America's Cup Winner Returns... here's what she's hiding 

A recent interview with ETNZ indicated they did over 50kts on one of their training days after Te Rehutai was back on the water. This yacht is such a marvel of modern sailing technology. I can never get enough of watching her fly.

Really nice touch in the edit with all the random Blurs! I had great fun catching them all. Actually had to watch the video twice because I zoned out spotting the blurrs.

Thaaaaank youuuuuu🎉 perfect upload! Now I have to watch it. Thumbnail was spot on

Good work, mate. Well based speculation, dots are connected coherently. As a non-sailor I am riveted to the upcoming competition. Can't wait. I hope Emirates Team NZ manage to pull it off again, either way I am sure the racing will be dramatic and enthralling.

Great insight as always.

Great stuff! Thank you Mozzy.

Great video again! Love your insights and thoughts 👍🏻

Wouldn't surprise me,they are pretty crafty. Great video

Bring on the gas-feed super-cavitating Turbo Button! If enough excess power can be harvested by the cyclors, then an additional high-pressure reservoir of air can be built up over time. That gas can then be vented through tiny holes at the leading edge, placed so that the foil is completely surrounded by a super-cavitation bubble of air, which would temporarily drop drag by an order of magnitude, effectively giving the boat a Turbo boost effect when used.

Another great video Moz, very insightful.

Quality as always

Another great analysis, Tom.

Thanks so much for these! I really wish you were around back in the day! (I grew up in RI and watched the cup in '77, '80, and was there when Australia won in '83.)

Interesting vid as always. Love the elegance of the simple etnz foil design and looks like Ineos are trying to decouple the various forces generated by the foil, assuming based on the predicted sea state and better maneuverability. If possible could you do a vid on the rudders and to see if these are evolving? As a guess I'd say etnz are are thinking foil lift/drag is king and using the rudder/other methods to control ride height, heal etc. Looks like ineos think best boat control / maneuverability is key. Interesting to see who is right but ac history does suggest the fastest boat in a straight line wins but maybe its a boat for Ben to win starts and errrrr be Ben Ainslie....

Another great story Mozzy; your analysis of what the teams are doing design wise is fascinating and fills in a lot of gaps with info (propaganda) we get from the teams. I was out on Auckland harbour last week and saw Te Rehutai in action; she certainly looks quicker than she was in the last cup, but didn’t see quite as “nimble” in the tacks/gybes. I believe that at some stage they will take her out into the outer harbour to get into the swells; that will be a good test to watch. I’m a bit nervous as to how she’ll cope with the conditions in the Med.

Great stuff! Love all your coverage of these new cup boats. Are the crew pods allowed to be completely covered?? Can't wait for the next ...

Actuators are the movement engine, but what happens after that is open. Levers, cables, lines, sheaves, balloons, slave cylinders, ramps, flexible forms etc. Off course the ultimate I'd to build a self regulating foil that flexs appropriately in response to changes in realtime. This opens the possiblity that the energy comes from one part of the foil and hydraulically transferred to another. Only small movements are required to effect big changes in trim. So it could be simple of complex, but so far is a very elegant solution that seems to work well.

Great update Tom. I don't understand why raising the jib tack up is optimal on this size of boat. Surely you would want uninterrupted flow along the foot on a sleek deck, not allowing the pressure to equalise I.e. using the deck as a seal. It's a big chunk of sail with low moment to lose. Also, on "hydraulic" actuation (I may well be way off) NZ may be remoting the motor to the arm, so to power the hydraulic system independently. It avoids some plumbing issues.

I almost don't understand a word, been sailing as a teenager a bit, windsurfing afterwards for several years, that's about my water experience 😉 - and English is not even my first language, so your accent doesn't make it easier 🤣. But I still enjoy your explanations, trying to follow the main line, and especially all the "politics" surrounding the AC. And beeing Swiss we had a lot of that 20 years ago and makes me of course more excited about this AC! BTW: seeing you sail yourself was much fun too! Thanks for your efforts!

