@Sky Man You sound like someone whose very insecure in their intelligence. You dont have the capability to actually understand the science and the math so you start making absurd claims with no evidence backing it up. You're so desperate to convince yourself that you have it all figured out and that the people who were able to actually dedicate themselves to science are a bunch of fools. How sad and pathetic lmao
No they're not next level. If they talked to aero space engineers they talked to the wrong people, because we are talking HYDRO foils and NOT air foils. Water is incompressible and so using the air foil analogy is TOTALLY incorrect. If they talked about an aircraft in supersonic flight, they would be closer to getting the technical explanation right. Ignore everything she said except for the part about changing the flow direction of water, because that is where the lift occurs. She forgot to mention you can never have just one foil either. They always come in pairs. Leading foil and trailing foil to maintain balance - without 2 foils, instability would occur.
@Sky Man dude, have you ever even scienced? Every word you posted increasingly showed how unaware you are of how it works. You, my friend - and I don't mean this perjoratively - are a textbook case of the Dunning-Kruger effect. And on a side note, doing research shouldn't not be something commendable, it is expectable... If you believe anything without sufficient evidence, you're being irrational *by definition* . I'm not educated on the matter and don't know anything about @Gerhard Kutt 's comment, but this seems like a good demonstration of how easily we can fall for the argument from authority fallacy, and ignore the fact the people who research things "for us" are also fallible.
Nice work. As an engineering analyst I didn't expect you to explain this so well. We can't even agree on how it works! Luckily there has been significant empirical data gathered for our home shaped hydrofoils to be developed from. I'm enjoying putting my work into my pleasure, shaping boards and foils to work that much better. In 1996 I was flying a home built personal hydrofoil on Lake Tapps outside of Seattle while working as an analyst to Boeing. My lovely family put me off for 25 years, but I'm back at it, kite foiling and wing foiling with an amazing crew down here in NZ! Woo-Hoo!
Excellent video. I'm not an engineer, but understood a good amount of this. It's really refreshing to see people make the effort to understand and explain, kudos.
Holy cow! You guys are raising the bar for all other kiting channels!! I didn’t expect to be taken back to my chemical engineering fluid flow class but enjoyed your academic explanation nonetheless!!! Nice work and keep the educational videos coming. The technical aspect of this sport can be intimidating at times but it’s also what makes it so cool! Thanks so much for your work on your channel.
Thanks for the comparison of the different explanations/factors for lift. One thing not mentioned is the general shape of a wing: it is a stretched teardrop (teardrop is the most aerodynamic shape). A straight "stretched teardrop" that has the trailing edge lower in the airstream would get lift because of the angle of attack alone (1) (like sticking your hand out the car window, due to molecular collisions, pressure differential, or whathaveyou). A flat board would also receive such lift, but it wouldn't slide through the wind as well as the straight-stretched teardrop shape. We don't often see such zero angle-of-attack straight "stretched teardrop wings, though. ... Stretching the top side of the teardrop while keeping the bottom straight and while keeping the angle-of-attack at zero degrees (2) would also provide lift (due to the Bernoulli effect), but we don't see this alone often either. Combining 1 and 2 gives more lift than either one alone. ... You can also see from the blades of a household electric fan that the local angle of attack increases as air moves over the blade. The inside of the curve of the blade gradually pushes harder and harder on the air molecules as the airflow gets pushed more and more. I don't know if this is force (3) from my above analysis or just an aspect of (1) and (2) twisting together. ... And when an airplane flies upside down, the angle-of-attack has to be increased enough to overcome the downward "lift" caused by Bernouli effect of the longer bottom side of the wing (and the curved shape, I guess). This is why such flights are slower and require more engine power to execute. They're inefficient and always at near-stall.
Planes that are designed to fly upside down have much more symmetric aerofoils, often with much less camber - they will also have adapted empennage to allow the presevertaion of a (relative) positive angle of attack on upside down flight. A modern commercial simply would not be able to fly upside down (or not very long atleast without greatly exceeding ultimate loading specifications in the tailwing)
And in the end, I am always blown away at the thought that the relatively small main and rear wings can generate enough lift to push not only the board but the weight of my body up and out of the water. Fascinating!
