AC37 Eureka Moment: Team New Zealand Double Mainsheet

Could these independent mainsheets be the eureka moment of the 37th America's Cup?
Recon video and photos credit to Recon Photographer / @America's Cup
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[@strozzascotte]

Seem a really clean and ingenious system. TNZ is ahead of the game.

[@LanceRyley]

as usual...

[@andrewlamb5868]

This is ingenious. Took til the 6m - 6m30s moment to grasp the so what. It’s Bernoulli where you’re basically able to adjust the wing dynamics to increase thickness and thus wind flow around both sides independently instead of tieing the ratios together. Very obvious in hindsight but utterly ingenious and brilliant to invent. Proud of these kiwis. Here’s hoping the other teams can’t copy fast enough to compete with same innovation. It’s this that makes America’s cup innovation so ground breaking and fascinating.

[@TheCruisingKiwis]

Yeah I was the same at that point in the video

[@craigschruhm2379]

The depth to which you go in studying the latest updates is so impressive. Independent sheets seems so obvious yet only NZ have done it. As an Aussie boat builder i proudly say GO TEAM UN-ZUD!

[@Antipodean33]

You're an Aussie boat builder cheering on the enemy over the ditch, whats that about?

[@TheCruisingKiwis]

Beauty

[@willypane8968]

Forget about the structural extra weight penalty. That can be engineered out, spreading the loads for'd to counteract twisting loads. Ok, you have an extra ram, BUT SMALLER, say that the loads are 10tons per leach (i remember figures of 8t for cunningham loads from last cup), a double leach like pulley/yoke /other, would be TWICE that. Actually, smaller rams might be faster and more responsive. The drawback is more the "having the extra complexity/brainpower" required...2 sail trimmers? Joking. DEFINITELY EUREKA. Bad day for the other teams...until you discover Their Eurekas...(p.s. Great job !)

[@plazma1215]

Thanks Dud.

[@michaelrosspearson9756]

An 'Oh No!' moment for the other teams.

[@Clipper_Dames]

Imagine the other teams, if they don't already, having separate teams whose only job is to wait until ETNZ unveils each mechanism of their boat then work furiously to figure out what it is, how it works, what it does and how to replicate it 😂😂😂

[@bobdillon1138]

@@Clipper_Dames Bit late in the game to replicate i would say.

[@dulls8475]

The modesty of the kiwi used to be so respected. What happened to you?

[@tristankiddie1710]

​@chuckd5819 what are you on about? How does your comment relate here?

[@michaelrosspearson9756]

@tristankiddie1710 your not serious right. Your a troll? Why don't you ask Mozy, they technical expert who downloaded the vid. If you open your eyes, you'll see he's liked my comment. That generally means a person agrees, oh! And 49 others. A little advice for the future as it seems one didn't complete their education. The sequence rolls as follows. - Sight, then brain, then mouth, or in this case, tippy tippy typing. You have missed out the 'brain' sequence. If you don't understand, please ask another adult to help you. God bless.

[@communistgreyman2078]

Stop given away our secrets bro, I don’t wanna send da boys over. 😊

[@MozzySails]

😁

[@BeachcomberNZ]

We're already on our way!😉

[@slidey1788]

Captured spies will be confined to the back of Rimmers van.

[@TheCruisingKiwis]

Hehe

[@honahwikeepa2115]

Love your work bro 🤩👍🇳🇿

[@artistglyn]

Kiwis ahead of the game again...... watching the first test sails she looks very stable and fast. Can't wait to see how she goes with the new foils.

[@dulls8475]

Your ground breaking inventions rule the world.. We need an English lead designer...

[@actiaint]

@@dulls8475lol, you really think if he was on your team it would make any difference 😊

[@artistglyn]

In NZ it's in the DNA. If you go back to the first NZ challenge in 1987 we designed a GRP 12 mtre. They said it couldn't be done, and we all know what Dennis Conner said....

[@dulls8475]

@@actiaint I wonder why they pay him then?

[@garethnuzum2795]

@@dulls8475 We have Won this cup in the past 100 years without an english designer as well 😂

[@jasonpickens9839]

I was just heading out to the shops yesterday and saw her ripping around in the distance. Dunno what it was but something special about seeing it in person even if it was a long way away.

[@TheUltimateWriterNZ]

Love seeing her out in the gulf!

[@fabmanly1070]

When it sails right past you on the water, it’s even better.

[@real2gone]

Wow. A deep dive here, Tom. Quite an exposé. Well done.

[@fightinfalcn1]

Awesome insight. Cheers mozzy, love your vids!!

