An extreme take on the rule, at odds with other teams and with plenty of mystery still to be seen, this could be the most interesting yacht of AC37, but is there any indication it's brutalist style with be fastest?
Recon video and photos credit to Recon Photographer / @America's Cup
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This is the only place to go for AC stuff. It is pretty esoteric, but he nails it. Thank you so much Tom.
For sure, especially compared to the peanut gallery at the New York yacht club
nahhh... vittorio d'albertas, sail ring. much more objective
Totally. ✅💯
Thanks Mozzy. I think it would be forgivable if you are an INEOS fanboy!
Always a great video! I am now constantly looking forward to the Mozzy Sails video when any new boat or big update comes out
Me too, im actually disappointed when its not straight after, but understand why it isnt! More content from Mr Mozzy!
Love the theories. I hadn't thought of what you said about volume fwd > AoA > Bow down > big skeg. Rudder theory I would tend to think you're spot on!
Wow Moz! What a theory! I love it. Never hold these ideas back. Incredible. You are definitely onto something here. Ineos might well be pissed that you outed them, though clearly no other team will be able to follow this at this stage. Well done bruv, you are the absolute GOAT of modern AC analysis!
I've been simultaneously a) eagerly awaiting this b) been impressed with every passing hour that you've shown restraint, expecting consequently superior analysis 😊. Right or wrong, its great that you've hung it out there and formed a fascinating hypothesis and not given a dreary 'commentary by committee'.
Glad you enjoyed it!
These boats are rigged with mainplane and tailplane, nut in an aircraft they get longitudinal stability by using the tailplane to press DOWN relative to the mainplane. It the tail is designed to lift it'll need constant adjustment to keep a steady pitch.
@@bobwalden5853 I think that was part of the problem with Patriot, or more so with Defiant, as the had the crew far enough back that it seemed they were relying on a not insignificant degree of rudder lift.
@@weatheranddarkness I think you've got the problem sussed
I like the bravery on the INEOS team this time around, no one wins the cup being boring!
I've been waiting for this one! Cheers Mozzy, another great video.
That's a really interesting take! I have to admit that I thought "damn the brits have struck out again" but now that forward hull section and the skeg design make a lot more sense. Either they'll surprise everyone or keep their dismal track record. In all honesty I hope they do have a winning boat this time.
Well Mozzy having just read the Sail Web recon report on Ineos Britannia towing trials it seems your suspicions over the design innovations and rudder righting moments are bang on. Congrats on the insight and to Ineos on a design first that could prove as radical and decisive as Alan Bonds, Australia 2 AC winning winged keel
We live in hope....
The problem with having the rudder pull "down" is that it adds trim drag. One way to think of this is in terms of "net lift" and "gross lift". The net lift is the vector sum of the rudder and mainfoil lifts, and must always be equal and opposite to the weight of the boat. The gross lift is the sum of their absolute values, i.e. the total amount of lift that all surfaces are generating, regardless of direction. When all wings (rudder and mainfoil) are pushing upwards the gross lift is equal to the boat weight. When the rudder is pulling downwards the gross lift is larger than the weight of the boat, because the mainfoil has to provide extra upward lift to offset the rudder's "pull". gross_lift = boat_weight + 2*rudder_pull. This matters because every wing produces induced drag in proportion to the amount of lift (whether "push" or "pull") that that wing generates. This means that induced drag is proportional to the gross lift, not the net lift. By increasing gross lift a downward-pulling rudder increases this induced drag. As you point out it also provides higher righting moment, which allows the sail to generate more force, and maybe in some conditions that could overcome the increased induced drag? My intuition is that for many situations the optimum would be a design that's as perfectly balanced over the mainfoils as possible, and the rudder produces no lift in either direction. That would provide the greatest possible righting moment without increasing gross lift and therefore induced drag. That's certainly true for aircraft, where you get best efficiency by balancing over the wings (neutral static stability) or by getting positive lift from both wings and tail (statically unstable).
so it would possibly be good in a narrow window?
