The Emirates Team New Zealand and Luna Rossa design teams have unveiled the AC75 a concept design for the 36th Americas Cup in 2021The design is a 75 foot long foiling monohull.

Ac75 keel. Its also different rather than a keel a. The design uses the righting forces generated by the canting port and starboard foils for stability as well as to lift the boat out of the water at speed. The rig height for the length of the AC75 is very short.

That will be a critical part of the AC75 and not all of it will be visible to the casual observer. While designing the lines of TNZ Te Aihe we noticed that the AC75 rule was radically different from the rules that are in use in France for Open Mini Transat Open 40 or IMOCA mono-hulls. We dont really need a lot of heeling moment and therefore you can get away with a short rig.

Emirates Team New Zealand revealed its second generation AC75 to the world at its base in Aucklands Viaduct on Thursday. The AC75 crews might be sailing in only 18 knots of breeze. Hulls 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.

The AC75 will not have a keel. In the normal sailing mode the AC75 will skim above the waves on the leeward foil and rudder with the windward foil raised out of the water to reduce drag. Instead of a keel it has two canting ballasted T-foils to provide righting moment and the ability to self-right the boat in the event of a capsize.

When Luna Rossa heels its bottom is close to horizontal but its keel must induce some distortions in the water lines. Its also different rather than a keel a brand new concept keeps it standing. The deck is slightly recessed to gain sail area favor the wind acceleration in the lower part of the sails and increase the.

The AC75 will replace the AC50 a 50-foot foiling catamaran used in the 35th Americas Cup earlier this year in Bermuda. Foil Cant Arms move under or outside the. The single most radical development of the AC75 is to take a 75ft keelboat but put no keel on it whatsoever.