Latest INEOS tech: Why? How?

Sophistication or overcomplication? INEOS traveller system certainly had me stumped!
Recon video and photos credit to Recon Photographer / @America's Cup
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[@richardmyers6054]

Have had to watch this twice but think I understand. The coloured sail twist diagrams were fascinating. The AC back of the boat camera only shows the traveller so the changes to the rest of the sail is excellent. Love this geekery.

[@MozzySails]

Glad it was helpful! I think a complete video on main trim controls and how they effect shape should help

[@richardmyers6054]

@MozzySails Cunnigham was really interesting as a radial sailor. But it's the weighting of the difference I found educational. Are you, tom and darth vader all engineers. Physics assumptions suggest so.

[@anmihovil]

Great effort mate, I'm impressed! This kind of in depth analysis is hard to find. Cheers mate!

[@MozzySails]

I'm glad you enjoyed it

[@peterebel7899]

Oh, it's easy to find: Type in a m Type in an o Type in a z Type in a z Type in a y Type in a s Type in an a Type in an i Type in a l You got the concept??? 🙂

[@jamesaron1967]

Great stuff, you're quite resourceful providing us with computer animations plus a mechanical mock-up of the INEOS traveller system. Impressive and well done!

[@brokiepmb]

Thanks for the outstanding explanation and model building. Yours is my default site for all things AC. Seasons greetings and fair winds...

[@sly6627]

Ah the old biscuit tin full of spare parts. Great insight as usual.

[@MozzySails]

It a classic spare parts box!

[@JamesYoung61]

Sometimes I have to build something out when I can not visualise how what I am seeing actually works, thank you for going through the process with us because I couldn't see it either.

[@ikerstges]

the last second in the footage of your model made it 'click' for me! great stuff, keep 'm coming and thank you! merry x-mas to you and the team!

[@watsoncj1962]

What you do is very insightful. Thanks & I look forward to more 👍

[@MozzySails]

Thanks C JJ

[@francescopierre-nina9515]

Always informative and well worth waiting eagerly for the next episode.

[@trevorgissing1208]

Wow, took me a while to get my head around that. Excellent work Moz in making this understandable. 👍👍

[@MozzySails]

Glad it helped

[@freeaccess5905]

Great video. Love the details, graphics and demonstration. It really helps us understand the designs

[@MozzySails]

Great to hear!

[@bhines239]

That was awesome! It didn't make sense to me just looking at it either, thanks for building it out!

[@MozzySails]

Thanks Bill!

[@stewyboy2k]

Love it Tom! Reminds me of sailing the Tempest on Ullswater, and pulling the moveable pulley system centre traveller over each tack, as it gets too windy and Dad too lazy just ease off the traveller rather than heavy mainsheet more effective on big blowy days and less work on a long upwind. And in light winds could pull the traveler further over to windward. Really enjoying your videos. Have a great Christmas. James :)

[@MozzySails]

Hey Stewy, great to hear from you! How's Aus? You still down there right? Have a great Christmas, and pass my best wishes to your family!

[@derekness7900]

Really good analysis-thanks

[@beezergood]

Very interesting - well worked out!

[@james5553]

Love the diy approach - sometimes it is the only way. Thanks for the effort. I am slowly making my way back to racing after some health upsets, my races tend to last days though! Happy xmas.

[@MozzySails]

Thanks James, and all the best with your sailing in 2023

[@AndyUK-Corrival]

Great insight as always. It is certainly fascinating seeing the developments. Andy UK

[@MozzySails]

Cheers Andy, and thanks for supporting the channel this year!

[@nickgoodall578]

I was at work, watching this at 1.75 speed in a small window. I only got about 3 mins in before I had to stop, put it back to normal speed and pay full attention!

[@MozzySails]

😄

[@darrenpat7828]

Great explanation of the technology used. The 2D diagrams of the sail controls are brilliant. A 3D model could be used to show how the controls work independently and in unison to change the twin skin sail shapes. We need a 3D modeller to donate some time. Great work Mozzy

[@carlosneto9348]

Fascinating. Well done ! 👏

[@MozzySails]

Glad you enjoyed it!

[@nelsonion3529]

Quite a few cats that have a single line traveler system (like a self tacking jib) would work very similarly. Particularly as many would sail a lot with mainsheet. E.g nacra 17s. "Split tail traveler"

[@javiercifrian2787]

Good point. The problem with that system is that it only allows you to center the traveller, you cannot move it to windward past the center.

