Each foil arm is attached to the hull with wings and flaps positioned on its extremities.

Ac75 wing sail. Several wing shapes were developed for these boats and each team chose the design that best suited the features of the hull and the crews sailing style. The wings of the AC75 yachts are made of lead to ensure density and weight and steel an excellent material for structural solidity. The boat feels the new wind generated by its own speed.

The AC75 crews might be sailing in only 18 knots. Underwater is where things get really interesting this Americas Cup but the story starts inside the boat. Burns Fallow and Michael Richelsen led the collaboration between North Sails Americas Cup defender Emirates Team New Zealand and Challenger of Record Luna Rossa to develop the soft wing concept and AC75 Class Rule.

Both North Sails and. The physics of a foiling AC75 are as simple as they are complex but envision a large windsurfing board with towering sails. Joop Slooff author of The Science behind Sailing and Australia II and the.

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. The sailing world awaits with bated breath the first reveal of a second generation Americas Cup AC75. The foils of the Americas Cup.

Underwater is where things get really interesting this Americas Cup but the story starts inside the boat. 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. The foil cant system is brand new technology - a battery-driven.

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. Published on December 6th 2020. Americas Cup Second generation AC75 waiting in the wings.