[@MozzySails]

Much appreciated

[@Chris.Davies]

5:55 - very fascinating. Even though in aeronautic terms, the leading edge of the wing essentially IS the wing, there are a lot of things you can do to the shape of your wing if you have control of both upper and lower surfaces. I find it easy to accept that TNZ have established a process which allows more efficient lift production while reducing drag. And we all know that Glide Ratio = Lift/Drag - and who doesn't want a better glide ratio?

[@tallteacher]

In my mind i think the key will be the ability to quickly change the characteristics of the foil through manoeuvres. So through the tack the foil is flattened and has the surfaces close together, no lift minimum drag. After the tack the surface move apart creating more lift to accelerate out of the tack. Then as Max speed is approached the skins get closer together to reduce drag

[@Gottenhimfella]

​@@tallteacher Indeed. I'm particularly impressed with the notion that it's so rapid-acting as to be able to minimise drag half way through the tack by behaving like a solid, *non cambered* wing. Also excited by the "trickle down" possibilities of the concepts, if not the execution (even, perhaps, eventually to cruising use cases, given the manageability of twin-skin soft sails in comparison to hard). For example, storm sails which could be totally featherered with zero lift, minimal drag *and no flogging* could be a game changer, cutting down the need to be reefed down for the worst gusts with the attendant problem of being woefully underpowered during lulls (which in very high but regular seastates, happens in every trough). On these boats, given that they're so fast, the full sail area is seeing storm-force winds all the time, and they never ever flog.

[@davidcromer7673]

Have been watching since the last cup and beyond, still blown away by your in depth knowledge and ability to simplify and pass on. From an engineering point of view it is extremely interesting to understand 'why' each boat would gain its strengths and weaknesses. Thank you for all of your hard work!

[@tristankiddie1710]

Awesome video breakdown!!

[@mckappe]

Grazie per l'ottimo lavoro, come al solito!

[@JamesYoung61]

As usual you have shown how what might appear to be an insignificant difference could be a game changer and why, oh and I think the Luna Rossa looks by far the best of the pack so far. Keep up the great work, I am looking forward to seeing what is to come.

[@GR-yf1cm]

Love this can't wait to see what you find on the other boats 👍👍👍

[@carbonarne675]

You are pushing it! Video looks sooooo good and sound is perfect! Thanks so much for the effort and making my day better again!

[@MozzySails]

You are so welcome!

[@philrogge]

Awesome stuff as usual

[@MozzySails]

Thanks again!

[@freeaccess5905]

great video!

[@deano41.123]

Cheers, thanks again for the great content.

[@jpbproduce4515]

awesome vid, lots of tech details . Many thanks

[@MozzySails]

Glad you liked it!

[@fluiditynz]

Fascinating. Next level active chord control.

[@TJohnsonLLC]

Stunning episode, well done. Cheating the wind, better than ever.

[@ActiveAquaSPORTSOlympicS-ul1sw]

Thanks so much for explaining the mainsheet , double skin controls... perfect.

[@tallteacher]

Thanks for another brilliant video. I haven’t been an active sailer for many years. But as a teenager the mechanics of sailing were my passion. So lovely to have a way to reignite that passion Like so many ideas this sheeting system looks simple, once you’ve seen how some one else has done it. My gut feeling is that the independent control is going be massively beneficial, particularly controlling the depth of the sail, meaning the distance between the 2 skins. I think i might have to take up RC sailing in retirement so i can run my own campaign

[@FlyingboatsRCG]

Great work Mozzy! Thanks for burning the midnight oil to keep us updated :)

[@MP48]

Greet description of the main sheet control 🎉

[@TheCruisingKiwis]

Very interesting

[@peterwor]

I LOVE this new mainsail sheeting system, the leech of the main looks absolutely outstanding.

[@MrSingerphotographer]

So does Blair

[@charlottescott7150]

Fascinating!

[@skylineeeeeeful]

Great video! Hope this doesn't kill competition too early..

[@JahsRulz]

Brilliant, concise analysis as ever. Ka pai! Great 'photoshop' animation of how the rams for the main skin sheets are now on the traveller. Once again ETNZ come out with a simple, efficient adaptation that makes you go: Huh, why didn't someone think of that before? You're right, just as consequential as the mast-ball/lowered-deck last time, and the rotation 'yoke' under a flush deck is a neat touch. Cheers!

[@user-jd4ow7wk7g]

Bellissimo servizio come sempre il tuo che tutti gli sfidanti saranno be felici di analizzare. Grazie e sei sempre il migliore.

[@setts3]

Fantastic! Thanks Tom!

