Merci 🙏🫶🏻

Thank you ! 🚀 We will 😈

Les foils n'ont absolument rien à voir ici avec ceux de la coupe de l'America. Ici ils ne servent pas à faire décoller le bateau pour réduire la traînée : ils font l'exact opposé en maintenant le bateau au contact de l'eau pour pouvoir garder le contrôle. C'est le kite qui a pour rôle de soulever la coque pour réduire la traînée. Autre ÉNORME différence au niveau de foil, là où ceux de la coupe de l'America ont des problèmes de cavitation lorsque les vitesses atteinte dépassent les 50 kts, ici le profil est complètement différent et pour qu'il soit efficace il a besoin du phénomène de cavitation (Tu peux chercher le terme SUPERCAVITATION sur ton moteur de recherche favori). Je ne connais pas les détails de celui embarqué sur le SP80, mais je ne serais pas surpris qu'avec les vitesses atteintes pour l'instant les foils ne soient vraiment pas dans leur domaine de prédilection, et qu'il se révéleront bien meilleurs quand les vitesses atteintes se rapprocheront des 80 kts. Effectivement les foils utilisés sur la coupe de l'América sont asservis, les plans porteurs ont des ailerons mobiles comme sur les ailes des avions pour adapter la portance et le safran arrière est lui aussi mobile dans l'axe du tangage pour asservir l'attitude du bateau, c'est grâce à tout ça que les bateaux sont extrêmement stables lorsqu'ils sortent de l'eau.

@GimliOakenshield merci pour ta réponse super détaillée, ça me donne envie de creuser un peu 😃

On arrive un peu tard, mais @GimliOakenshield a super bien répondu 😍 ➡️ Une des règles principales pour le record est que nous n'avons pas le droit d'utiliser une assistance électronique ou source d’énergie aidant à piloter ou à stabiliser le bateau. Résultat, notre bateau doit être stable de 0 à 80 noeuds sans assistance...dès la conception, nous avons dû prendre cela en compte et notre "module de puissance", c'est-à-dire notre ensemble "Kite-Foil" s'équilibre mécaniquement : la force du kite (qui nous tire vers le haut) est constamment alignée avec celle du foil (qui nous tire vers le bas). C'est également pour ça qu'on ne vole pas, contrairement aux bateaux de la Coupe : sans assistance électronique, il serait très difficile d'assurer la stabilité d'un bateau volant ! Juste encore un détail, on ne fait pas de la supercavitation mais de la "superventilation" avec notre foil... on aime bien compliquer les choses 😇 On explique nos choix à ce propos dans cet article : sp80.ch/fr/trouver-notre-vision-dans-un-ocean-de-possiblites/

@@sp80record A ce niveau ce n'est pas un détail, merci pour la correction et merci pour l'article je ne l'avais pas vu !

@@GimliOakenshield bien répondu, à part que sur la coupe il n'y a pas d'asservissement sur les AC75 (il y en a sur les AC40). Tous les réglages sont fait à la main (flaps et safran compris), mais l'énergie utilisée pour les actionner provient d'une batterie.

When designing the boat, we wanted to keep the boat symmetrical for as long as possible to be able to adapt to as many sailing conditions as possible... once we'd chosen our sailing spot, we could adapt the boat to perform as well as possible along this particular beach ➡ at present it's no longer really symmetrical, its “kite > kite arm > foil arm > foil” assembly is intended only to be effective on a single tack (with the wind coming off the beach). But, if we were to change the spot for the record, or even adapt the boat to sail (at lower speed) on both tack, we could do so “easily” thanks to its initial symmetry 💪🏼 We'd just have to adapt our power module a little 🤞🏻

An inflatable kite is a bit less performant than a ram-air kite but is way easier to launch and handle in our case : we're launching from the sea, on a chase boat, and with a lot of wind 😅 However, we want our kite to be as performant as possible ➡️ We are designing custom ones that are more efficient than those you can find on the market 😇 You can find more info about it here : sp80.ch/designing-unique-kites-for-the-world-sailing-speed-record/

It has no lifting foil. Only a mobile daggerboard that can create downforce when the kite pulls upward. And a rudder for steering of course. Both have a weird wedge profile that also "work" at low speed but far from optimal.

@@marcrent0n To elaborate, the foil is designed to operate cavetated so it doesn’t have the low drag and higher lift at lower speeds. It gets no help from the suction side.

