How Did Vestas Sailrocket 2 Smash the Sailing Speed Record?!?!
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- Опубликовано: 27 сен 2024
- In this video we talk about how Sailrocket 2 works, including how it smashed through the 50 knot foil cavitation barrier to break the sailing speed record at 65.45 knots (121.2 km/h) over 500m.
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This channel is criminally underrated. Great job.
Thanks - glad you like it!!!
Despite its limitations, sail rocket 2 is indeed one of the coolest sailing contraptions ever devised.
A spectacular feat of perseverance, engineering, and bravery.
Don't care one little bit if there's only 1 place in the world it can sail that fast. 👍
Well said - I totally agree!!!
It is certainly uber cool, and just the toy for some rich, sail enthusiast, Namibian, who has everything else already
@@alexanderSydneyOz And it does keep the rest of us (non-rich) entertained!
@@alexanderSydneyOz Well.... Vestas is far from Namibian... or even boatbuilders. But they do make offshore turbines, so I bet there's a ton of secret R&D hidden in there, that they could possibly use, and if not, it's still great exposure as masters of the wind. It's big corp budget on that thing, not just billionaire fun and games.
That pass reminds me of the olden days land and water speed runs using engines, just sittin there ready to die.
You explained a fairly complex subject in a way that anyone could easily understand. Well done! I grew up on the Chesapeake Bay and spent the summers of my youth sailing. When I got a little older I was fortunate enough to get an opportunity to sail on one of the Chesapeake Bay Log Canoes. I spent a year racing on the canoes which was a truly memorable time. Going fast on a sailboat is something everyone should do at least once in their lives. If you are ten feet out on a board it's even more incredible!
That sounds like lots of fun - I agree!!!
Great video...informative, to the point, not overly long, and no BS.
That was the idea - glad you liked it!
I watches the whole Sailrocket project from start to finish. I was amazing the ups and down the crash and the indomitable spirit of the team. Thanks for sharing their triumph with us.
That must have been an amazing journey for the Sailrocket team!!!
Thanks for this. I'd stubbled across videos of SailRocket years and years ago, but never really understood the tech until your explanation. Fair winds to you!
Glad you enjoyed it!
Yes, this channel is really criminally underrated. Great job.
Thanks so much - glad you like it!!!
I've been fascinated by Sailrocket 2 for ages, and tried to watch all the videos I could about it, but I hadn't understood the mechanics of how it worked until I this video. It's way weirder than I thought it was. Great video!
Thanks so much! I was also disappointed that other videos of Sailrocket didn’t really explain how it worked, so I made this video! Thanks for watching!
Yes, but it's really a specialized version/different arrangement of how all sailboats work. It's also very similar to windsurfing (with the rigid wing), which I recall is also very popular (cor setting speed records) in that location in Namibia.
It may be a one trick pony but man is that a cool trick.
That’s a great way of describing it!!!
This is great content. I like easily consumable bites of pure knowledge like this. Keep up the good work!
Thanks - glad you like it!
I think lack of ability to even travel in 2 directions, nevermind turn, definitely puts this in the 'contraption' category
Yes despite being very good at one thing there are definitely some limitations!
I am from Walvis Bay and did articles on Sailrocket project for local newspaper. Larse and Helena were on project. Wonderful people and so were the other people who worked on Sailrocket.
How cool that you got to meet and work with them!!!
As a speed sailor myself (TriFoiler #23 "Unfair Advantage"), I've been watching Sailrocket since the beginning and admire how fabulously bonkers it is. I'm glad you touched on the (obvious to anyone paying attention) one-tack limitation - scream down, tow it back. Great little vid.
Glad you liked it! I couldn't help but look up your boat and it looks pretty cool too!
@@SailingTipsCa The Hobie TriFoilers were amazing. It's kind of sad that they don't have many successors/imitators.
@@LoanwordEggcorn Yes creating a small foiler for the "masses" is a bit of a challenge! I think there have been some decent attempts with the Waszp, UFO, and Stunt S2, but around here (Pacific Northwest) I see mostly foiling kiteboards.
@@SailingTipsCa The advantage of the Hobie TriFoiler is that it's probably more stable and relatively drier than a MOTH, etc. It's more like a foiling regular small multihull and not as much of an almost windsurfing/kiting/dinghy type wet experience. Hopefully it also spends much less time broached or capsized.
