Throughout the race the teams will constantly adapt their sail plan up and down the apparent wind range.

Ac75 wind range. Sail area upwind with Solent. While a knot here or there may seem of little relevance to competitors in more mainstream sailing competitions the arguments over the Americas Cup race conditions speak to the incredible focus on design optimisation for the AC75 racing yachts. As with all foiling boats getting on the foils and staying there in the wind range set for the event is key to winning.

This is obviously more difficult at the light end of the wind range. 135-145sqm mainsail 90sqm jib 200sqm code zero. 207m plus 2m bowsprit.

Thousands of simulations to learn to sail an AC75. Mainsailsoft wing 145m2 - jib 80m2 - code zero 180m2. The AC75 design rule is a so-called box rule which sets some key parameters such as hull length and overall length with bowsprit 75ft.

The upper limits were set to be increased from 21 knots to 23 knots for both of the prestige events of the. The AC75 class being used in the 36th Americas Cup introduced the first foiling monohull design to the event. 75 feet 2286m.

Raw performance seems to be there for the AC75s speed wise reaching 50knots but the actual challenge will be course racing in any conditions. Immediately behind Te Aihe there is a tideline of rougher water as the outgoing tide is forced around a large sandspit off Cheltenham at low tide the sandy area shown just below the surface dries out and you can walk and then wade in the area behind the AC75 at this point. With the AC75 the righting moment stays constant as you go through the windspeed range - so in the mid-windspeed range once you are foiling in 9-15kts of breeze there is definitely the potential to be quicker than an AC50.

Depending on the course of the day there are many vantage points around. To get around this same issue in the 2017 Americas Cup with the AC50s a time limit of 10 minutes applied for Leg 2 the first downwind leg of the race. Yesterday AC75 race was painful to watch although the AC75 concept did work and look like weapons main issue as noted first day was light wind perf range.