​@skyak4493 if I get it right the foil is supposed to ventilate instead of cavitation. Air is sucked and a stable air bubble is created instead of cavitation.

@@marcrent0n Yes, I am sure you will get it right and the bubble will be air rather than just water vapor. The thing I always wonder about cavitation foils is the leading edge. You want it sharp to initiate separation, but that would be fragile. Is it possible to have the leading edge blunt enough to move the bubble off the surface without going under boiling point?

Wrong. This is an amazing demonstration of improved production quality. No one minds the cottage industry feel of the start up videos but a true team works at improvement in all facets of its performance. If this clip wasn’t worth a minute of your time…sounds like you’re jealous not to be in the room where it happens.

It makes perfect sense that the the high tech details are not reported free to the public, rather retained at the discretion of those funding it.

If there’s a specific aspect of the physics you'd like us to explain, we’d be happy to dive deeper into the details. In the meantime, you might find this article helpful-it discusses our design philosophy and how we approached the choice of foils sp80.ch/finding-our-vision-in-an-ocean-of-possibilities/. You can also check out this video for an overview of the global concept: kzbin.info/www/bejne/jWrLiaaenN6Dl9U. And for more regular updates, we’re sharing lots of behind-the-scenes content on Instagram and Facebook. Feel free to follow us there! If you'd like to know where we're at today!

@@sp80record The thing I am struggling with is a concept of a terminal velocity based on the lift/drag ratios of the foils. You are using a cavitation/ventilation foil in the water so it is limited l/d. That puts a greater demand on kite performance to not run out of attack angle. So far you are showing a fairly conventional foil kite and I don’t think that gets you to your stated goal. I am excited to see what happens when you apply advanced tech to the kite.

@@sp80record Thx for that. I was unaware that the foil was under control as well. However, I think that the equation v=power/drag doesn’t describe the position on a sailing craft completely because the power is not applied along the direction of travel. The foil produces a force at an angle between the drag & lift vectors as does the aerofoil. When those 2 vectors are aligned no more acceleration can occur however much power is applied. If you know the L/D ratio of the kite and the boat you can work out the fastest speed possible.

I suspect that, at higher speeds, the most parts of the hull will lift clear of the water (wing in ground effect?)

@@twpayne2-3 Mach😂

Merci beaucoup ! 🙏 On a hâte de voir la suite et de vous la partager 🚀

Thank you 🥰 You're welcome to meet the team for a real hug one day 🤗

It's an interesting debate :) Nowadays, the definition of a sailboat is becoming more and more questionable, especially with the developments of new rigs like the wings on the Cup or SailGP. A boat powered by a kite is considered to be a sailboat and can therefore claim to break the world sailing speed record. You can find the record rules on the WSSRC website (www.sailspeedrecords.com/) It is also worth noting that kite racing is now an Olympic discipline, managed by the World *Sailing* Federation (www.sailing.org/classes/ika-formula-kite/)

The foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼 ➡️ of course, the smaller the waves are, the better our boat will perform! For now we're training quite far from the shore to avoid sailing in the middle of the other spot users. But when we'll feel ready to be really fast, we'll get closer to the shore and should enjoy a much calmer sea 🤞🏻

The foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼 ➡️ of course, the smaller the waves are, the better our boat will perform! For now we're training quite far from the shore to avoid sailing in the middle of the other spot users. But when we'll feel ready to be really fast, we'll get closer to the shore and should enjoy a much calmer sea 🤞🏻

The foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼 ➡️ of course, the smaller the waves are, the better our boat will perform! For now we're training quite far from the shore to avoid sailing in the middle of the other spot users. But when we'll feel ready to be really fast, we'll get closer to the shore and should enjoy a much calmer sea 🤞🏻

If you're asking about foiling, the foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼 ➡️ of course, the smaller the waves are, the better our boat will perform! For now we're training quite far from the shore to avoid sailing in the middle of the other spot users. But when we'll feel ready to be really fast, we'll get closer to the shore and should enjoy a much calmer sea 🤞🏻

@@sp80recordThank you for a really good answer, interesting! Will follow this project, wish you the best of luck

The foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼

On reste "plaqué" à l'eau, contrairement aux bateaux actuels (par exemple les AC 75 de la coupe de l'America, qui "volent" au-dessus de l'eau grâce à leurs foils :) )