@@spare9434 That’s my take on it. Whether that’s a low wind window or high wind window…my intuition only takes me so far! Over to the intellects, for their hypothesis 😊
@@breakinghabits_II so like some formula 1 cars, it could lack the ability up operate in a range of conditions
@@spare9434 But unlike F1…this has a set position for its rudder. Is it set for a large range of conditions or just one? What Merc have done with their front suspension (made it moveable up/down and can be set for a specific track) could be some inspiration for the sister team Ineos for their rudder. Perhaps have a couple of positions to suit the weather conditions of the race.
Isn't there an assumption here that the original rule and placement of the rudder as far after was by default correct, maybe Ineos have determined that this may not be the case. Far from an expert here but I can't believe that such a decision would have been a huge consideration for the designers. Guess we will see soon enough.
Cheers Mozzy. Great to have your input on this! Your channel is definitely the first stop for information, concepts, and analysis. Thank you. I really hope the INEOS boat is competitive!! They need it more than anyone to show they can.
I enjoy your analysis my friend. So looking forward to seeing them all out together on the water.
You and me both!
Great analysis mozzy best in the business
Fascinating analysis dude, is why I keep coming back to your channel, keep it up
Oh Mozzy, I hope you're right. I just cant shake Merc F1's involvement and their utter failure at producing a competitive car for 3 seasons in a row.
This was a terrific analysis. As a longtime board builder (surf, wing, kite, SUP) and now a small-time hydrofoil builder/designer, I love your detailed analyses. Some input: They seem to have taken inspiration from all of the board foils out there - all of them work on the principle that the aft hydofoil creates a downforce, that sets the AOC of the horizontal lifting wing. The riders then shift their weight forward to keep the bow down, so the little "airplane" stays in take-off mode, but doesn't get ventilated. By moving the hydroplane/rudder closer to the lifting wing they have created a much smaller "wheel base," as you pointed out. This will give them a great advantage when rounding the marks - since they will be able to sail inside of any boats forced to take a wider turn. This ability will be somewhat mitigated by having a heavier swing-weight in the bow. Also, I've been pointing this out for years, but I don't see the point of such a displacement style entry on a flying boat - it just creates a "stumbling block" should they ventilate a foil at speed - causing an abrupt stop and pitchpole danger. But all that said, I love the innovation - there are so many more ways to utilize hydrofoils than what has already been designed. I'm about to file my 3rd patent on hydrofoil designs - very very exciting stuff!! Thanks for the detailed info! - it helps me to shape my own (more radical, biomimetic-inspired ) concepts.
Great analogies. Foil riders also generate more foil lift by (body) weighting the leading edge of the foil dont rhey? Also, when an AC75 nosedives it might be nice to have some buoyancy in the nose😂
Could moving the rudder forward decrease the turning circle (ie, tacking arc) of the boat? That would make Ineos more maneuverable. Otherwise I don’t see much advantage. More downforce equals more drag equals lower speed.
Excellent presentation. Much appreciated. Looking forward to all your other analysis
Well well, an radically interesting looking boat. Lots of great speculations.
Amazing. Been waiting for this. Love it keep them coming.
Ha been waiting for this vid! Thanks man !
Love your thoughts mate, cheers for the sharing of your knowledge in relation to exiting times.
I imagine Barcelona swells , with risk of momentary losses of 'traction' on underwater surfaces would favour balance and discourage the downforce bias you propose. But who knows, I'm certainly no yacht designer :). I suspect this team will exhibit strengths and weaknesses that are more extreme than other teams. Intriguing eh ?
One Italian expert thought it would get on its foils super quick compared to others. But in other aspects he wasn’t convinced. Time will tell.
if anything waves favour a boat balanced centrally over the main foils unreliant on downforce or lift from the rudder, because it's easier to keep the main foils submerged. we've seen it already in the f50's where losing rudder downforce on mark roundings in high wind/wave conditions is probably the leading cause of pitchpoles. so relative control will come down to how far each team is off centre balance, if ineos is less far in front than other teams are behind they should be less susceptible to that issue
@@rydenkaye9735I would have thought that a boat that pitches further forward would be more susceptible to pitch poling, especially if the rudder is pulling down, no?