You should do a video on the attempts to beat sailrocket by syroco and sp80, or others if you can find them. The concept of force alignment is clearly present in their designs, but with a kite and downward foil instead of sail
Good idea! Paul Larsen (Sailrocket 2 skipper/pilot/astronaut) speculated that the Sailrocket 2 record would be most likely be broken by a kite-driven tension device!
I was a ramp agent around private jet for about 5 years. I always noticed that some of the jets had square trailing edges on their wings, but I was never able to figure out why or find anyone who knew why. It bugged me for years. Thanks to this video, I suspect that the big jets (think Gulfstream) exploit a super cavitating foil as well. This video was an epiphany to me. Thank you for this upload.
Aeronautic engineers apply all kinds of tricks! Glad you liked the video!
cavitation cannot occur in air because air is already vaporised.
Thanks for another wonderfully clear explanation.
For the relatively static conditions there, one could have a teardrop ladder foil above the cavitating foil to get up to speed sooner. Might cause some drag in wave crests though.
Good eye! I'm pretty sure I've seen some Sailrocket foil photos that do show a sub-cavitating lifting foil section above the cavitating foil for this exact purpose!
@@SailingTipsCa Yes, and I may have been vaguely remembering this when when I looked at Sailrocket many years ago.
Ladder foils were pretty common in the early days of hydrofoils, but have pros and cons, like anything else.
You ain’t kidding, super cool!
Probably also slightly terrifying to sail it that fast!!!
That thing isn't sailing, it is flying just above the water and dipping its toes.
That’s one way to describe it!
It's how it's attached
It's not flying it's falling with style
It's foiling.
@@VictorBianculli Yes except the foil is keeping it attached instead of lifting it out of the water as is more common!
Very correct explanations. I was at the Christianing of the SR2 in Cowes. When i saw the foil, i said; no way. But Paul Larson tried to explain it to me for the first time then. Creasy stuff.
That must have been cool to see before she was shipped off to Namibia!
Any one who has windsurfing experience will know about cavitation(spin out) . And at much lower speeds than referred to here.
So it’s interesting that these foiling yatchts seem to have pushed the boundaries somewhat
Sometimes at lower speeds people will experience foil ventilation, which happens when air gets sucked down the foil and it loses its “grip” on the water. It’s technically not cavitation but often called that - could this be it?
3:15 of flawless delivery. Guy, you might be the best I´ve seen. You got right to it and there were no questions left unanswered. Well maybe, how much is Vestas spending to achieve the record? Answer, if a wind turbine/wind farm multi-national can not win...then who?
Thanks for the kind words! I have no idea how much the Sailrocket project cost, nor what percentage of it was covered by Vestas, but I’ll keep my eyes and ears open!
@@sneescampers Yes that’s why I didn’t include Sailrocket in this video: How Fast Can a Foiling Sailboat Actually Go?!?!?
ruclips.net/video/SWGBgR_Np3E/видео.html I think Sailrocket is cool but also very niche!
Amazing! I track this kind of stuff all the time (I'm an aero eng) and I learned new cool stuff today, thanks!
Great to hear!
That boat is insane.... The driver must have been terrified!
I suspect he might have emptied his drawers after that record run!!!
Beautiful! Limited current application, but technology marches on!
It’s a bit niche but very cool!!!
Great post my friend. Very interesting. 🌞🌴⛵️
Thanks so much!!!
How did they even imagine that design?!? It seems counterintuitive at so many levels.
I think the initial design idea was conceived by Bernard Smith in the 1960s but it took several decades before modern materials and design enabled it to become a reality! Check out the Sailrocket site for more details: www.sailrocket.com/node/259
"maybe not even a boat" made me roll
LOL the World Speed Sailing Record Council (WSSRC) cleverly dodges the issue by calling them “sailing craft”!
Windsurfers and kiteboarders is this principle but use bodyweight to keep from lifting off. Sometimes you are just riding the fin! It's a blast! Thanks for the video and keep up the good work.
Sounds like so much fun!!!
Well explained and straight to the point. Good job, sir.
Thanks - glad you liked it!
Thanks. Sailing is so complicated.
Yes it is, and the constant learning required makes it very interesting IMHO!
Dude, excellent explainer. Thanks. I learned something.
Excellent - the goal of the channel is to help people learn about sailing so glad to hear it’s working!!!