[@TheCruisingKiwis]

Beauty.

[@ashleygenefaas909]

There's double the potential at 3mins mozzy 😉 Thank you for the interesting videos.

[@paolocecchelin3705]

Bravo

[@Pma16]

ETNZ are well known for their innovation, they always seem to out-think their opponents, an I suppose you have to be when your not as well funded as the others, thanks for the insight

[@thedoctor907]

​@@floodo1Wasn't the case in Bermuda or with the AC72's (they showed their hand too early in the latter) or many other times they have been innovative.

[@Pma16]

@floodo1 Yes, ETNZ were the first to foil a AC72 and in Bermuda 2017 when they turned up with the cyclors, the wing trimming xbox control and all the other hidden gems, that was the most innovative boat, and it didn't just win the cup, it smashed it, even after a capsize

[@kelbatt7729]

New Zealand ,the little country that could- when it comes to sport anyway

[@arlynculwick]

Amazing work! Very curious to see how the other teams end up controlling mainsheet and "outhaul" on two membranes.

[@CraigOverend]

My favourite high lift/drag airfoil designs all have additional camber on the trailing edge, I wonder if we'll eventually see quad sheeting systems to get something like flaps for additional lift in light winds and for taking off.

[@MEastland]

Great analysis. If TNZ can minimise the significant speed loss while tacking by independently changing both main sheets, that is definitely going to give TNZ a big advantage - both in tacking duals as well as catching up from behind. I imagine it will take a while for them to find the right combination of adjustments for different wind speeds. Lets hope they have enough hydrolic power for all the fast & high-pressure adjustments

[@daviddickinson6346]

Love the channel. Will the other teams be able to cooy this if they want to.

[@alistersladen1212]

Hey not sure us 'locals' should be taking photo's for your intel...... and the other teams of course. :-) Great coverage as usual thanks. I'm down in Christchurch so I certainly won't ....or can't help LOL

[@Fr3DDy73]

super interesting

[@daviddickinson6346]

Love the channel. Will the other teams be able to copy this if they want to or is it too late. Cheers

[@Antipodean33]

Fascinating stuff, these boats are right out there. As someone who isn't the racing type despite loving the round the world races etc. I'm not up there when it comes to some of these new fandangled ideas coming out on this advanced boats, for instance this double sail skin set up. Can someone explain to me what the idea is behind this double skinned sail and it's possible benefits? Interesting clip champ, look forward to seeing your take on these amazing boats

[@perbomahler9465]

Another great analysis. Thanks for all your trouble. Would you have ticklers on the inner and outer skin to unjust individually? Could it be interesting to separate the two skins completely to slow the boat (parachute effect), for starts and crossings? Better speed control? Thanks again

[@pierocostantini2864]

Looking at the Alinghi footage today, they seem to be the only ones with a very low deck. I guess they kept the main sail hydraulics between the two sheets. LR and ETNZ, on the other hand, seem to have something larger under the deck.

[@MozzySails]

Agreed. Interested to see a bit more of Luna Rossa soon

[@benjaminweslake4174]

It seems Alinghi have kept the main sheet system from the previous boat kzbin.info/www/bejne/kJTXgKOGr9eme8ksi=q-5G33wFCcvEHaL1&t=148

[@simonpuxley7374]

Great spot!! What are your predictions for the remaining boats?

[@floodo1]

Kinda cool to see the evolution of sail control with the 3D job sheets and now this. Not too surprising as I’d think aero performance trumps all

[@robertbaird4822]

Thanks for giving away our secrets

[@ScottSummerill]

So ... I spent a boatload at Allen Bros this winter. Learned about Allen thru this channel. I actually like their website and product line better than Harken. Plus, just tired of seeing Harken everywhere. Wish I had the discount earlier. :)

[@jimmoore8920]

Well done again Mr. Moz.

[@danielrepko347]

Thanks all your interesting analysis. Just wondering how long it will be till we loose you to one of the cup syndicates.

[@guytaylor-smith2819]

This sheeting system will give them a big advantage down wind where they will be able let the leeward sail bellow creating a negative lift.

[@rossmurray6849]

I did not understand one word of this but it sounds like NBZ have outsmarted their opposition yet again.

[@sweetwater5030]

Lovely clean mechanism. What else is hidden away?

[@Silvius.2]

How interesting would be see inside doubble sails control lines. ...

[@tomedom5107]

I disagree about extra reinforcement of the traveller. There seems to be an under deck boom which will be soaking up all the off axis loads that don't line up with the traveller?