[@markbaker9305]

Thanks for sharing your insight.. Great video..

[@MozzySails]

Glad you enjoyed it!

[@ianjudd2909]

Great insight and love the “blue Peter” moment with the model…

[@MozzySails]

Glad you enjoyed it

[@tracker1265]

Thanks for the analysis 👍😎

[@MozzySails]

My pleasure!

[@johnbrynjolfsson5722]

Two questions. 1) About curved track. I get that a straight track implies that as traveller goes down, friction increases, and a fixed main sheet would necessarily tighten the leech. Undesirable. Slightly curved track can cancel that effect. Would it make sense to have an “Uber” curved track, so traveller down simultaneously slight induced twists? 2) If track is a constant distance from gooseneck, I’m not sure why it needs hinge.

[@MozzySails]

1) you could do, but the risk with over curving the track os that the car doesn't want to return to the middle, which where they are trimming up past centreline would be an issue. 2) they don't have a boom and therefore the sheeting angle on the mainsheet changes a lot. If the track didn't pivot the change in sheeting angle would lead to the car being side loaded and friction

[@DON-18]

Spiegazione impeccabili TOP!!!!!

[@lucashurt6639]

In the picture at 4.34, both rams are fully extended and the traveler line is tensioned. If one ram starts to retract, where does the 3x extra line come from if the opposite ram is already fully extended? I think we are missing something still. I wonder, what is the silver tube running across the web section of the traveler itself? Sensor conduit or hydraulic line?

[@MozzySails]

I think the silver tube is a sensor, there seems to be a magnet zip tied to the traveller car which it's reading the location of. I think the differential line could be elastic. So it takes up on both sides when both are slack, then only takes up on the leeward side when the windward side is loaded. So it basically decouples the rams from having to work in synchrony and takes up spare line from the leeward side

[@conorkilroe]

Your videos on these boats is great, thanks so much for explaining these complicated beasts. Do you have a video explaining the changes between last year and this year?

[@MozzySails]

We've not done one yet, but it's on the to do list

[@conorkilroe]

Many thanks!

[@UnkleSi]

Nice model mozzy 👍 like your dedication

[@MozzySails]

Thank you! Cheers!

[@michaelhermans4753]

Complication, simple designs are the hardest to invent and have a habit of working The one they end up using will look very different

[@tiagdvideo]

Brilliant!

[@adamcatlow7496]

I think the part which you say is a take up system, is actually so they can tack/gybe and then end up with the same traveller setting on the other tack/gybe

[@joashparker8271]

You need to watch to the end of the video

[@chriszeiser]

I could think that another effect of this system is that once you release the traveller or turn into a tack, it doesn't slam onto the stop on the leeward / new leeward end of the track.

[@duncanadams6993]

Great content. With a system like that you’d think they’d need the ability to control the amount of differential? As wind strengths change surely the start position of the main after each maneuver would be different?

[@MozzySails]

I think black line across the back is elasticated. So it takes up slack from the leeward side as the windward ram moves. Then, before the tack you can pull some of that slack back in to the system with the leeward ram. Whatever line you leave in the tack up as you enter the tack will be the amount the booms drops down on the exit

[@floodo1]

Fascinating

[@MozzySails]

Thanks for supporting the channel, see you in the new year!

[@jan-udosiefkes8864]

Yep, seemed to me as if they are reducing the hydraulic ram power requirements for reducing crew weight. Thank You for the explaination again.

[@jan-udosiefkes8864]

Without kicker or downhaul there is insane power to the traveller. Here it runs free, more hydraulic power for foiling. Question: The Cunningham thing is really eight tons?

[@MozzySails]

Planet Sail did a good interview with Paul Goodison here which is where I lifted that attribution to him from. They also mention 5-8 tonnes of Cunningham load. kzbin.info/www/bejne/bZzVmZh3g5icbtE

[@peterebel7899]

@@jan-udosiefkes8864 Basically you need the same load on the Cunningham than on the clew to avoid the sail to entangle (possibly me not knowing the English term: putting the sail material out of angle)

[@peterwor]

Great diagramming in the video! I'm still a little confused by the main trimming on these things. I do think there's a better way, need to deep dive into the rules before I voice my idea.

[@MozzySails]

come back to us, we're all about ideas!

