Mast bend is the most dynamic part of mast tuning for speed.

Ac75 mainsail. Fallow explained Straight after the cup in 2017 when Emirates Team New Zealand was then establishing the new Americas Cup rules for the new boat we began brainstorming. A new evolution this Americas Cup is the twin-skin mainsail. Change to the measurement between centre to mass and centre of buoyancy.

Correction of axis to be used when measuring mast and mainsail assembly. We dont say how the skins have to come off the back of the D-Shaped mast. Underwater is where things get really interesting this Americas Cup but the story starts inside the boat.

It allows you to use one mainsail through every wind speed and point of sail by changing its depth and twist. The animation shows the behavior of our aeroelastic simulation algorithm CFD FEM as it converges to an equilibrium sail geometry and aerodynamic flow solution for the new AC75 mast mainsail. The double-sail skins combine with the spar to form a wing generating the power the AC75 needs to foil.

We caught up with Emirates Team New Zealand embedded sail designer Burns Fallow to learn more about the twin skin mainsail. This probably gives structural integrity to handle the mainsheet loads needed to control twist and provides a deck surface to endplate the mainsail. AC75 Cockpit Layouts Mainsail Differences All four AC75s have a central beam running the length of the cockpit.

Some of the factors that affect bend cannot be adjusted during a race. Ive been told that the mainsail is small enough that in most conditions the gennaker or more correctly the Code 0 will be needed to provide enough power for foiling. Now we have an independent leeward skin of the mainsail which is the most important side to get right.

A concept decided on before they had finalized the AC75 hull design. The AC75 mainsail will have a different flying shape from the IACC monohulls sailed from 1992-2007 Americas Cups class and the hard wingsails used on the AC72 and AC50 in 2013 and 2017. The most important is the position of.