@@jasonpickens9839 yes, that's what i said. the relevant factor is the degree of pitch the boat naturally has, not the direction, so if the ineos boat wants to pitch forward less than other boats want to pitch back it will have better control. but if the ineos boat wants to pitch forward a ton they will have higher risk of pitchpoling because if they lose rudder they're going down the mine. if you lose rudder lift instead of downforce it also often results in a pitchpole fyi because the boat pitches up increasing the angle of attack on the main foils making it jump and then crash down so it's not really like one is worse than the other
@@johnmartin7158Likely to be the opposite but if so then it's a world beater.
Thanks - I've been waiting all week for you to tell me what my opinion on the boat is!
Brilliant analyses as usual, big thanks!
Gee! I don't know. Saw the New Zealand boat yesterday and the yacht just flew. Really amazing and just built for speed.
I might go down to the CBD on Monday and have a nosey at her.
Flew? It's a freaking missile.
@@jamesaron1967 How can you tell?
Fantastic breakdown and analysis. Very enjoyable and thoughtful video as always!
As a Kiwi that knows nothing of sailing....I love watching Mozzy Sails dissection of the available footage of these boats....I still know nothing of sailing, but, you make it sound so exciting....
Great video Tom, I have been waiting to see what you would have to say about the new INEOS boat, as usual you saw so much more than me from the same photos and video and I love your explanation of what we have seen, it will be interesting to see how it pans out.
With all the new boats being revealed and at the same time, the intrigue before the matches will start, this channel is the only place for the funs to be!! Thanks, Mozzy, always great insights! Looking forward for AM boat uncovered and some new update from the rest of the teams
Luv these insightful video’s, keep them coming
I just love this - the intrigue grows! Great analysis which really adds to the drama. Can't wait to see them on the water side by side.
Great video man! You said a lot of interesting things.
Thank you for your efforts 😮
Been waiting for this one , keep em coming.
You got it!
Thanks for sharing your ideas on the INEOS boat. It is very interesting given the partial reveal of the AM boat and the speculation about their crew placement.
Thanks mozzy
Really like the way you do these graphical annotations (as most of the terminology is alien to me). So thanks for taking the time and trouble. Cheers.
Great analysis, cant wait to see this boat fly, then compare and contrast its performance against the other boats.
Always look forward to hearing your thoughts and those of your mates. I'm not a sailor nor an engineer but you make understanding these boats accessible. I love the racing and having an understanding of what the teams may be trying to achieve with the yachts adds to the enjoyment. Also, as a Kiwi who has lived in England for so long, this team and the Kiwis interest me the most. I will always support England where it doesn't conflict with NZ.
Another great video, cheers mate, looking forward to you and the boys doing a comparison of boats. Will be interesting to see etnz foils
Thanks, sir! Excellent thoughts.
Great conjecture. This fascinates me. I have been somewhat baffled by lifting tails as that was abandoned in the very early days of aircraft development because it is very unstable. My wingfoil rig has a negative lift tail like a modern aircraft but these boats balance on the leeward foil and rudder like a three legged stool with a leg missing... in a wind storm.
Modern aircraft do indeed have tailplanes that pull down for takeoff and landing, but in cruise the tail is offloaded by moving the CofG for efficiency.
Thanks for a really interesting take on the Ineos very different underbody and rudder configuration.
OK mozzy. We haven't forgotten your fan boy review of the last lemon ineos launched.
You pommies can't help yourselves when it comes to this.
Hope Mozzy is right in that it is a better boat because team Ineos needs it. In the standard 40's their sailors dissapointed.
Mozzy gives an analytical assessment of what the designers may be trying to achieve, you call him a fanboy. Very good mate.