[@375dash]

Your final iteration seems to make sense - that floating tie-bar should always move all the way to windward after each tack/gybe and stay there. Self-tacking but with the ability to independently (pre)set the stop point on each tack. Would definitely use less power than driving the traveller across during the manoeuvre. But... Squinting at the sailing clip at about 5m45, when they let the traveller down to leeward (all the time staying on starboard tack), I seem to see the port/leeward end of the tie bar moving to windward. Starts about two hinge segments from the end, moves about another two segments inwards. I can't figure how this could happen, but I'm sure I can see it. I can't pick out anything on the starboard side.

[@MozzySails]

I think it could be elasticated. So that it 'takes up' slack from the leeward side when the traveller is eased. This would decouple the two rams so they don't have to be run in complete sequence

[@375dash]

@@MozzySails Of course! The bit I was missing is that it isn't actually under tension due to the traveller loads. It can just be a pretty light spring to keep the lines tidy.

[@MarkDenovich]

It initially reminded me of a “corexy” mechanism which has been become popular in the 3d printer market.

[@MozzySails]

Not heard of that, do you have a link?

[@MarkDenovich]

@@MozzySails “corexy explained” will find a few videos on YT, if my comment with the links didn’t make it to you.

[@caswal]

I was thinking the same, looks a lot like Corey, to allow clew/foot tension control with the traveller hinge. But this doesn't look strong enough for the forces involved.

[@MozzySails]

@@MarkDenovich thanks... heard it called Core XY before and didn't put 2+2 together

[@cliveclapham6451]

Mozzy sails l don't know anything about sheets and mainsails or Cuminghams, but l like your jumper🎯❤️

[@MozzySails]

Thanks! It's one of my favourites!

[@cliveclapham6451]

@@MozzySails ahhhh, would it be too rude to ask where you got it? ❤️

[@nateverge1167]

I don't think it's a "differential" or self-tacking main. I think it's just a bungee to take up the slack when they drop the traveler. If you coupled the rams like that you'd probably break something if you had both rams on all the way.

[@SimpleClearHelpful]

Right on

[@johntailby3629]

I guess this allows the traveller to be 'self tacking' but allow it to not be set symmetrically on both sides. Do we know if the rams are being adjusted the same amount (meaning that the traveller position will be symmetrical on each tack) or one pulled on more than the other (meaning that the traveller will be assymetric on each tack). I'm struggling to see how this is better than using one central ram and using a system similar to a solo dinghy traveller (the self centring version) unless of course the rams aren't being used the same amount on both side...

[@GordonjSmith1]

As engineering professors always say 'build a model'!

[@onnayoung7699]

Its not quite the same but it reminds me of the underdeck stuff on a Far 40, not quite the same but does the same thing.

[@tomosorio7530]

Surely the drag from deck mounted traveller is monstrous disadvantage. The perfect air brake?

[@MozzySails]

I think they'll put it recess in the deck like Luna rossa, american magic and ETNZ have done. I guess they just put it on deck so its easy to access and modify on this test platform

[@tomosorio7530]

@@MozzySails Ah, thx. Significant structural modification, if unplanned, but that would explain pivoting track, which perhaps could be achieved simply with bearing design and soft shackle.

[@mikemanger-bc8zb]

Hi Mozzy, fantastic analysis of the poms ,I’m a kiwi , and constantly fascinated by how bad the poms are at the americas cup !!or is that changing with the Mercedes’ approach!! Maybe I’m missing something here but all that gear in my view is a red herring just to get you off track . My view on this is that there is a different system under the stern not seen yet , I mean fair dinkum just on windage drag it must muck up the air flow off the back of the boat negating the accuracy of their supposedly so sophisticated sensor systems .. The recon team commented on their boat in the light in displacement mode looked sticky and unstable ? Come on poms have you not learnt anything form the last cup ? Mozzy see if you can see deeper into their smoke screens and mirrors mate

[@MozzySails]

I actually don't think there is anything else hidden. It's pretty ugly having it all on deck like this, but it looks like it's system at least three of the other teams are already using. I guess their thinking is that it's quicker to alter/ service

[@375dash]

@@MozzySails It's not like there's anything else about that hull that suggests they've tried to optimise for aero drag at this stage, so agree, may as well make it easy to access. "Design a carbon fibre monocoque structure which slips through the air easily" may well be something a team full of F1 designer/analysts is comfortable doing entirely in simulation, vs needing to calibrate models for hydro and sailing loads.

