The physics of a foiling AC75 are as simple as they are complex but envision a large windsurfing board with towering sails.

Ac75 wing sail. As established by the rule each team was allowed to. The AC75 will have a double luffed mainsail - to try to achieve some of the efficiency of the wing but using a hoistable soft sail. The foils of the Americas Cup.

Collaboration On The Soft Wing Concept And AC75 Class Rule. The AC75 crews might be sailing in only 18 knots. A sail is never going to be as efficient as a wing with a slot between that reattaches flow so its never going to be quite as powerful as a wing.

Burns and Michael focused on adapting the North Design Suite most. Americas Cup Second generation AC75 waiting in the wings. The sailing world awaits with bated breath the first reveal of a second generation Americas Cup AC75.

So same on a boat. Here is the sail plan with dimensions. For 2021 there is the two-pronged challenge of developing the AC75 monohull foiling concept along with the two-skinned soft mainsail writing a Class Rule and then designing a race boat for the Defence.

So the AC75 is potentially a little. While the foil arm is a one-design element identical for all boats the wings and flaps can be developed by each team according to a box rule. Unless it is stopped dead in the water a boat will never feel the actual true wind.

The wind that the car feels is the shifted wind called the apparent wind. Underwater is where things get really interesting this Americas Cup but the story starts inside the boat. Joop Slooff author of The Science behind Sailing and Australia II and the.