Between 32 and 50 knots one knot 1 mile per hour 1852m per hour.

Ac75 upwind. Publish Date Sat 12 Dec 2020 449PM Emirates Team New ZealandPhotosport. Now the AC75 has passed its first test as a class in the opening and only Americas Cup World Series regatta which concluded less that two weeks ago some of the top sailors in the new class share their views on the foiling monohull. The fifth yacht planned from the American Stars Stripes challenge has not yet been built and already the challengers and the defender are working on their second yacht which should be launched next summer for the first ones.

The two Challengers charged up the course at. The two Challengers charged up the course at. Americas Cup AC72 True Vs Apparent Wind Upwind.

The big difference is at higher wind speeds. In 10 kts of wind the AC50s sailed 22 - 27 kts upwind which is about the same I got for the AC75 but at 45 deg TWA. But the Kiwi boat goes upwind with a slightly higher VMG.

Luna Rossa earned the first cross but the race soon turned in favor of American Magic. So when an AC75 is sailing upwind in 18 knots of breeze at a boatspeed of 40 knots the crew on deck will be experiencing 40 knots of wind over the decks plus a percentage of the true wind speed. I found two preliminary races sailed in 20 kts.

Downwind in 10 kts of wind both the AC50 and AC75 sail around 28 - 32 kts. When some observers realized that the next Cup monohulls would fly they thought that only the foils would be decisive. Not the case in the 36th Americas Cup wherein in this new age of the AC75 foiling monohull the little Cunningham has a big job.

It takes some serious power or sail depth to lift the 65-tonne AC75 out of the water. Initially the AC75 needs massive depth in its mainsail to generate power for lift-off. On trimming the AC75s Twin-Skin Main.