[@harken9978]

now where did you get that light in the background? i love it!

[@MozzySails]

pretty cool right? I made it myself (with a bit of help cnc-ing the shape from Tom P)

[@harken9978]

@@MozzySails Awesome! I might just have to give something like that a go my self!

[@rydenkaye9735]

I’m not sure if im missing something (i must be) but it seems like you can’t trim the traveller above the centreline with this design no? I remember in the last AC they often raised the traveller to windward especially on the downwind legs

[@MozzySails]

Watch from 9:30 . I pull the traveller (back thing) up past the centreline to the windward side, which is the side I am pulling on.

[@carbonarne675]

A lot of work went into this

[@MozzySails]

Too much for a 10 minute video 😆

[@musicbylobo]

I'm just sitting here squinting to see the secret image on your jumper

[@MozzySails]

🤣

[@BobUhl-tm5fh]

Why can't the hydraulic accumulators be replenished by the sailing process? Possibly a turbine at the end of each foil or sail to harvest some of the end vortex?

[@Toob41]

Drag? Just feed the cyclors more steak.

[@keithc5729]

I always leave a coment on Mozzy Sails videos to help the channel.

[@MozzySails]

Thanks Keith!

[@keithc5729]

@@Toob41 Petty troll.

[@seacoconut]

Hard to tell without knowing what the ram circuit is paired up to

[@GlitchNectar]

Didn’t realise Marlow did Excel jumpers. Or would that be XL?

[@MozzySails]

I have had a lot positive feedback on this jumper! It's definitely got more stretch in it and a higher wool % than Marlow excel!

[@Kiwisail]

Obviously Ineos are not too worried about aero drag from the hinged traveller...or maybe they just couldnt be bothered engineering it into the deck like LR & AM.

[@MozzySails]

I thunk the latter. There is lots just bolted on to the deck, which for easy reconfiguration on a test mule makes sense I guess. Not pretty, but means we get to see lots of tech 😀

[@quantumvortex3942]

👍

[@dadcooks1347]

👍👍👍👍👍

[@MozzySails]

👍

[@HS29USA1051]

Can anyone figure out a way this works for a boat usually trimming its traveler above centerline like most modern racing boats?

[@MozzySails]

this does allow trimming above the centreline

[@HS29USA1051]

@@MozzySails But if tacking from a windward traveller position to a windward traveller position will it auto tack?

[@MozzySails]

@@HS29USA1051 it will still drop to leeward on the new tack by the amount of line tacken up on the old leeward side... if that makes sense?

[@HS29USA1051]

Yeah perhaps I’m not being clear. I’m wondering if anyone can imagine a similar system where the weather sheeting position of the car is replicated to weather on the other side of the tack. Effectively it would be fighting the load on the traveller car rather than using the load to replicate car position.

[@MozzySails]

@@HS29USA1051 I get you now. Not sure that's possible. Would certainly need some energy input to pull it up to the new windward

[@ewantheboat]

The concept of the diffential isn't new , I've certainly never seen the way ineos have done it ,many many dinghies have this sort of diffential when they tack ( lasers and nearly all dinghies with a free moving traveler )

[@igbc176]

Where is the purchase? there seem to be as much travelling for the piston as there is for the traveller? its all for nothing?

[@MozzySails]

There is an inverted 3:1. So both pistons move 1/3 the distance of the traveller

[@dmurphy1578]

Did not look great the other day.

[@uflux]

Why not just do it directly with hydraulics. Lose the string

[@MozzySails]

I think probably tow things. 1) getting fast enough rams... not that fast enough rams don't exist, but on the AC75 all sail controls are powered from the same hydraulic accumulator. So high tension items like mainsheet and Cunningham need to operate with similar flow rates to comparatively low tension controls like traveller. So to then get the actual speeds you need you have to use inverted rope purchases unless you end up using up to much oil volume and pressure unnecessarily. 2) might be a space / weight issue. Better to have the heavier systems further forward then linked with comparatively lightweight ropes and pulleys

[@nroose]

Seems like you didn't trim your model to demonstrate that trimming it will reduce the travel of the traveler. Like a self tacking traveler!

[@SunsetWingman]

I dont see the point in this at all. Just sheet it like a normal beach cat from the middle and youd only need 1 ram