Fascinating, well presented. And to think, I put a kayak up on a submerged foil around 1960, but I could not paddle so fast for long. I still remember tying a line to the kayak and having a person tow me onto the foil for a sustained ride. As soon as the kayak popped up on the foil, he went head over heels as the foil abruptly reduced the load on the tow rope as it lifted the kayak above the water. I went on to fly possibly the first of what is called the Rogallo Wing and it"s motorized form, the trike. I could have stayed with the hydrofoil!
with dc motors and batteries of today i am sure a double v surface piercing foil on a kayak would work with the motors at the bottom of the v but i know i will never get round to it but at least you tried bravo
I've been working with wings since the late 80's. We talk about this constantly, and i've never seen a better, clearer explanation. I kept wait for you to leave something out like AOA, but nope, covered, not only covered but gave the ratio's as well. Will be bookmarking and sharing this as the number one best explanation for how wings work, especially when thicker skulls insist on arguing. Brilliant.
Thank you, I have never quite understood hydrofoils. I can only learn by seeing, so descriptions are just words that mean things to everyone else. You taught someone something today
great video! re: planes flying upside down, fwiw, when flying an RC model plane upside down, you typically have to add a bit of elevator angle to counteract the 'downward' lift being generated by the inverted wing. Probably similar in real life.
Inverted flight also uses Newton's 3rd law, not Bernoulli Effect (or you'd crash). Wing's optimum Angle of Attack is ~4-5°, so when flying inverted you also create a 5° AoA by pushing forward on the yoke, elevator down ( now "up") to point the inverted wing upward. Takes practise because it's counter-intuitive. (Old PPL pilot, C152, and engineer).
By adding down elevator when inverted, you are effectively increasing the angle of attack, which then creates lower pressure and lift on the bottom of the inverted wing. Inverted R/C planes that do not have symmetrical wings do not fly great inverted as you are often flying on the verge of a stall because of the angle of attack.
As a fluid mechanics PhD and Aerospace engineer I went into this video with trepidation that you’d point to an incomplete/flawed explanation like Bernoulli’s equation which is a specific simplification of the energy equation that can be made under very specific circumstances. I was extremely relieved to see that your explanation focused on conservation of momentum an generally agree with almost everything you said, well done! My only concern is the assertion of a lack of understanding or consensus among scientists and engineers-the bottom line is you need at least all 5 Navier Stokes equations-conservation of mass, conservation of x, y & z momentum and conservation of energy-to fully describe real fluid flow around 3D foils. It’s very complicated and usually impossible to solve with pencil & paper but there is a general understanding.
Laurie went HARD on hydrodynamics, and I love it. I knew most of these principles already - and BTW the full explanation for lift is all of the above (to varying degrees in different flight regimes) plus compression lift at trans/supersonic speeds - but it's really cool to hear it from a kiteboarding expert's perspective.
she went HARD but wrong. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
Keep in mind that streamlines do not reach the end of airfoil at the same time. Look for Holger Babisnky's explanation on how airfoils generate lift, for more knowledge. PS: airfoils work virtually the same way as hidrofoils.
I was extremely impressed with the quality, presentation style, editing, and thoroughness of the video. You guys are going to have hundreds of thousands of subs one day, and honestly ya'll could broaden the target audience and you'd 100% succeed.
@@OurKiteLife the announcer voices confidence, poised yet delicate, carefully refined with hard facts, this girl knows what she is talking about, in contrast to other outta touch who simply voice read words.
If you ever try wakeboarding, on the take off, it's best to point the board to the side a bit or you will be fighting the high pressure force from under the board when pointing towards to boat. The shape of a wing can exaggerate this effect to generate lift. Nice video on this topic! In science I think air and water are considered fluids.
I was thinking about designing a mini hydrofoil for a project, but needed info on how exactly they worked so that I would make one that was effective. This video was 100% perfect and did a phenomenal job answering all of my questions, and some I didn't know I had! Bravo, great stuff all around!
This video confirms what I have thought about lift for about 50 years. I never believed the first explanations, and this seems to me to be so obvious. Thanks! I feel vindicated.
Your 50 year thoughts are all wrong. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
Thanks for this great explanation. The Bernoulli explanation I was fed at Engg school caused a lot of confusion as it is a complete abstraction from intuition and every day experience and a very inadequate explanation as you point out in your examples which could also include canvas wings. The top of the wing induces suction which in the extreme case in a liquid medium results in Cavitation . This explanation links lift and Cavitation. Great Job and thank you.