As mentioned in the video, INEOS do their own thing and while they may not have pulled it off last time, not many challengers do first time around. It's a bold departure from the norm, which I think is worth getting a little excited about as a fan, more so if you're British, but also a little apprehensive about if you're not, like this kiwi 😬
Your hurty feelings caused by the empire?
Will be VERY interesting to see how this races, it would be great to see boats with vastly different operating 'windows'. Ie Ineos great in high winds but not in lower winds or something like that so the racing could be super interesting.
These are such high apparent wind machines that there is practically no light air - over the sails and deck.....except when taking off. Surely they looked at rules re minimum windspeed for racing and planned accordingly.
The lump on the bow should henceforth be known as the goiter, it will be interesting to see if the Ineos rudder causes more drag than the gains it makes. Its ok to be a fan of your own team , you get a free pass for life. The winner is sailing and designers, look at the effect all this has had on sailing world wide, we can never go back now. The greatest move of all was to put foils on monohulls, the last bastion of the luddites, it used to be catamarans that were shunned, when foils were added it was still another category of sailing and avoidable, but now its on monohulls there is nowhere to hide from progress.
I too was wondering about the increase in drag from the rudder. Surely less leverage and greater bite would offset the gains. But then here we are and INEOS have built it that way. And so far they're the only one to diverge from the relatively coalesced designs of ETNZ, Luna Rossa and Alinghi.
@@benjaminweslake4174 it could be another W foil or an actual advantage 🤔
Fascinating. Even I understand what you are talking about which shows how clearly you discuss a really complex topic.
We need a new Ineos video Mozzy! I’m checking every day!
I am so glad I found this channel to help explain these designs. Thanks for your work. I wondered if the airflow over the boat could be used for down force at the rear making use of the rudder gear housing. This would explain why the structures extend further back along the sides of the deck 'needlessly' as they provide an end plate for the airflow steering it onto the rear wings.
Good insight
Another great review, Tom. Let's hope, for INEOS's sake, you're on the right track.
Love your analysis mate! No one else is doing this! You need a job with one of the AC teams :)
Superb analysis
That is a such great analysis Mozzy and its got me super curious for the launch and testing ! This would maybe explain why they have not disclosed the rudder yet.
I was a witness to the first foiling AC in SF and been windsurf foiling since then. Your explanations always amazed me as they describe foiling principles I myself experienced. Windsurf foiling is pretty similar to the way these boats behave. It’s so cool to see ineos pushing innovation and I hope they are onto something here. I am curious about Ineos ride height in the Barcelona sea state. Either a calm breeze on flat water or crazy tramontana with big gusts. Can’t wait!!!
Wonderful technical discussion for a non technical listener👍👍
Tom's analysis is an order of magnitude better than any other I'm aware of. Fascinating stuff.
Brilliant. Keep trimming. Thanks
Brilliant analysis worth waiting for Mozzy! Recon imagery you rightly point out isn’t hugely enlightening on some key features. But there seems to be a lot of very subtle detailing on the underwater hull form forward bustle, as some others have suggested like a large cetacean. Some interesting analysis on this three part hull form on the Italian channel sail ring; mostly concluding this achieves easier lift off and greater manoeuvrability. Love to hear your thoughts on this… well done, great channel delighted you continued after last cycle ❤
awesome analysis - tow tests supports it too - cant wait till she sail tests mid week
Hey Tom, Many great memories from 15 years ago when you used to coach me in Toppers 😂 love your work mate, can’t wait to see how this all pans out!
That takes me back!
a cup fan through and through
Not sure I'm convinced but I love the conversation. You are very clever and I enjoy that more than my sinicism about English yachts in America Cup races. Fingers crossed as always!
Mozzy, I love the analysis on this design!!! There is a ton of merit to what you are describing!! I’m eager to see if the design proves itself!!!! I appreciate your thoughts!!
Thanks man. If you are right then finally we have something interesting and not just variations on the NZ boat from the last cup.