Thanks for the detailed explanation. I was wondering how it was able to sail so fast and still stay hooked on the water. It's not very practical since it's limited to only one direction.
Glad you liked it! No not very practical but still cool!
I suspect practicality was of little concern in the design and development of Larson's Sailrocket - they wanted to get the world sailing speed record, which they did. A brilliant achievement.
@@geoffmcbroom5302 I completely agree!!!
Using inefficiency to overcome efficiency problems. What a great design.
Interesting way of looking at it!
Awesome! I worked with a team who built an airship that uses a vertical dual foil design, it's called the Windcrafter Carangifoil. It's my dream to see airships sail the sky!
That must have been a cool job!!!
@@SailingTipsCa we never found enough funding to build manned versions, but I experienced it working with several radio controlled models, in the wind. There is a patent on it, but it is going into the public domain this next spring. Would love to discuss the benefits of vertical airships if you want, at this point we would just love to see a manned version fly someday!
Excellent explanation on an otherwise arcane extreme sailing craft.
Glad you liked it!
Yes for the picture you indicated... and the funny anecdote is THAT THIS PARAVANE HAS BEEN SHORTENED progressively with an electric saw ON TO seek empirically for the optimum area, a figure which is nearly impossible find by CFD
LOL I know! I think they also tried a couple variations of the wedge-shaped design.
Thanks for the clear illustrations!
Glad they made sense!
Excellent, concise description of the technology! You should teach a master class on technology video production !
Thanks for your kind words! I get lots of practice explaining things to my (non-technical) wife!!!
Look at the shape of the tail fin on a Blackbird SR-22, it has the same wedge shape like the Sailrocket foil !
Interesting observation!
very cool - bring on the super-cavitation era!!
Exactly! Some say they’re not good in light air though ;-)
Excellent and compact explanation! I'd say as much as this boat is just for making a speed record run - it shows and extends the technological barriers, that have been reached when using foils at speed. Maybe in 20 years someone will build upon those insights and be able to build an even faster sailing boat with new ideas. Or a boat that can make use of this technology, but designed to be a more practical multi directional sailing vessel.
Sailrocket definitely pushed the limits but had to make some practical compromises to get there! The more recent focus has been to use foils to achieve higher averages speeds in moderate conditions, rather than top-end speed, as explained in this video: How Fast Can a Foiling Sailboat Actually Go?!?!? ruclips.net/video/SWGBgR_Np3E/видео.html
Yeah good analysis .. well done.
Thanks - glad you liked it!
Didn't realize the foils cavitated. I thought the speed limit was drag like on an iceboat. The Sailrocket is the latest in a line of record breaker that could only sail on one tack. Remember the 2 Crossbows, and Slingshot? Been enjoying your videos since RUclips brought them to my attention a few days ago.
Sailing fast is all about lift versus drag and the drag can come from lots of places - hull, foils, sails themselves! Glad you’re enjoying the videos!
@@SailingTipsCa hmmm im surprised that they cavitate. so is that a limiting factor with plane wings too??
is it an opposite force the foil is applying against the sail or is it resistance ?
@@rhett7716 You might find the videos of the design of the SR71 Blackbird very interesting. If you find the right one it will go some way to answer your question. Inspiring engineering.
It advances engineering and helps push the limits of what was thought possible. That is useful. Whether it leads to practical improvements in sailing speeds is another question. (In this case, probably not due to all the limitations described. Still, it is cool as hell.)
Actually, it is a really important result. It clearly shows the benefits to be gained if one can reduce the amount of cavitation on regular foil boats. This is akin to all the work that has been done on airliner design at transonic speeds to reduce fuel consumption (I used to work at Boeing). Trip strips anyone?
@@KlingbergWingMkII In my mind it is akin to transonic transition although the mechanism is different.
Great video, thanks
Glad you liked it!
Everything you said about Sail Rocket are fair points. But I disagree with you about not mentioning Sail Rocket in a discussion about fast sailboats, for several reasons. First, Paul Larsen's team did this record breaking work more than 10 years ago, and to my knowledge, their outright sailing speed record is not yet being threatened. What they accomplished in basically a small shed, and a shoe-string budget, is a testimony to hard-headed commitment. It's nothing short of astonishing. Second , the fundamental R&D that went into designing, building, and testing sail-rocket is classic Wright-brothers style of engineering. My hat's off to this crew. Finally, Sail Rocket achieved a peak instantaneous speed of 68.33 knots....this in a sail driven craft. At the time, this simply defies belief.