Thank you so much! 🥰 We're well settled in Leucate (South of France) and the conditions suit us well, so we plan to stay until the record ☺️ Also, we're not making a supercavitating foil, but a superventilating one... if you'd like, you can know more about this here : sp80.ch/finding-our-vision-in-an-ocean-of-possibilities/

On this video, the boat was towed and we did not have our kite on. You can check out our latest ones with a kite : kzbin.info/www/bejne/d2jUpoamoJKbmLcsi=Vp9qWIn8TkGClX20

The foils that you have in mind cavitate at around 55 knots (100 kph), preventing the boat to go faster than that. As we want more speed that what can be done on these foils, we had to think completely differently 😇 Additionally, our number one priority at 150 kph is stability, and flying would be very unsafe for our pilots. So we do have a “foil”, but lifting downward 🙃 It has been designed to anchor us in the water, as opposed to what is currently done in competitive sailing ➡️ at the very high speeds we are targeting, we don't want to fly but to stay really flat on water, kind of like a formula 1. If we go into more detail, the goal is to lift the boat so that it skims the surface just above the waves, we call this "planing” 💪🏼

Actually, we do have a foil, not super-cavitating but super-ventilating 🤓 If you're interested you can find more about why here : sp80.ch/finding-our-vision-in-an-ocean-of-possibilities/

Actually we do have a foil, not super-cavitating but super-ventilating 😇 You can find out more about why here : sp80.ch/finding-our-vision-in-an-ocean-of-possibilities/

En effet! Pour nous, cet été il s'agissait déjà de faire naviguer le bateau et d'explorer son potentiel avant de vraiment accélérer. On ne veut surtout pas tout casser ! Paul Larsen et l'équipe de Sail Rocket ont mis plus de 10 ans (et deux bateaux) pour battre le record, ces choses là prennent beaucoup de temps... mais on s'accroche, étape par étape🤞🏻

YES! Dude I was thinking the same thing. Piranha all the way

Un grand merci ! ☺️

🇺🇸 We're doing the opposite of what you're doing then 😁 ➡️ The controls are mostly hydraulic & mechanic : electronic assistance is allowed only to relay information to the pilots (speed, wind direction, etc.). Any electronics or energy storage helping to steer or stabilize the boat is strictly prohibited, which makes this record a great challenge of engineering and design to have a naturally stable boat during all phases of the record run 🇫🇷 En fait, notre kite n'est pas du tout automatisé et 100% contrôlé par un de nos deux pilotes : l'assistance électronique n'est autorisée que pour relayer des informations aux pilotes (vitesse, direction du vent, etc.). Toute électronique ou stockage d'énergie aidant à diriger ou stabiliser le bateau est strictement interdit, ce qui fait de ce record un beau défi pour les ingénieurs: il faut avoir un bateau naturellement stable pendant toutes les phases d'un run de record 💪🏼

Thank you! 🫶🏻 We're a bit less present on KZbin, but if you'd like to see more content don't hesitate to follow us on our social media and / or register to our newsletter from sp80.ch 🔥

Nowadays, the definition of a sailboat is becoming more and more questionable, especially with the developments of new rigs like the wings on the Cup or SailGP. A boat powered by a kite is considered to be a sailboat and can therefore claim to break the world sailing speed record. You can find the record rules on the WSSRC website 🙌🏻 It is also worth mentioning that kite racing is now an Olympic discipline, managed by the World *Sailing* Federation 😉

@@sp80record a sail boat has sails . Connected to a mast.

For the moment we’re still training and we're sailing far from the shore. We don't want to exceed 40 knots, and our boat manages to do so on slightly choppy water: it allows us to sail at the same time as the other spot users without too much risk 💪🏼 When we will feel ready to go faster, we'll move closer to the shore to have a much flatter sea 🤞🏻

@@sp80record Interesting! Have you determined the optimal reach angle and wind speed? I am a Laser sailor and there are some places I can sail behind a breakwater that is open to steady ~30 knots and that puts the boat up on a plane that is incredible. - (nothing like your SP80). I have seen several prototype kite boats testing here in the SF East Bay out of the old naval air station.

@@jsmcguireIII Our optimal angle is between 95 and 110° depending on the wind strength and the kite size 🪁 In SF, you might have seen some amazing kiteboats, that's were Don Montague is testing all of his ideas... He's actually one of our greatest inspiration! kzbin.info/www/bejne/p6POo5imjsmSq6s