Any first reactions to American Magic? They seemed to have gone a totally different direction with design. Even where the foil connects to the boat there's not really a bulge there.
Interesting, but I believe one key point about the rudder's forward location has been overlooked. That is, moving the rudder forward decreases the boat's turning radius, potentially providing the opportunity for faster maneuvers, plus a tactical advantage when rounding marks in tight quarters with other boats.
No the role is to increase righting moment. Rudder moved forward means you loose torque to pitch=you need higher «effective lift » to pitch . So if negative lift is needed on rudder to maintain flight (which seems to be the case with crew forward and foils backward) , the effect of forward rudder is to increase righting moment!
Good Luck GB. As they say in Hollyweird....Break a Skeg!
Having watched the video of the tow test I think you are bang on about the rudder pulling down to lift the nose rather than working as a lifting foil
I'm happy to see Ineos spend $100 million on seeing if a risky design idea works in practice. If it pays off, then the whole world of foiling boats will benefit. If it fails, then Sir Ben will have to find another billionaire for AC38. I'm sure when RB3 pitch polls into the heavy barcelona sea state - it will get lots of tv coverage around the world.
The catch 22 is that you don’t win by building the same boat as everyone else
Sir Ben, you might have said, will fall on his sword?? 😂
This must be Bens last chance.The fastest boat win and team GB consistently produces slow boats
Just yesterday I was watching a couple of documentaries about tailless aircraft/jets and I day - dreamed about the possibility of how AC boats could minimise the rudder structure and modify its role - I guess I am about to find out! Insightful as always - my thanks!
Some thoughts: That high volume lower hull seems to mirror the evolution of displacement catamarans. Most modern displacement, and foiling cats have similar square shaped sections to reduce wetted area and promote lift (think NACRA 17 and the foiling A Class, though these do tend to carry their fullness aft). This is as opposed to the deep V sections of the other boats launched so far which are more reminiscent of the early cat designs like the Hobie 16. Perhaps Ineos anticipate light winds and have prioritised getting up on the foils more quickly (a reaction to their previous AC experience?) - but, frontal section and slamming, Mmmmm! Also, that skeg ending forward of the rudder bothers me - Having raced Dart 18's that have a similar skeg, a major problem was that, at high speed, a trail of bubbles would form at the tip of that skeg without warning, hit the rudder blade, and cause it to instantly cavitate leading to a major loss of control.
This was similar to my thoughts. A couple other theories/rank speculations. Getting the boat out of the water in low or rough seas and keeping it out of the water may just be what they are targeting overall. The other thing these changes make, beyond moving the CG, is that they reduce the rotational inertia of the boat which has dynamic considerations - for example potentially improved maneuvering and tacking. Looking at the shape and where they have shape I partially wonder if there is some effort at getting aerodynamic ground effect/compression lift. With the CG shifted more aft on other hulls that may not matter, be possible, be pitch stable because the center of lift would be far forward as you make the air work...but if you can make it work and then move the CG to optimize around it they may see an advantage. everyone else seems to be aimed at a combination of managing clean airflow under the hull and I'm a little surprised we haven't seen more high risk tradeoffs to use that space given the high percentage of time spent on the foils. To the forward mounted rudder - its worth considering whether they are seeing the extra potential leverage (and reduction in trim drag) as a false path to chase. Moving the rudder forward reduces its power, but that may be preferred in certain conditions. E.g., you can make more precise control movements when the same angular adjustment creates the same force but at a reduced lever arm. Another potential point is simply - if it is pulling down, the consequences of it leaving the water are far higher. In that case the small increase in trim drag may just be the cost they pay at their optimal point to keep the boat upright. In sum, they seem to be chasing a different optimum point - there are always multiple. If you think about how right ETNZ has gotten it several cups running it may simply be the consideration that chasing their path can only leave you chasing them and taking risks and seeking other optimums is the most likely path to beating them.
Last cup they went all out as well and built two tanks , the fact they still haven’t launched yet makes me wonder more , just seems a long set up stage
This is what happens when Chat GPT is asked to design a boat.