Around the time of the Sail Rocket record runs, I watched a video piece on the kite surfers at Luderitz making speed runs in their specially dug trench in the sand. As one kite boarder packed up his rig in the trunk of his car, he smuggly said "let's see sail rocket do that". A bystander overheard the comment and shot back: "OK, now let's see you put the trench in your trunk as well." Touche.
Point is, early advancements in sailing speed records necessarily occur within the limitations of then existing engineering limits, designs, and materials. Sailing faster yet is the scientific process at work.
I agree that the Sailrocket project produced an amazing result on a tiny budget compared to other campaigns!
My comments about it being a boat or not are related to the fact that it can only sail on one tack and one point of sail i.e. it can’t sail an arbitrary course.
Still an amazing achievement in my mind though!!!
@@SailingTipsCa Yehp, that's fair. But Sailrocket also overcame fundamental limits to the then-known design paradigms and challenges, pointing the way for others to follow. 11 years later, still an astonishing accomplishment.
@@vermontsownboy6957 Yes first sailing vessel with super-ventilating/cavitating foils that I’m aware of!!! I think Syroco is using some of the same concepts but haven’t pulled it all together yet…
My simple question regarding Sailrocket 2 is why have they not tweeked her and gone out again to squeeze another few knots?
Would love to see her out once a year in Walvis. It's been 12 long years since the record was set.
Where is all the competition as well?
I suspect they were probably exhausted both financially, emotionally, and physically at the time, and having smashed the record by such a huge margin the team members probably disbanded to pursue other opportunities that would have been knocking down their doors at the time. There is however another project actively chasing their record: syro.co/en/speed-record/
SailGP Team France hit almost 54 knots. Pretty amazing.
I know! Their foils must have been cavititating like crazy!!!
.
Most speed records require the competitor to complete the course in 2 directions (i.e. there and back), the fact that Sailrocket 2 can only go in one direction, to my mind, completely invalidates the record. It's a very interesting contraption, but not a record setter to my mind. Great explanation on the foils though.
Yes with land-based records they like to have you run in two directions to “erase” the effects of the wind, but with sailing records you’re really trying to harness the wind to the greatest degree. I agree it would be far more practical if it could sail an arbitrary course!
Sailrocket's supercavitating foil reminds me of the North American X-15 rocket plane's supercavitating vertical stabilizer. Although also unable to fly an arbitrary course and was certainly not "particulary practical", the X-15 is still the fastest airplane ever flown nevertheless.
Yes I think there are lots of parallels with experimental high-speed flight!
For those interested check out the Hudson River Ice Yachts..... phenomenal speed at the start of the 20th Century pardon the pun they blew me away. Congrats on a great channel.
Ice boats are simultaneously amazing and terrifying!!! Glad you like the channel!
Thanks for a great explainer!
Glad you liked it!
Amazing video. Great job sir!
Thanks for your kind words - glad you liked it!
@@SailingTipsCa I believe Einstein said true genuis is explaining something incredibly complex in a way that everyone can understand. Nailed it
@@PorkChopXpress4385 Wow best compliment ever!!!
@@SailingTipsCa just had to come back to this one more time. I firmly believe the education system could be transformed with the method of teaching you used. There is a potential to convey so much information in a short period of time if done correctly. It is my opinion that you did it correctly!
@@PorkChopXpress4385 Maybe it would be more fun and engaging for the kids too! Any suggestions for other interesting sailing-related topics?
Amazing stuff. It's definitely a boat though, it's a sea-going vessel, it doesn't fly or ride on land, and a sailboat since it uses the wind to power itself. You wouldn't call a land speed drag car "not a car" because it looks weird, it'll always look weird because speed requires such sacrifices. Also I'd love a go at it, it looks terrifyingly fun!
I think the speed record applies to “sailing craft” which includes boats, wind surfers and kite surfers. I agree that it would be slightly terrifying!
@@SailingTipsCa that makes sense too, actually
But does it really need flat water? We could just make it bigger and the size of the waves would shrink in relation to the size of the foil.
The Sailrocket was designed to fit into a standard 40’ shipping container to make it easier to transport from the manufacturing site to the sailing site. Making it bigger would enable it to handle bigger waves, but still probably not the waves you’d typically encounter in 30 knots of wind in the open ocean. Deliveries would also be much more difficult!