[@tomosorio7530]

Is the "pumping" visible as each main change/simulated tack occurs simply to overcome the 'stickshion' between the windward and leeward sail surfaces or could it be control of the sail shape during the manoeuvre - i.e. the old traditional top-batten flick or to minimise drag when going through the wind?

[@carbonarne675]

Low wind down wind butterfly mainsail opportunity 😮

[@honahwikeepa2115]

Kiwis are smart. Punching way above their weight. Probably the paupers of America Cup racers.

[@TheCruisingKiwis]

Proud

[@zlm001]

I'm just surprised more teams haven't tried this unless the challenges in overcoming the negatives are much greater than I imagine.

[@andypughtube]

"Can't think of any reason to have one skin on one end and the other on the other of the traveller". How about a Ljungström rig for displacement mode downwind when things get desperate?

[@MozzySails]

Well yes, that is one situation!

[@tristankiddie1710]

Hey Mozzy... i know you must be busy... wondering when we get to see your next great analysis as there is so much being releases at the moment?

[@MozzySails]

Working on it! If I am honest I am weighting to see a bit more of the deck of INEOS. There will be a video by the weekend at the latest.

[@AntiVaganza]

Maybe a noob question but how big of an issue is the weight penalty really on these boats in terms of adding structure like this? Are they struggling to keep to the minimum weight at all so far? Obviously, it would mean a some more weight aft, maybe so much so that the rudder has to have more lift which comes with a drag penalty, is that it?

[@funnystuff9998]

Imagine counter loading the mast horns against the sail skin sheets.

[@lancehaysom47]

Just confirming my theory that TMZ will kick ass

[@TheCruisingKiwis]

Hope so

[@marknicol4957]

Jib system under deck you get a quick glimpse 3.30 ,all working in unison.??

[@chrislambourne4275]

How about putting each sheet on a separate traveller. You could then adjust the separation between each skin. What is the physics on the distance between skins at the clew?

[@Gottenhimfella]

The only advantage I can envisage of moving the clews apart would be the ability to goosewing when running dead downwind in displacement mode (Google Ljungström rig) but I think the time limits mean that would only be beneficial if the wind fluffed out on the final leg of a race.

[@jimmyboy2]

Also more sail area. Do they release race weight? Like boxing 😂

[@sezione-m-paul]

Mozzy, I saw your observation on other Teams (not Team NZ) controlling the double mainsail via a "passive" mechanism : or let's say that those Teams use a 1-degree-of-freedom mechanism , instead of a 2-degree-of-freedom one (that is the way of the new NZ device). Having verified that Luna Rossa has 2 cylinders to control the 2 layers of the mainsheet (see 4:57 , that is the old system used on LR's leq, similar to that used on LR's AC75 + Vittorio D'Albertas' confirmation on the presence of 2 cylinders + Sailing Anarchy photos on the matter) , thus I suppose that it will be a "relatively easy" task to convert the 1-degree-of-freedom mechanism into a 2-degree-of-freedom one (NZ style) . The important thing is the presence of 2 cylinders : then a conversion efinement\evolution should be possible.

[@rusty7720]

The other teams will be on to it pronto, they'll copy it for sure.

[@peterihre9373]

What is the things sticking out from the podd, just above the foils? Looks like lanterns😀

[@MozzySails]

They are LIDAR sensors. To measure sail shape

[@peterihre9373]

@@MozzySails ok, thanks! Guess I need it on my Bavaria 33 🤣🤣

[@ohmyluckyday]

I don't see how the mast can rotate if it has spreaders attached to the shrouds (as far as i could see). can you please explain that. thanks

[@MozzySails]

The spreaders aren't fixed, but can swing as the mast rotates

[@ohmyluckyday]

@@MozzySails hello, thanks for your quick answer. I'll try to look again. i had the impression that the spreaders are connected to the shrouds. (there aren't many videos that focus on that height level). Another questions if i may, concerning the jib. contrary to the main which is very high aspect, I often see jibs which are small and low aspect. (they are also quite far from the main), I had the impression that they don't contribute much to the driving force, but serve mostly to balance the boat (on the Yawing axis) what do you think ?

[@aaronpercy650]

traveler separation would be used for air breaks :P

[@MozzySails]

😆

[@williamgraymuir6678]

Riveting!

[@tiberiuscx5847]

@Mozzy sails,I'm a 40 year AC gear head from the states.I love your insight and knowledge on cup updates.I'm working on R/C one meter scale of "Comanche".(with canting keel)Thank you so much!BIG FAN!Cheers Topher

[@tiberiuscx5847]

Thanks brother,always like your insight and non bias input.Let me know is there is anything I can do to promote your channel!Much love and support.Cheers Chris

[@erikwellerweller8623]

Am I the only one imagining a boom under that deck?