Choosing to blur some areas of interest in photos but hiding nothing when launching or relaunching could be great strategy also haha. I’m not saying they are not hiding something. Only that it can become mind games between teams…

Mozzy you are the greatest

interesting !! Now that you've "outed this, it makes me think that the flap actuators could be horizontal arms with articulated attachment joints on to electrically powered screwjacks.

Is there another RU-vid channel with less resources that offers greater value? I haven't seen one. 👏👏👏

Thanks

The first word of Te Rehutai does emphatically NOT rhyme with tea, for two reasons One: in Maori (as in Spanish and Japanese) the "e" sound is the e in "egg". This is true for all words, and so it applies to the "e" in Rehutai as well Two: unless there is a horizontal bar (macron) above it, a vowel in Maori is clipped short, not held long like the vowel in "tea". Sometimes the way you said it sounded spot on, and good on you for taking an interest in getting it right!

Loosing the back stays is no surprise, it's no good second guessing ETNZ, they have a history of innovation and shapeshifting within the rules.

Bear in mind that if Robs theory about ETNZ's 'banana' foil is correct they might not have to house an actuator at all, or at least one that is to small to actually move the flap and doesn't impact the size. Great video as always Mozzy, keep up the good work 👍

Seems like an obvious move to move the actuation above water if possible. Aero and hydrodynamics surely are top priority

Nice salute to the viewers @1:31

Maybe ineos is using 4 flaps actuators on te W foil for testing and eventually only use 2 when they figure out which is best ie inner or outer flap control

Tena koe, the following may help with pronunciation - Vowel sound phonetics A (car) E (red) I (ski) O (or) U (you) Roll the “R” Te Re-hu ta-i Many, like myself, appreciate your willingness to at least try. We don’t expect you to get it right however, we’re here to offer assistance. Very informative breakdown of the rules and possibility of maximising opportunities to push the boundaries within the wording of the rule. Your homework, if you choose to accept it, find the English translation of Te Rehutai or Te Rehu Tai? Kia kaha me noho ora mai no Aotearoa (All the best from NZ).

Have a look at electro hydrostatic actuators, an electric motor directly driving a hydraulic motor. Allows electric power transmission but hydraulic actuation. The foil actuator could be one of those? Can require some quite hefty currents. Usually the electric motor reverses direction to reverse the hydraulic flow, but that can happen quickly. How often are the foil flaps adjusted?

Amazing intuition and investigation as always Mozzy! Question: You say it is all hydraulics this AC. Are any electrical systems allowed? If the Kiwis have cyclors controlling flying height like they did in 2017, will they need to manipulate hydraulic rather than electrical control buttons?

There's certainly some sort of bolted on access cover in the area you believe the actuator is located.

Comparing this to Ineos W, with its lumpy actuators hard not to wonder/worry: is the Ineos W foil actually a clever way of testing multiple foil 'strategies' in one? (As with their failed towing mast tactic, developed a clever approach to beating the rules for development restrictions.)

Pronounciation for English accents: Tear Reh-hu-tie, with Rehutai run together quickly. For bonus points, you can roll the R sound like in a Glaswegian accent.

Simplicity often is the best solution

I think ETNZ, having the upper hand, made the best choice for development. Using the old AC75 which is still already the boat to beat, and then the double AC40 for a/b testing, put everyone else in the corner. LR, knowing that its AC40 would come too late, had no choice but to develop the LQ12. But they did it in the best way: by making a scaled-down version of Te Rehutai, as LR AC36 was not adaptable to the new design vision. The new ETNZ AC75 will probably be an evolution of the earlier design. And in that sense, having already installed on-board cyclors, they are a piece ahead of everyone else.

Your spoiling it for new zealand

As the rules were born from negotiations, ENZ subtly inserted language that allowed their electrical actuators without anyone catching on to their plans. Note that ENZ has already found a way to allow two boat testing. One must also wonder what other clever manifestations were hidden in the rules.

