Americas Cup sail designer Burns Fallow reveals to Toby Heppell how the soft wing sail concept will work for the new AC75 foiling monohulls After Emirates Team New Zealand took back the Americas Cup in Bermuda in 2017 team CEO Grant Dalton was clear that.

Ac75 sails. The twin skin. The Americas Cup has developed beyond just a. As explained in the article a year ago the hull of an AC75 in foiling mode should have zero lift zero heel and.

A new evolution this Americas Cup is the twin-skin mainsail. The mast on the AC75 is a lot shorter than the AC72 but generally we are around half the weight of what the AC72 wingsail was - including mast sail and rigging he says. The core of the AC75s sail plan is the rotating soft-wing sail comprised of two sailsor skinsof a double-sided mainsail that must be attached to each of the two aft edges of a D.

There are three major ingredients to the secrets of this sea monster - the hull the sails and the foils. AC75 class boats are powered by both human energy and battery power. The AC75 rule crafted for the upcoming 36th Americas Cup was intended to be open to multiple interpretations and the result has been four very different designs.

Coupled with the fact the AC75 is unlike any other boat that has ever come before the current Cup cycle is fast proving to be as much a battle of the designers as a contest on the water. Sails There have hardly been any comments in the media about the sails. Underwater is where things get really interesting this Americas Cup but the story starts inside the boat.

Sails remain the engine of the Americas Cup yacht but with the AC75 the powertrain is more complex than ever. North Sails Director of Design. The double-sail skins combine with the spar to form a wing generating the power the AC75 needs to foil.

The AC75 is the bold new high performance fully foiling monohull. A Sail Skin is a thin and predominantly flexible membrane of a headsail including Code Zero or mainsail In other words the rule intends that a. Of course the double skinned mainsail doesnt generate the power of the hard wingsail of the AC72.