So you run into similiarly weird issues like RC gliders. There the speed record is in the meantime 882 kpb (548 mph).
So you are as fast as a jet and get near the sound barrier. And that means that you run into compressibility, that in some parts of the wing the air is accelerated to supersonic, which gives a shock wave, causes the airflow to delaminate, the lift to implode and drag to explode.
So the ones that "are in the scene" say that to get faster, they would have to switch to transonic airfoils, that are optimized to minimize this shockwave effect of local supersonic airflow.
But they - surprise! - are bad at low airspeeds, where you need lift. They are usually very thin with a sharp leading edge (and so only good for a VERY small angle of attack range).
Wow that’s fast for an RC glider!!!
Yes the similarities are interesting with efficient (high lift/low drag) foils having “speed limits” which require a different engineering solution to go faster, and that solution is very inefficient at lower speeds!
Ideally one would have transforming foil shapes but that’s also very hard in underwater foils because they are very heavily loaded as compared to airplane wings, being much smaller because water is so much denser.
Amazing the Vestas team managed to accomplish this without destroying their boat on a well charted reef or ploughing over a fishing boat killing one of the fishermen. Perseverance at its finest.
Yes, hats off to Paul Larsen and his team!
Super informative
Glad you liked it!
How about a rotating pizza cutter blade for the hydroplane? That way the blade would rotate at the same speed as the water, so cavitation would be eliminated. Then you could go as fast as Sailrocket 2, but with a normal hydroplane setup. Tip: Don't touch the blade...
Interesting idea - I agree that touching the blade would not be recommended!!!
The competition is continuiing with SP80 (Switzerland) and Syroco (France) !
I know - it will be exciting to see how this plays out!!!
this is one of the few times i accept impracticality... when you use various well known effects in a new way, sometimes contradictory to common practice, to do something previously considered impossible...
thankyou for making a 3 minute video rather than 30 to say the same thing.
Thanks - I very much prefer making 3 minute videos over longer videos!!!
Regardless of the limitations of the design, the fact that it can get to 65kt is impressive for a sail boat, it's almost powerboat terretory.
Yes and there are many powerboats that can’t approach Sailrocket’s speeds!
All boats are a compromise. This boat makes a lot of compromise's to achieve the speeds it does. The biggest compromise it makes is practicality... This is about as practical as converting a Trimaran into a wing in ground affect. Thanks for the video.
Yes all boats are indeed a compromise, especially when pushing the limits of performance!!!
@@SailingTipsCa It's definitely pushing the limits of something.. 🙂 My wife and I have sailed the coast of Alaska for 20+ years for months at a time. I am fine with sailing at 5-6 knots and watching the scenery go by. My priority is a safe, seaworthy boat not speed. That is the compromise I make when buying a boat. Last thing I want is to have the damn thing sink out from under us 100 miles from anywhere.. I wouldn't mind owning a faster boat as long as it isn't a compromise in safety and seaworthiness. Thanks for the reply! 🙂
@@mojoneko8303 Definitely understandable given the remoteness of your sailing area - beautiful place!!!
@@SailingTipsCa Turning a Trimaran into a wing in ground effect. Now that would be an impressive engineering feat. Especially if you could accomplish it with sails instead of a motor. Hmm sounds like I found a winter project.. 🙂
@@mojoneko8303 Yes, and you could make a RUclips channel!!!
60 kts?! SIXTY?! That's insane. I don't care if it's actually not a boat it's still an impressive feat of engineering. 😊
Yes 65.24 to be precise, and the momentary top speed was 68 or something. That’s over 120 km/h!!!
@@SailingTipsCa I believe not every helicopter can go that fast :)
@@getsideways7257 Even a slower helicopter is probably more versatile though!
@@SailingTipsCa True. And either is exceedingly dangerous.
I wonder if a conventional hydrofoil could beat the cavitation barrier by changing the shape of the foil while moving
Yes that would be really cool - like an airplane wing! The engineering challenge is that foils are comparatively small and very highly loaded so not much room inside for what would need to be some very strong actuators!
Land speed sailing record is currently about 120 mph (105 Kts). So it would appear the water interface is still the limiting factor here, not the rig.
Yes drag / friction with the water is far greater than wheels on land or blades on ice, so definitely the limiting factor, even with foils!