Many thanks for the interesting & informative video. (Mahalo nui !) Looking forward to future efforts. Wishing good fortune to all at Our Kite Life. Peace.
Wasn't Graham Bell the real guy who invented the telephone, but it was the italian inventor Antonio Giuseppe Meucci (1871). Graham Bell patented his telephone version just after Meucci's in 1876.
This is the first solid presentation explaining lift in its various theories and finally a solid visual and clear theoretical explanation of it. You guys are amazing! Thank you!
Science geeks! I love it! :-) By the way, before using the term "geek", I searched the web and attended university lectures. I found three definitions, but most experts agree, a "geek" is "a knowledgeable and obsessive enthusiast". I think the definition fits.
From one geek to another, I totally agree! I'd really love to crowd source the solution to endless flight on a hydrofoil. I need everyone's help here: ruclips.net/video/UhSuIcryDAM/видео.html
She could be a great professor of pseudoscientific myths. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
For any Fluid Dynamics expert The vorticity generated by the boundary layer deflects downward the flow and for the conservation of momentum the wing is pushed upwards NO DEBATE
Nice to see the Bell and Baldwin HD experiments getting a shout out. In fact they did a ton of experiments with kites as well that led them to form the AEA and become some of the first humans to fly. Happy to report, some generations later their great grandkids are still flying kites and riding foils, often at the same time. I think if my great grandfather was alive today (F.W.Baldwin) he would be a kite-foiling nut for sure.
@@OurKiteLife Yep. Quite a legacy he left. A born and raised Torontonian as well. We still see the Bell family when we visit Baddeck, and we laugh about how excited him and Bell would be to see me out on the water with my kite / foil.
Excellent video! I'm about to move to a beach town with a small season for surfing, windsurfing and kite boarding, so I've been looking into wing surfing. This video is very informative and clear. Subscribed!
Nice video. Must point out that the ones well described here are not “different theories of lift” instead they are individual explanations of the various forces acting on a wing all together creating lift.
Cool cameo by Rod Parmenter of Foil Buzz at 1:27! (His '87 classic VHS "Hard Winds a Blowin" drew me to the left coast in search of nuking winds decades ago).
he didn't invented the telephone neither the hydrofoil since Forlanini and Crocco already build 2 different hydrofoiling boat in 1906 and 1907 while Bell arrived in 1912
Well, that was enjoyable. I follow a lot of science explanation videos on RUclips, and not any kite surfers, so it's interesting that RUclips knew to recommend me this video.
Blow below the paper it will still lift :). but the speed below is higher :). It is all about the angle of attack and changing the location of fluid. Water pushed down so the wing pushed up. Great explanation
Great video Yuri and Laurie! I’m sure a ton of research and work went into this one. Great comparisons of the 3 theories (with great visuals) which provide a good understanding of the aero/hydrodynamics associated with foil lift. So, should we anticipate the next step will be about the impact foil shape has on lift, drag and speed? Well put together guys, keep them coming! 👍👍👍😀
great video :D Coming from aero background.. dont be too concerned about how planes fly upside down.... because acrobatic planes have simetrical shape while cargo planes and passanger airliners have more clark-y type profile which generates more lift when flying horizontaly...
I'm careful saying people invented something. As a college student I noticed students did research and some professors took credit. Also people may find old discoveries and bring back to life and cover sources. Bell may of made it popular or just taken credit for it. The phone same situation. And patent offices people can get an idea slightly improve and then take credit for it. Sad but true.
At Mississippi State University I was working on my masters in buisness. They took my marketing and buisness plan and opened the buisness after they kicked me out and put a hold on my account for disciplinary action till 2099 professor name is William Hill and Dean name is Tabor Mullen
Sorry to hear that happened to you. We have received many comments re: Bell and the telephone. It has been noted, and we did say he was credited - not that he invented. Going forward we will just avoid saying anything at all regarding inventions, as per your comment
Alexander Bell was a prolific inventer. There were so many ground breaking inventions in the early 20th century that are still considered novel today. Impressive minds are found in every generation.
Wow! exelent works! Well done. As a aviation engineer a jast may ad that airplanes can fly down turns becouse the wing has special set of angle off attack. And you can believe or not but a lot of acrobatic airplanes has symmetric aerodynamic profile. So very professional video! My congratulations! I spent a lot of time choosing my fist hydrofoil 633 Moses Onda. Hydrofoils exactly like aircrafts all has own shape and purpose))) and the flight filings so exacting isnt it ?)
