The result was the axis of the vortex was aligned with the apparent wind vector.

Ac75 upwind speed. Downwind the AC50s sailed at around 40 kts and the AC75s should be in the mid 40s. The two Challengers charged up the course at nearly 40 knots. Upwind they did about 27 - 28 kts and the AC75s will easily do 33 - 35 kts at 43 - 45 deg TWA.

Both boats sailed the first beat in 15 to 20 knots of breeze and the day was a showcase of the immense upwind performance of the AC75 class. On these yachts the apparent wind is on the order of 15 - 20 degrees upwind and down. Ad Speed - Play Now For Free Online In Your Browser.

Instead of a keel it has two canting ballasted T-foils to provide righting moment and the ability to self-right the boat in the event of a capsize. If you want to know what its like sailing at 15-20 knots upwind doing 35-40 knots you could stand on the seat of the car and stick your head out the sunroof going up the motorway at 100 or. Peter Burling blown away by the upwind speed of the AC75s.

The speeds of the AC75s are quite impressive especially upwind and the performance levels of the boats have gone beyond what the designers believed they could go Sometimes we are 6-10 knots faster upwind than with the AC50. Ad Speed - Play Now For Free Online In Your Browser. The new AC75 will be a fully flying monohull.

Upwind the AC75 will need to build speed by coming off its optimal VMG upwind course for some time and may have to sail a reaching course to some degree Eventually speed will build and from a rig point of view while reaching sheets will be eased a little and come back on as the boat pops up. Throughout the race the teams will constantly adapt their sail plan up and down the apparent wind range. I was watching it on Sunday the wind was at about 15 knots yet the boats achieved 43 knots angling downwind and 25 knots angling upwind.

Its striking to see the Kiwis cover a lot more ground at a higher speed sailing lower angles to the wind upwind and higher angles downwind. The catamarans used for the 2013 Americas Cup were expected to sail upwind at 12 times the speed of the true wind and downwind at 16 times the speed of the true wind. Reaching speed for the AC50s in 20 kts of wind was 42-43 kts the AC75 could do 50 kts if.