The top four metres is known as the Upper Zone and the bottom 15metres is the Lower Zone.

Ac75 displacement. The AC75 Class rule is very exciting because the design space is really open and theres a lot of time spent at the engineering stage to cater for. On their blank sheet of paper or rather their monitors they started from a rather basic box rule with a hull length of 2070 meters a maximum beam of 5 m a displacement of 76 tons. It makes the transition from displacement to flying harder than a multihull.

After 18 months of heavy secrecy shrouding anything to do with the AC75s the 75 foot foiling monohull is quickly becoming an open affair with two new boats unveiled last week less than 48 hours apart. In mere seconds the AC75 goes from low-speed displacement sailing in as little as 10 knots apparent wind speed to high-speed foiling in excess of 50 knots apparent wind speed. As explained in the article a year ago the hull of an AC75 in foiling mode should have zero lift zero heel and almost zero distance between the bottom of the hull and the water surface.

AC75 Class Rule 1210 Proposed amendment. Each design team started from a simple box rule with a hull length of 2070 meters a maximum beam of 5 meters a displacement of 76 tons of which there are two weighted foils of 1215 kg each. It will be a displacement monohull that is good for traditional match racing.

Suggesting the Kiwis believe there is a well defined step between displacement sailing. On November 20th of the same year after debates between potential designers the concept of this monohull - the AC75 - was revealed. It will be somewhere between 80 and 100 feet in length.

The AC75 Americas Cup 75 is a racing yacht used in the 2021 Americas Cup match and planned to be used for the 37th Americas Cup and 38th Americas Cup matches. As with the AC72 the vexed issue with the Code Zero is that in displacement mode the Extra is required in marginal conditions to get the AC75 up to foiling speed but once the AC75 is up and foiling the sail is an impediment as the apparent wind comes forward very. Amazing the difference in the architectural solutions chosen by the design teams for the first four ac75s launched recently.

This is my ninth Americas Cup and the nature of the game is always to push a bit further with every cycle says Marie. The visually diverting aspect of the AC75 is the foil each side which will serve alternately as a hydrofoil generating lift and as a lever producing righting moment. The 23 m 75 ft monohulls featured wing-like sailing hydrofoils mounted under the hull a soft wingsail and no keel.