Thanks for your comment Andrew. We were actually contemplating on trying foiling with the hydrofoil upside down, but decided not to bother as when we dug deeper only certain planes can fly upside down, mostly with symmetrical wings.
When you watch this video you almost feel like you understood and then when you watch the lift foil surfboard and the Pegasus, you think again if you really understood it
Wow! Very impressive presentation. I wonder at what speed you have to progress in water for the lift to start to occur? Can you design an hydrofoil that could help long distance swimmers move at speed they could never do before while decreasing the impact of the waves on them? An hydrofoil attach at the abdomen level of the swimmer which would simply induce a high level float on the water and reduce the drag. This seem more efficient than a pull buoy! 😁😁😁😁😁😁😁😁! I have a good imagination!
Aircraft don't fly upside down efficiently or nearly as fast. The 22.5 angle (median of your mention) is used also in anti-radar/radar absorbing surfaces, as well as sound rooms to cause sound to cancel itself out. Either inward or outward angles do this with sound and rf, or in the application of golf balls; a specfic angle of 22.5d in the convex pit forces air pressure modulations to resist one-another using a 3 phase transition of pressure shared among points. In this case it's a plane against the water itself. The reason 22.5d is naturally vexing to white noise, or water flow just the same, is because of simple geometry regarding all forces in a universal rule; the differences of negative and positive spaces become interlocked among a system of flows to resist penetration by outside flows by working with the flow just enough. 22.5d x 8=360d. It may not seem like a 1 dimensional flow of water pressure could be applied to the 8x geometry, so is it just coincidence? In elementary particle physics, superconductivity was never realized in geometry until I wrote a paper on this in 1996 and Egor Babaev discovered this also on supercomputer 10 years later appx. (ref: type 1.5 superconductivity) My Grampa used to race hydrofoils on Lake Washington. I can tell you, the longer the boat, the safer it can operate at high speed without computers. It is also possible to use a gyroscope, and the mere flow of water can be your computer. There's always a better design for something somewhere just when you think you've got it figured out.
Well produced video I was looking for something that explained hydrofoil but I kinda think the airplane lead was unnecessary. There are major differences with the interactions of rudders, ailerons & wings. I get that they are wing like and provide lift. I would have liked to hear what some challenges that builders had to overcome before finished products. But it still helps me understand more
The total pressure above and under the aerofoil is equal. But on the top of the Aerofoil you have higher dynamic pressure and lower static pressure and on the bottom you have a lower dynamic and higher static therefore although the total pressure is equal on both side you still have a higher static pressure on the bottom which create a lift and pushes the aerofoil up
the (4th) angle of attack explanation is the correct answer as it explains how planes fly upside down,how symmetrical aerofoils work,and also how propellers (air and water screws ) , wind turbines and sails work- And it is also the correct explanation of Newtons 3rd law a wing weather it is in air or water is producing thrust, just like a rocket, by accelerating a mass downwards , All aerofoils do is increase the efficiency of this process by reducing drag , (they also have an important effect on controllability of the craft) The confusion is caused my the imaginary 'lift force' when in reality its just Thrust
No discussion of circulation theory and starting vortices? After all, it is the explanation that ties in with the magnus effect (lift generated by a spinning cylinder or sphere). It is also the theory of lift presented by Whidden and Levitt in the 2016 edition of "The Art and Science of Sails" published by North Sails Group LLC.
Not sure where you got this date from but the Italiens on lake Como and the Swiss on Lago Maggiore where already fouling with boats before Bell in Canada.
"We talked to aerospace engineers and we watched University lectures on fluid mechanics"... you guys are truly next level!
@Sky Man You sound like someone whose very insecure in their intelligence. You dont have the capability to actually understand the science and the math so you start making absurd claims with no evidence backing it up. You're so desperate to convince yourself that you have it all figured out and that the people who were able to actually dedicate themselves to science are a bunch of fools. How sad and pathetic lmao
No they're not next level. If they talked to aero space engineers they talked to the wrong people, because we are talking HYDRO foils and NOT air foils. Water is incompressible and so using the air foil analogy is TOTALLY incorrect. If they talked about an aircraft in supersonic flight, they would be closer to getting the technical explanation right. Ignore everything she said except for the part about changing the flow direction of water, because that is where the lift occurs. She forgot to mention you can never have just one foil either. They always come in pairs. Leading foil and trailing foil to maintain balance - without 2 foils, instability would occur.