The land speed record for cars is currently 760mph with at least 3 current project aiming for 1000mph. The water speed record is 317.5mph, and it hasn't been broken since 1978 because people keep dying trying, though there at at least 6 current WSR projects, including the current LSR holders.
I think about 30 seconds in my thought was - how do they get back unless they do a whole lot of tacking.
Yes pretty much need a tow!
Very nice and informative video, I had no idea this negative lift hydrofoil principle was used!
Only comment: it's not air that fills a cavitation bubble but (low pressure) water vapor. If there is air, it must be an active bleed system.
In this particular case it’s a combination of water vapour from cavitation and air sucked down the from the surface, so really more of a “superventilating” foil!
For one of the biggest mysteries is how sails are able to generate forward thrust.
This video might provide some insight! How Does a Boat Sail Faster Than The Wind?!?!? ruclips.net/video/LKLa8_GOuPg/видео.html
@@SailingTipsCa it sure did thank you
@@theoneed2051 Excellent!!!
"... maybe not even a boat" perfect observation
Maybe a "sailing craft"?!?!?
I was there in the 1970's. cold water though.
Cool - were you partaking in any kinds of sailing!
Some kind of master tactian in history could've used this tech for a very specific ambush
That would be interesting!
'maybe not even a boat' made me laugh
LOL that was the goal - glad it worked!!!
2:17 Why not use a variable geometry foil that would be efficient at all speeds?
Yes that would be ideal, like airplane wings, but more space inside them for mechanisms!
Very interesting. I've never even heard of the 'SailRocket', or the concept of 'Super Cavitation'.
Perhaps in a few years, someone will figure out how to apply these concepts in rougher waters and arbitrary courses
Yes it will be interesting to see if somebody can figure out how to build a foil that is efficient in more wind ranges!
Very ingenious!
I agree!!!
Makes me wonder if a blown flap could do a similar job in a AC or Sail GP foiling boat above the 50 knot barrier
Like a jettisoned flap? The main issue would be that the supercavitating foil is very inefficient at lower speeds so you'd have to stay above 50 knots which would be hard, otherwise sub-cavitating foils will get you there faster with higher average speeds.
Could a large version of this carry a load viable enough for industrial transport.. l wonder. (⛵⚓ I do have a great knowledge of ocean yachting. )
Foiling boats are very weight sensitive so you’d be limited to hauling things like feathers and helium balloons!
I do wonder about a wind powered vehicle which is basically a glider tethered to a supercavitating torpedo. The "sailor" might be slung under the tether rather than being inside the torpedo.
This vehicle would be able to sail in either direction, and you could use figure 8 kite sailing techniques in weaker wind conditions or higher waves.
I think that may be kind of what these guys are going for? syro.co/en/speed-record/
@@SailingTipsCa Oh wow, yeah that's the idea! I was thinking of something less sophisticated, without a streamlined crew pod. Just something very minimal like a kite surfing rig. But you don't need to have a surfboard, and there's a second tether attached to your back, going to the torpedo. Or something like that.
Like a land speed record car Sailrocket has been purpose built to do one thing very very well at the cost of being useless at just about everything else. At this point in humanity's technological development this is true for many endeavors as the technology involved matures and we start reaching limits which only the uniquely specialized can reach.
Yes, as with many things specialization is required to reach the limits, but then you compromise general usability. Everything in sailing is a compromise!!!
Speed record vehicles often require special modification and a specific place to let rip
I'll pay it, even if it doesn't qualify as a usable boat for any other purpose
Yup that’s pretty much how it is in all speed record vehicles of almost any type!
What is the fastest sail thing that can go both ways?
Great question - here’s the current listing in speed order: en.wikipedia.org/wiki/Speed_sailing_record. So after Sailrocket 2 come a bunch of kite boards with the next fastest “boat” that can sail an arbitrary course being L’Hydroptere.
Not a sailboat then but a sail dragster! Still cool and going faster than the other guy is what it's all about.
Pretty much! And you can’t drive your top fuel dragster to the supermarket either!
Hello, great video about a unconventional way of using foils! Their is also now, SP80 and Siroco sail teams that are trying to break this speed record with 2 very different approaches if you want to have a look
Yes definitely an exciting time with different groups going for the record!
Answer to thumbnail caption:
...by sailing very fast!
And I believe they did that!!!
Shouldn't it be possible to have both conventional foils and super-cavitating foils on a boat and switch them on higher speeds? I mean todays boats also have the capability to lift their foils. Or does something speak against that?
