I'd like to see how these racing machine perform in heavy air.

Do you need to have steady wind for these boats? What if the wind is puffy?

@@davidho2977 they have a minimum amount of wind approximately 6 knots and a maximum of approximately 20 knots. Reason for these limits feels so that they are finished within 45 minutes or it is terminated. So they don't sit out there all day doing nothing. Also sailboat races have a time limit for the same reason. The maximum wind is set so that the boats aren't broken to pieces.

Exactly what I thought too!

The animation is correct. Pitching the flaps down increases the camber of the foil which results in a higher lift force to raise the boat out of the water. Think of flaps used for takeoff and landing in an aircraft, they are used to increase lift at lower flight speeds.

Your thinking is on the wrong side of the axis of rotation

@@jackdavies5784 agreed, but then I’m curious, how do you control the global pitch of the vessel? Done topside, somehow? Edit: oh I think I’ve got it; the horizontal control surfaces of the rudder could act to control vessel pitch

Not allowed under the rules

That would increase drag. They are stable without having both foils in the water and if you watch the first few runs, the teams already look pretty confident with their boats already.

Allowing the windward foil to be in the water would allow teams to generate additional righting moment and hence more power - arguably too much that would create serious structural issues. The other reason is that the defenders in any cup cycle want to be able to to limit the amount of righting moment and hence know the max power of all of the challengers. Creating rules that place a cap on righting moment by preventing the use of a foil that pulls down on the windward side one way of doing this and easy to police

You may already be aware but the ocean racing boats are using foils. See the Vendee Globe boats for this year (2020).

Big foils like these don't work so well in ocean waves. Imoca 60 already have foils but they are not flying like this since the drop down would be too destructible...

@@jussimaristo8979 Yeah true. The Imoca 60 foil boats are not fully flying like this. But they do lift quite a bit of the hull out of the water much of the time from what I can tell. The aft section of the hull is almost always in the water, though.

Water is compressible, we just like to assume its not for the sake of calculation

It’s not a rule. Quote often they use both. But in general, at high speed, when foil lift comes over and the boat actually flies, the wind torque can be balanced only by one foil in the water. If there are two foils in the water you have not the force equilibrium. It’s a very simple engineering exercise.

@@rich8713 thank you. They said'by rules' so I was currious.

The grinders create all the energy for trimming the wing sail and the jib, powering all the Maneuvers, and adjusting the heel and the ride height.

@@allentobolewski7273 Thanks but please elaborate. The energy is stored in a battery? On a normal yacht, the winch is turned manually which rolls in the sail and jib at the same time. All I see is the grinders continuously grinding to no end. Surely they aren't always trimming??

@@skeche . There are two types of Grinders. one is direct drive to turn spindles for trimming the sails. The second kind is hydraulic to move the Mainsail and lift and lower the Water wings.

No, they're hydrofoils.

I watched a video where Team NZ said they had a comp programme they told them what was the optimal way to sail and it was up to the sailors to get there.

It sounded to me that the crew was just there to charge up the batteries that drive rams to do all the foil and sail control.

@@davidho2977 rule 52 violation...

You can hit "k" at any time to pause.

@@davidho2977 You totally missed the point.

Sailors are so conservative. It is so stupid. Has really held the state of the art back. The single skin sails with wire stays should have been left behind a decade ago or more. Anyway, the latest ocean racers are using foils and they will be in plenty rough seas for the Vendee Globe race. So we won't have to wait long to see how that works out. Mind you, I would not want to go cruising on a foil boat. But there is a lot of room for improvement in the rigs. I think it is only conservatism that has held us back.

Sailing is stupidly expensive when you consider the huge amount of capital that rarely gets used and quickly deteriorates. I sail on other people's boats rather than be guilty of the same waste. And I would oh so gladly sail on these other people's boats. Maybe one day when the price of any such technical devices drop due to them becoming more commonplace I might get a chance. The sailing that 99% of us enjoy all too often involves snobbery towards others that have spent either less or more than we have.

What a stupid comment. It's like saying F1 racing is not the driving 99% of us enjoy, I'd love to see an F1 car drive on an off road trail... they're a specific machine developed for a specific purpose. Horses for courses.

You may not be excited to see these technological marvels race for real but a lot of us are. I don't care that I'll never get to race an AC75 (although if someone wants to offer me a ride I could be persuaded) but I'm really looking forward to seeing what these boats can do and I know I'm not alone.