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Such records are set by sailing an average speed over the course of m, usually over a perfectly straight, flat course in optimum conditions. Perhaps even more impressive, in the right conditions when racing we have seen some boats managing 40 knots of boatspeed upwind in around 17 knots of wind.
That is simply unheard of in performance terms and almost unimaginable just three or so years ago. Related to the speeds the boats are sailing through the water, particularly upwind, is the wind speeds the sailors will feel on deck.
When sailing, the forward motion affects the wind we experience onboard, known as apparent wind. Roll down the window and stick your hand out of it and there will be 50mph of wind hitting your hand from the direction your car is travelling. The teams are there, the boats are there, and finally after two months of AC75 racing in Auckland, for the�. So when an AC75 is sailing upwind in 18 knots of breeze at a boatspeed of 40 knots, the crew on deck will be experiencing 40 knots of wind over the decks plus a percentage of the true wind speed � depending on their angle to the wind.
The AC75 crews might be sailing in only 18 knots of breeze � what would feel like a decent summer breeze on any other boat � but they experience winds of around 50 knots. To put that into context, that is a storm force 10 on the Beaufort scale! Once up on the foil, everything to windward of the leeward foil generates righting moment. By doing away with the keel entirely, the design is now like nothing we have ever seen, particularly when it comes to how dynamic the power transition is between foiling and not foiling.
The boats are designed to foil on the leeward foil, with the windward one raised to help increase righting moment: to help balance the boat. This means that when the AC75 is not foiling they are extremely tippy � much more so than most other boats of the same size. Essentially, when the wind catches the sails, the boat wants to fall over as there is too much sail area for the amount of weight underneath the boat � something a lead keel usually counters on a yacht or keelboat.
Once the boat is up and on the foils, however, that all changes, as everything to windward of the single foil in the water balances the sails. That means, the hull, the crew weight, the sail and rig weight, and the windward foil, all work to counter the sails.
What all this means is that the boats go from being extremely tippy, to hugely powerful in just the few seconds it takes to get up on the foil. Then immediately [once they lift off] you have more stability than, well, take your pick, but certainly more righting moment than something like a Volvo 70 with a big canting keel.
With lift created to windward by the foils, it is possible that the boats can sail diagonally to windward. With the AC75 sailing on its foil, drag is dramatically reduced, vast amounts of power can be generated and so speeds rapidly increase. But the foils can serve another purpose too. In order to be able to lift each foil out of the water, the foil arms must be able to be raised and lowered.
The further out the leeward foil arm is canted � essentially more raised � the closer the AC75 flies to surface and, crucially, the more righting moment is generated as the hull and rest of the boat gets further from the lifting surface of the foil. There is another positive to this: as the lifting foil is angled, it produces lift to windward, which can force the boat more towards the wind than the angle it is sailing.
As the foils work to provide stability to the boat when it is stationary both foils are dropped all the way down to stop it tipping over and to provide massive amounts of righting moment, they are incredibly heavy. A pair of foil wings and flaps excluding the one-design foil arm which attaches them to the boat and lifts them up and down weigh kg. To put that into perspective, the entire boat itself with all equipment but without the crew weighs between kg and kg. Sign in to access your Outlook, Hotmail or Live email account.
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