The double-sail skins combine with the spar to form a wing generating the power the AC75 needs to foil.

Ac75 mainsail control. 51 - Mainsail Trim. Mainsails must perform over a wide variety of sailing conditions. AC75 class boats are powered by both human energy and battery power.

The gantry at the top of the mast can help control twist but twist will mainly be controlled by leech tension and leech lines the leech is the trailing edge of the sail. There is no heavy keel to help keep it upright like a traditional sailboat. Mast bend is the most dynamic part of mast tuning for speed.

The concept being tested currently has a large D shaped section mast developed and built by Southern Spars with separate mainsails on either side of the mast providing a smooth transition from the mast to sail in its aerodynamic shape. As with everything on the AC75 the mainsail is a. The mainsail can be adjusted to vary the amount and location of draft and trimmed to control the shape of the leech and its angle to the wind.

1 Introduction 11 This document defines the rules that govern an AC75 Class Yacht the class of yacht chosen. Hamburg January 4th 2020 AC75 INTERPRETATION 072 33 conflict with requirement to comply with the layout mandated in the rig plan so any control of the running backstays therefore is required to be consistent with this layout as well as the configuration. The AC75 class rules that control all the components of the sail plan have the same mixed approach as the rest of the boat.

Whilst the batteries control the main foils and rudders everything above the waterline including every sail control is powered by the onboard grinders using pedestals supplied by official Winch. 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. Team New Zealand has done some tests of a double luff mainsail.

The Sails of the Americas Cup. The most important is the position of. In addition to conventional mainsail trimming controls this concept allows for twist and camber control at the head of the mainsail through a.