Hey Mozzy, Maori vowels are "ah, ay, ee, ohh, uuu" - like in Japanese or Slavic or Romantic languages.

I don’t believe replacing hydraulic actuators instead of electric is a big deal . ( If indeed electric was fitted to start with ) . They have more than enough mussel power onboard to compensate. Great spot by you 👍. Noticed an access plate above the water line on the arm , a clue ?. Great video, thanks for sharing.

Some of your 'Te's we're beaut! ...keep it up Mozzy :) oh btw, nice insights into the evolution and design concepts, and IMO the elegance of simplicity. I'm sure Ineos will ditch those foil warts once they decide W is really worth pursuing .

Albatross foils! Awesome.....

So... Glen ashny and his (And TNZ's) new land sailing speed record!! Is this simply TNZ exploring new ways to experiment wings and loadings without needing a boat or limited to just one mast for testing? How much do you think they can take from this and contribute to the Americas Cup Campaign?? It is even impressive?? Is the record sought after??

were you using a second Mozzie behind the blur for testing purposes?

What if team NZ's flaps adjusted in and out rather then up and down,out for lift of in at full speed ?

I'm a kiwi and I have no association with our America's cup team but I've wind surfed, kite surfed and now I've wingsurfed for the last couple of years. I don't see what's complicated about this, in my own foil construction of my own designs, there's a point in high performance at which making a wing thinner only results in unacceptable flex. (I am talking about carbon fibre here and I'M HEAVY so I flex things.) So you don't build ultra thin because it's counter productive. And the core of any wing is dead space, compression, tension and twisting loads are at their extremes by the skin and at a minimum in the inner core. So the answer is that if you are clever with what you fit in the core, you are only limited by your imagination and material properties.

I will always enjoy the Americas Cup “cat and mouse” games with the “I’ve got a secret” boat design games. This makes for a good size fan base and is true to the whole premise of the contest. Otherwise we would all be riding personal watercraft.

That slick foil makes the W foil look like a Christmas tree. It's gotta be faster...

I think you’ll find your answers on the Grassy Knoll 😮

Te Rehutai = Tare RARE-hoo-tie with the same stresses as saying "the waterfall".

Thinner foils =less cavitation? Does it make that much difference?

Those boats sure have changed since the last time I watched it. That was back when the US lost the cup for the first time. It is like it is not even the same kind of race anymore. It would be like a classic NASCAR race, and then later the NASCAR cars look like F1 cars. Completely changes the race.

If we gave Mozzy the Zabruder tape he'd have a suspect in short order 🤣

With cyclors wont they have more oil? They could replace the electric motor with a hydraulic version doing the "same" task in the "same" way ?

Great video, it's Te (kind of nasally think Michael MacIntyre northern Irish accent mouth open) Re (tongue to the roof of your mouth make a split second car sound by vibrating your tongue) hutai Who Tai as it sounds. Blair pronounces it correctly being from Northland, shot Blair.

Crazy/stupid question; could ETNZ be using skinned’ foils? Foils that have some sort of skin or whatever, pseudo malleable coating over the entire foil covering the hinge mechanism/flap? There is only one slit in the centre separating the two flaps either side and every other surface seems to be covered.

My guess is ETNZ will use the rudder for trim and have no moving parts on the foils.

Newby question: “Where does the electricity ‘come from’?” So, this question is about generation, ‘quantity’ and storage. I’m assuming a big battery isn’t allowed. Do the grinders have to generate all the power with that being stored in various ways (electricity in a battery, electricity in an electrical capacitor, hydraulic pressure/capacitor, pressurised air capacitor)? Thank you 🎉

te (teh) - re (reh) hu (who) tai (tie) ,,,,, or where the essence of the ocean invigorates our strength & determination

Just go sailing!