Oh, yeah, I'm completely on board with this! In the '60s-'70s I was a huge fan of the Can-Am series, primarily because Jim Hall and his wildly innovative Chaparral race cars...
Great 1st impression. Acctually thats how rudder work on airplane, they counter lift from main wing to trim and add stability. Like that short wing rudder length (you must invent this wording for short vs long wheelbase for yacht), IMO see how SrBenA race, mostly He Tac more then Kiwis with max angle to increase speed than distance (mad race mode ON). So I guess enginneer just accomode that style, bulky underbody I reccon all heavy stuff place in this section to lower and more centre COG (more stable on turn and Tac) with short and aggresive balance allow SrBenA to turn faster on Tac and do more Tac. But loose more on top speed, increase acceleration reduced top speed
I love the new lift distribution proposed by Ineos. It unloads the rudder (which may be in negative lift) = increased righting moment. Like @Mozzy Sails, I think this is the idea behind the design. Just brilliant. On the other hand, I think the abrupt hull line is likely to generate more drag.
Thanks for the analysis Tom - really fascinating theories! Just thinking about the fore-aft balance... if they were sailing agressively bow-down I guess that the rig tilting more foreward would have the effect of taking the COG forward, then negative lift from the rudder would come into play to keep the boat trimmed, so we could maybe expect to see that sailing mode as the boat becomes overpowered?
The full bow below the waterline is something that stands out. Noice design bois. Good luck
Great analysis yet again. I thought it was suspicious that they haven't shown us the rudder! Those foils look very high aspect, too. Bringing the lift and mass centres closer makes the boat more twitchy, less stable, so smaller control inputs have more effect, with less drag. The Barcelona wind range means they'll probably have more power and lift than they need, more often, so turning some of the lift into righting moment makes sense, also because in light winds, the rudder can go back to lifting mode, as the extra righting moment isn't needed. ETNZ already showed in ac36 that controlling the foils to trade between lift and righting moment is key to going fast. It's the same as shifting your weight around in a dinghy. That hull shape has me scratching my head, though, so different to ETNZ, which looks to be the right shape for dealing with the waves.
Ineos is either going to win the cup or come in dead last.
Meh. It's perfectly possible they might be competitive but not win it.
Not a bad strategy in a competition where famously where 'There Is No Second'
Just like in cycling and F1...
Yah, either Ineos have it extraordinarily right, and the others have it woefully wrong or vice versa. Time will tell if the experience of Italy and Team NZ mean anything in their designs. Cheers.
@@jaysdood Or the other way round. If Ineos wins the challenger series and handsomely win it, Team NZ will have their work cut out.
Wow, the waiting was worth it!
Thanks Mozzy, as always a very interesting briefing. It'll be a bitter blow if Ineos once again fall short of the competition in design terms. Your theory raises a couple of follow up questions. All teams have placed the main foils to the back of the measurement box so they do most of the lifting, so is the approx 5% difference in rudder lever arm between Ineos and others a different concept or just fine tuning of loads. Secondly, in AC36 it was proposed that take off was promoted by the rudder lifting the stern out first to reduce drag, build speed to the point the main foils lift the boat proper.. Presumably the rudder setup for down not up will be a total bummer in light winds.
Enjoy your blogs and I also enjoy seeing where the technology (in addition to team work + strategy) goes. These foiling yachts are a bit similar to aircraft where the main foils are like wings and the rudder also serves as an elevator to control pitch. For aircraft COG really matters. I used to race model gliders on the hills here in NZ, and one of things I used to do when building was to get the COG as far back as I could get away with (i.e. not unstable to the point that its impossible to fly smoothly). Reason being to minimise elevator drag. Used to make the glider harder to fly (less stability and very much had to be flown actively) but overall it often gave me an edge when others were flying similar gliders with more conservative COGs. Same when dynamic soaring - in fact if you had the COG too far forward you may run out of elevator control while pulling high Gs. Although you can go too far aft and I did lose one glider (came apart mid air) due to divergent pitch oscillation as it accelerated through 220 kph. Normally its wing flutter and very turbulent air thats the enemy.