[@adrianthompson5322]

I don't believe it is too late to copy this if the other teams think it is a game changer. They will be on it, make no mistake. I wonder if any of the other teams would have figured this out or even noticed it without Mozzy's help?

[@deandavey7849]

Go team new Zealand 🇳🇿 ❤😊👍

[@TheCruisingKiwis]

Yeah!

[@johnietaylor1817]

kiwi ingenuity, we export it now.

[@sailbags]

I thought they were prohibited from having "2" mainsheets, and that the skins couldn't be adjusted fully independently from each other?

[@frednedgold4636]

or a mechanical connection via a cam

[@dfontyn]

No INEOS observation...?

[@ScottSummerill]

Where the heck is AM?

[@charlestoast4051]

If those movements of the sheet tensioners are in any way automated, it detracts from the skills of the sailors. Sheet trimmers maybe a thing of the past?

[@boscaratosergio1190]

Si possono avere i sottotitoli in italiano?

[@MozzySails]

Yea, just click subtitles below and auto translate

[@davidtydeman1434]

Amazing that your channel offers so much more than the official, professionals👏👏👏👏

[@peterhones3594]

Black magic it always takes a bit of magic to win the Americans cup

[@EmmaSteel-lp2vs]

This traveller and double mainsheet design looks to be an area where the automation possibilities really show their benefit. I doubt it would be practical or possible to achieve that level of adjustability of the sheets without automation. Perhaps this is what Magic got all upset about with their "autopilot" comments?

[@BlueMoonday19]

Mozzy in case you haven't noticed, INEOS have revealed their new boat. Just saying... 😂

[@MozzySails]

I did see it :) I was hoping for some images of the deck... but with or without updated recon I will get a reaction out for this weekend

[@erikwellerweller8623]

So I have watched this again to see if you directly say there is a boom under the deck. You hint at it only. There is very clearly a boom under that deck. It does not have to connect directly to the mast but go a significant way towards the mast so that the deck does not bear the load. There is no other reason to have such a large cutout in the deck and you can see end of the beefy structure. I think the race will come down to Swiss hull vs NZ rig and sailing. Flip a coin but I give the edge to the Kiwis. Red Bull's aero and chassis development has been crushing in F1 but I think the Kiwis better understand sailing. I think controlling those skins very precisely and powerfully is super important. Alinghi main sail doe not look good.

[@bradclifton5248]

With cyclors there should be no issues with hydrolic power.

[@grahamcrooks3581]

Noticing that there's an impressive distance between the mast centre and the mast rotation centre. Having to design and experiment with a simple dinghy rudder, I know that there's an enormous amount of maths goes into this aspect of design to get the loads within limits. Well Done TNZ

[@miljenkomarinkovic838]

Is it legal? Almost like having two mainsails.

[@Penguinracer]

There's a video (link below) in which Geoff Senior says that the build team have been watching every gram so as to save weight. It would seem that with the mainsail / twin-skin sheeting system & the below deck structure required to support the loads, they've had to work very hard to save weight wherever they can. kzbin.info/www/bejne/jHPbgJpjn5mGfpo

[@russellblake9850]

yes an extra actuator, but wouldn't these two be smaller than the single actuator under the strop of the conventional system ? but yes, there would still be some added weight to support the two actuators. for me, an extra control can give you an advantage, if you understand how to use it properly. else it becomes one more thing to get wrong ! this reminds me of one of dad's jokes ... what's the difference between a magician and a chorus line ? except to rephrase ... what's the difference between a magician and a kiwi sailing team ? Go Tom (Slingsby) ... get them next time (again) ...

[@erikwellerweller8623]

I think Red Bull have the hull war won but I expected NZ to pull a rabbit out of their hat with rigging, and they sail HARD.

[@chris_nalder]

Mate.. Love the content. Wish you had less accent tho...... thanks for coverage.

[@Silvius.2]

🙏 team NZ knows last luna rossa strength.... sail control this time its most important! Foild development all invested anyway most? Doubble sails controll was and even bigger having impacts! GB was horrible about they sail controll last cup? Never only they foils. 🙏 team NZ revolution of sail controll and winning cup again ❤️!

[@Gottenhimfella]

Luna Rossa seem to me to be the team pushing NZ the hardest. They're a very impressive challenger with a great team and sporting culture as well as skills, and they've been near the top of the AC game almost as long as NZ. They were very highly regarded in 2000 in NZ, and even the most patriotic of kiwis were celebrating joyously when they won the challenge series.