What if they have powerful hydraulic pump(s) doing the hard work unobtrusively?

wotz your feeling on the increased salinity of the med ...denser water. on foil design

lol 1:32 dude is flipping the bird

Te - it's not an 'eeee' it's more of a hard 'a' like an ā as in apple Re - roll your r - short e Who Tie Keep up the good work. Most of your videos are too technical for me but I'm learning slowly. Cheers 🙂

Why are they all of a sudden able to test with the old boat? I thought the old boats had to stay pretty much as they were? Or was there a date that changed?

Looks very very thin....huge stress on thin foils. Will they hold up on full trot?

So why would you assume any actuator hydraulic or electric would need to be placed on the control surface itself meaning down in the water creating drag and turbulence? It says controlled by not placed onto.

Well, that was underwhelming. Thanks for the PowerPont presentation.

I would just blur something random just to mess with the competition :D

From 6.42 "The new rule clearly says."... " definition of that it's a Hydraulic actuator"... Yes, but 11.32 actually says "A hydraulic actuator... In combination with zero or more TRANSMISSION ACTUATORS used to adjust a control surface." What is a transmission actuator? It seems to me in ETNZ's foil arm flange you could have a Hydraulic actuator that then feeds into an electronic transmission actuator, and then feed the signal electronically down to the flap?

On the actuators - if it's above the waterline does it matter whether it's hydraulic or electrical? Your animation shows linkages to a lever in/behind the bulb which then controls the flaps. And another question - does the amount of flap actuation (degrees up and down) important to the issue? Fewer degrees, easier to manage the linkages. If Team NZ can live with lower ranges then they can keep everything smaller?

👍👌❤🇨🇦

The Seaspray is a beautiful machine.

Regarding pronuciation: phonetically it would be - Teh-dehootai. In our Te Reo Maori, the R is rolled so you can pronounce it like a softened and shortened D sound. Te = The Rehutai = Sea spray

Looks like they be nailing it ;-) Get rid of that bulb and make a single flat nose instead, 60knots M8!

👍🏼🇦🇺

Kiwis can fly❤

Nothings simple in the AC , Might on the surface BUT there's many people working on it so its not That sir is what the AC is so interesting > Just when you think you got it ?

I know things all over Ineos W are for testing and stuff but bloody hell I just can't see that foil working even remotely near optimal with all that hardware stuck all over the outside of it.

It’s a slow build up to the racing next year, but thankfully you make it interesting. It’s very interesting that the designs are so different from each other. Do you know which foil is expected to work better in which sea/wind state?

Just call her T-Rex

1st class

Try saying it this way? Te___ReWhoTie

For everybody that says there is no way nature can power something beyond current norms, has never seen the new America's Cup.

Tair - Dare - Who - Tie .... Te - Re - Hu -Tai

Are they even sailboats anymore?

Try saying "Te Rehutai" like Tear Rare-who-tie just roll the "R".

Teh RehHooTie is my guess

Make them use mono hulls and get back to sailing a yacht.

It’s being reigned in, otherwise it’s just going to break

Random blurring 😂

The crew know how to fly boats. Everyone knows how to build one. NZ know how to fly one.

Cares

Hardly anyone watch's the America Cup since it became a huge investment corporate technology race of advertisement. Instead of a sailboat race where the skipper and crew win the race and it's now who has the best technology.

Can Kiwi fly they do over 50knots ....

I wonder what you are hiding with all those blurs mozzie haha

I don't understand ... Why can't a hydraulic actuator be in the foil arm doing the same job and maintaining the sleek foil format? Sleek has got to be a lot better

This sport seems to be heading the way Formula 1 is going. The rule makers are behind the game as the teams are coming up with ways to stretch the rules all the time. Formula 1 is losing its appeal as the true driving skills and racing between cars is being nullified by technology. Racing fans often prefer to see results based on drivers skill. Remember "the good old days" when the Americas Cup was about true match racing, good crew work basic navigation. But these boats are good to watch as far as speed goes, no doubt about it.