@@gerhardkutt1748 Thank you for injecting a little reason into this blur of confusion, including that of the presenters.
@Sky Man dude, have you ever even scienced? Every word you posted increasingly showed how unaware you are of how it works.
You, my friend - and I don't mean this perjoratively - are a textbook case of the Dunning-Kruger effect.
And on a side note, doing research shouldn't not be something commendable, it is expectable... If you believe anything without sufficient evidence, you're being irrational *by definition* .
I'm not educated on the matter and don't know anything about @Gerhard Kutt 's comment, but this seems like a good demonstration of how easily we can fall for the argument from authority fallacy, and ignore the fact the people who research things "for us" are also fallible.
@Sky Man Glad you liked it!
Nice work. As an engineering analyst I didn't expect you to explain this so well. We can't even agree on how it works! Luckily there has been significant empirical data gathered for our home shaped hydrofoils to be developed from. I'm enjoying putting my work into my pleasure, shaping boards and foils to work that much better. In 1996 I was flying a home built personal hydrofoil on Lake Tapps outside of Seattle while working as an analyst to Boeing. My lovely family put me off for 25 years, but I'm back at it, kite foiling and wing foiling with an amazing crew down here in NZ! Woo-Hoo!
Thanks Greg. Glad you are back to foiling and from what we know there is a lot of wind in NZ, kind of jealous.
Whats a decent low budget wing foil setup?
I'm 30 min from lake tapps! Beautiful lake
Excellent video. I'm not an engineer, but understood a good amount of this. It's really refreshing to see people make the effort to understand and explain, kudos.
Holy cow! You guys are raising the bar for all other kiting channels!! I didn’t expect to be taken back to my chemical engineering fluid flow class but enjoyed your academic explanation nonetheless!!! Nice work and keep the educational videos coming. The technical aspect of this sport can be intimidating at times but it’s also what makes it so cool!
Thanks so much for your work on your channel.
I just studied this at a Master Degree course of Aero-Hydrodynamics and I have to say this was very precise and clear. Nicely done.
Thanks for the comparison of the different explanations/factors for lift. One thing not mentioned is the general shape of a wing: it is a stretched teardrop (teardrop is the most aerodynamic shape). A straight "stretched teardrop" that has the trailing edge lower in the airstream would get lift because of the angle of attack alone (1) (like sticking your hand out the car window, due to molecular collisions, pressure differential, or whathaveyou). A flat board would also receive such lift, but it wouldn't slide through the wind as well as the straight-stretched teardrop shape. We don't often see such zero angle-of-attack straight "stretched teardrop wings, though. ... Stretching the top side of the teardrop while keeping the bottom straight and while keeping the angle-of-attack at zero degrees (2) would also provide lift (due to the Bernoulli effect), but we don't see this alone often either. Combining 1 and 2 gives more lift than either one alone. ... You can also see from the blades of a household electric fan that the local angle of attack increases as air moves over the blade. The inside of the curve of the blade gradually pushes harder and harder on the air molecules as the airflow gets pushed more and more. I don't know if this is force (3) from my above analysis or just an aspect of (1) and (2) twisting together. ... And when an airplane flies upside down, the angle-of-attack has to be increased enough to overcome the downward "lift" caused by Bernouli effect of the longer bottom side of the wing (and the curved shape, I guess). This is why such flights are slower and require more engine power to execute. They're inefficient and always at near-stall.
Planes that are designed to fly upside down have much more symmetric aerofoils, often with much less camber - they will also have adapted empennage to allow the presevertaion of a (relative) positive angle of attack on upside down flight. A modern commercial simply would not be able to fly upside down (or not very long atleast without greatly exceeding ultimate loading specifications in the tailwing)
And in the end, I am always blown away at the thought that the relatively small main and rear wings can generate enough lift to push not only the board but the weight of my body up and out of the water. Fascinating!
That's because water is so, so, so, so much denser than air.
