflected, much like the flaps on an aeroplane’s wing which produces more thrust than earlier wingmast/sail combinations. In addition, these flaps can be adjusted to maximise the lift on the wing near the base of the mast and lessening higher up to produce lots of power without a lot of heeling force (which is what causes boats to flip).
In addition, her sails — the mainsail, headsail and gennaker — have a massive combined surface area of nearly 2044sqm.
All of this design means there’re lots of parts that can break. To monitor the stresses and loads placed upon the boat as the crew trains and races, 250 sensors located throughout the hull, mast and sails, beam real-time data to a PDA on the skipper’s wrist.
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