Yes the ability to swap between low and high speed foils would be just the ticket, just need to find a way to do that which doesn’t add a ton of weight to the boat!
For sure, the weight might be the biggest concern. But maybe we'll see something like that in the future. Would be awesome.
Pretty Impressive !
I agree - an amazing accomplishment!!!
@@SailingTipsCa I fly Radio Control Gliders and getting energy from the wind hasn't all been figured out yet. You want to be amazed, do a Yt search for Dynamic Soaring vid's. These R/C gliders take up to 40g's and do speeds 8 x faster than the prevailing wind. It was discovered by a Lockheed Martin "Skunkworks" engineer by accident when he flew over the ridge top into the swirling wind on the back side of the hill and came out much faster than the wind he was getting lift from on the front side. I went to a Dynamic Soaring event on the coast of Oregon and watched them hit 250mph in a 23 mph wind.
@@uuzd4s Others have mentioned dynamic soaring as well - I’m still trying to wrap my head around it!!!
@@SailingTipsCa Hadn't done so in a while so I just did a YT search on Dynamic soaring. They just hit 548mph with sustained speeds over 500mph on a 7ft wingspan R/C Glider. The prevailing winds were around 35mph coming up the hill. Most the video doesn't follow a Glider that well at those speeds w/ a handheld camera but there's some of it good enough to WoW ya. Anyways, just more expensive toys to play with I guess. Take Care.
@@uuzd4s That’s amazing - I’ll look that up thanks!!!
I did some windsurfing at Walvis bay, it's fantastic!
That must have been a cool experience!
@@SailingTipsCa yeah; flat water, blistering wind, sunny and seals as company.
@@AdventureDriver It would be an amazing experience!
Cool! Good explanations too!
I think it’s a pretty cool boat, and glad you liked the video too!
Cool, way cool... ❤❤❤ 😊
I agree!
I think it comes down to one thing water is a solid for all practical purposes. And combining a solid with a gas (air) is going to limit the the physics you can break to achieve these high speed sail boats.
Even with foils the drag from the water is far higher than the blades on an ice boat, or even the wheels of those sand sailing buggies!
Perhaps a type of hydrofoil that changes it's shape based on the craft's speed could be developed. It could be composed of Solid rollers, mounted on actuators. wrapped in a deformable waterproof material, such as rubber..The actuators could be activated by digital or analogue means, real time. so that once cavitation begins to occur, the foil changes from tear drop to wedge.
Send me a cheque, we're good.
I think I need a bigger cheque book!!!
That is insane. How cool that people actually bother to build their designs anyway
And then ship them to Namibia and risk their necks far away from home!
IIRC, land speed rules say your final result is the average of two runs, one in each direction, with a maximum turnaround time. Is there anything like that for sailing? What's the equivalent rule on the water?
Here are the rules for 500m, which is one of the records held by Sailrocket 2, the other being one nautical mile. I think the bidirectional thing with land-based records is to cancel out the effects of wind, however sailing records are trying to harness the wind. www.sailspeedrecords.com/the-course-of-500-m
Love your videos, but can you include more data on the wind speed and sea state etc at the time these records were set? Thanks, and keep up the good work 🙂
Yes should have included that! Sailrocket 2 broke the 500 and nautical mile records at Walvis Bay in November 2012, with the wind at 25-30 knots. The sailing area is in the lee of a sand bar so sea state is negligible, hence the location. Hope this helps!
75!!! miles per hour? Literally how? That's crazy.
Yes I know - on a sailing boat!!!
I wonder if there are other foil designs that can avoid cavitation
Yes there are as described in this paper: www.marinepropulsors.com/proceedings/2015/MB2-3.pdf
You can also do a Google search for "supercavitating foil" to find more!
Vestas was the danish team, right?
Vestas as the title sponsor is a Danish company that manufactures wind turbines, but the SailRocket team is actually quite international: Paul Larson who piloted SailRocket is Australian, other team members are also from around the globe, much of the design and testing took place in the UK, and the actual record was broken in Namibia! Check out their website for more details: www.sailrocket.com
…sailing unlimited…i like it…always in whatever elite sport i participated…training for decades and competing…always the unlimited classes…closer to the restriction of nature…and human capabilites…i like that…
It can be fun to test the boundaries of things!!!
"Literally." What, as opposed to metaphorically?
Yes!