This has the effect of creating a.

Ac75 mainsail. LF Herreshoff was the son of Nathanael Herreshoff and despite the famous father his designs never won an Americas Cup. It allows you to use one mainsail through every wind speed and point of sail by changing its depth and twist. Latest AC75 Class Rule version.

AC75 Cockpit Layouts Mainsail Differences All four AC75s have a central beam running the length of the cockpit. Underwater is where things get really interesting this Americas Cup but the story starts inside the boat. A new evolution this Americas Cup is the twin-skin mainsail.

OUT are the semi-rigid 23 metre wings that were used on the 50 ACC catamarans IN are the new double-skinned mainsails that are now raised and lowered 26m to the top of the mast. Here is the sail plan with dimensions. Centreline T foil.

The most important is the position of. 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 mainsail trimmer controls the three-dimensional shape of the mast and the mainsail.

We caught up with Emirates Team New Zealand embedded sail designer Burns Fallow to learn more about the twin skin mainsail. A concept decided on before they had finalized the AC75 hull design. It consists of two mainsails which are attached to both corners of a D-shaped mast tube.

Mast bend is the most dynamic part of mast tuning for speed. So the AC75 is potentially a little underpowered relative to its righting moment. The leeward skin is more curved and therefore the leech is further forward.