Keep it coming Mozzy, great as always. Love the different styles of boat. Luna Rossa seems like the most traditional boat, Kiwi's is how do we make a boat that is fast when foiling, Alinghi is lets make something aerodynamic and racey that still looks like a boat and Ineos looks to have tried to forget it's a boat and design a flying machine that may need to float occasionally.
I like uour analysis: be interesting to see if they can control it.
Before claiming rudder positive or negative lift you may want to study a few upclose picture of the teams rudder foils. Check which way up their hydrofoil section is. Ps this boat is partially designed by the F1 team that is always one upgrade from catching max 😂
Maybe the center of lift of the foils / boat allows the rudder to have less lift or very light righting (negative) lift, thus taking significant load off the rudder resulting in less rudder drag on the forward motion of the boat. Basically let the main foils do the work and the vertical rudder forces are just used for minor trim.
Very interesting concept. Looks good on paper. The challenge will be development of something that's essentially different. The competition is sailing second gen machines and NZ looks extremely well oiled. Not sure about wetted surface being a problem - the shorter skeg should reduce it and the bulbous bow as well. On the other hand Mr. Ainslie has been successful sailing the GP boats that have a similar foil configuration with the rudder creating righting moment so it may not be as big a gamble as it seems.
Thanks. At least it’s different and sticks to a design philosophy.
If this is the concept that they're going for, I wonder if placing the rudder further forward on the boat was done in order to get the rudder foil to ride lower in the water while sailing with extreme nose down pitch (since the stern would be higher out of the water). Theoretically if the pitch angles that they're planning on sailing the boat at are steep enough, then putting the rudder in the traditional position at the transom would result in a high risk of rudder breaches
If you're right mozzy it means nasty pitchpoling when the rudder cavitates. High risk strategy..
Makes me wonder if in the future we'll see canard style setups, where there is a lifting foil in the bow that maintains pitch control, the main foils are moved back, and the rudder only controls yaw. It would seem to be a more efficient layout, in that all the bodies would be creating lift, and so the induced drag of the lifting foils would all be going towards keeping the hull out of the water.
I love a bit off enthusiasm for Ineos. The computation & simulation at Bracknell must have been 24/7 to work out the performances range which had to include the course likey condition ranges. All clever stuff. Then the design envelope trade off to achieve high speed stability. Manouvre at high speed. Like formula one the start is crucial in a drag race. Ineoes are terrible at starts so they are allways at a disadvantage. Now lets see if it all works & we have a crew capable off pushing it. All we want is a fast start & a competitive chance. This is very compelling stuff. Please do more off a dive on what rescources Ineos used of its big data sets too set its deseign envelope. Computer simulations as we know are much enhanced & the secret sauce to finding answers. All designs are a compromise to performances. Love the video.
Tom, as usual I wait biting my nails for your insights / honest dissection at what we can see. Iam waiting breathless for the US boat. Currently TNZ is getting so much TOW that with their aces in the sleeve will make challengers have their work cut out for them. Let the games begin. Fonty
Are you sure that the rudder of other boats create lift? I think the rudder works like a tail in watersport hydrofoils. A tail creates down force for dynamically stabilising the hydrofoil pitching movement. Like a horizontal stabiliser on an airplane.
What you said about the increased angle of attack in the displacement mode, the bulkier nose shape might also mean that the center of gravity is further forward, relevant for the displacement mode, so that it can lift off at all, confirming your main theory
Interesting. Seems to be in line with the concept from aerospace engineering, that it’s better to be nose heavy than tail heavy. I commented exactly that in one of your previous videos.
Assuming that they want the skeg to close the slot on the waterline I think you are spot on about the nose down approach and the rudder. Will be interesting in the cup as this could well set Rita either ahead or behind everyone else 😊 Only time will tell… Fingers crossed…