Fascinating, well presented. And to think, I put a kayak up on a submerged foil around 1960, but I could not paddle so fast for long. I still remember tying a line to the kayak and having a person tow me onto the foil for a sustained ride. As soon as the kayak popped up on the foil, he went head over heels as the foil abruptly reduced the load on the tow rope as it lifted the kayak above the water. I went on to fly possibly the first of what is called the Rogallo Wing and it"s motorized form, the trike. I could have stayed with the hydrofoil!
with dc motors and batteries of today i am sure a double v surface piercing foil on a kayak would work with the motors at the bottom of the v but i know i will never get round to it but at least you tried bravo
I've been working with wings since the late 80's. We talk about this constantly, and i've never seen a better, clearer explanation. I kept wait for you to leave something out like AOA, but nope, covered, not only covered but gave the ratio's as well. Will be bookmarking and sharing this as the number one best explanation for how wings work, especially when thicker skulls insist on arguing. Brilliant.
Thanks Dean
Very refreshing to not just hear the canned explanation with no thought behind it if it actually makes sense. Great job!
Thank you, I have never quite understood hydrofoils. I can only learn by seeing, so descriptions are just words that mean things to everyone else. You taught someone something today
great video!
re: planes flying upside down, fwiw, when flying an RC model plane upside down, you typically have to add a bit of elevator angle to counteract the 'downward' lift being generated by the inverted wing. Probably similar in real life.
Inverted flight also uses Newton's 3rd law, not Bernoulli Effect (or you'd crash). Wing's optimum Angle of Attack is ~4-5°, so when flying inverted you also create a 5° AoA by pushing forward on the yoke, elevator down ( now "up") to point the inverted wing upward. Takes practise because it's counter-intuitive. (Old PPL pilot, C152, and engineer).
By adding down elevator when inverted, you are effectively increasing the angle of attack, which then creates lower pressure and lift on the bottom of the inverted wing. Inverted R/C planes that do not have symmetrical wings do not fly great inverted as you are often flying on the verge of a stall because of the angle of attack.
This video was clearer than any fluid mechanics textbook in the world
I love how easy it is to just randomly stumble upon a great video.
As a fluid mechanics PhD and Aerospace engineer I went into this video with trepidation that you’d point to an incomplete/flawed explanation like Bernoulli’s equation which is a specific simplification of the energy equation that can be made under very specific circumstances. I was extremely relieved to see that your explanation focused on conservation of momentum an generally agree with almost everything you said, well done! My only concern is the assertion of a lack of understanding or consensus among scientists and engineers-the bottom line is you need at least all 5 Navier Stokes equations-conservation of mass, conservation of x, y & z momentum and conservation of energy-to fully describe real fluid flow around 3D foils. It’s very complicated and usually impossible to solve with pencil & paper but there is a general understanding.
OMG! The first video I've seen that actually get's the physics of wings correctly! Well done!
This video reminds me studying for my professional license of Engineering. Solving problems using the Bernoulli equation to find pressure head.
yeah, same.
I use these equations every day
that was the most complete explanation of dynamic lift I've ever experienced. Excellent work!
Ma’am, I’ve listened to more people, from many different professions and education, than I can remember try and explain lift.
Thank you.
Laurie went HARD on hydrodynamics, and I love it. I knew most of these principles already - and BTW the full explanation for lift is all of the above (to varying degrees in different flight regimes) plus compression lift at trans/supersonic speeds - but it's really cool to hear it from a kiteboarding expert's perspective.
I wouldn't say she went HARD on it, as I didn't see any formula or equations, but still it was a good vulgarisation
she went HARD but wrong. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
Keep in mind that streamlines do not reach the end of airfoil at the same time.
Look for Holger Babisnky's explanation on how airfoils generate lift, for more knowledge.
PS: airfoils work virtually the same way as hidrofoils.
>> Keep in mind that streamlines do not reach the end of airfoil at the same time.
I'll bet that's why she said exactly that.
You guys deserve million subscribers ❤
I never knew what was under those cool floating surfboards. Always thought it was a motor. Great physics lesson.
I was extremely impressed with the quality, presentation style, editing, and thoroughness of the video. You guys are going to have hundreds of thousands of subs one day, and honestly ya'll could broaden the target audience and you'd 100% succeed.
Thank you 🙂
@@OurKiteLife the announcer voices confidence, poised yet delicate, carefully refined with hard facts, this girl knows what she is talking about, in contrast to other outta touch who simply voice read words.
If you ever try wakeboarding, on the take off, it's best to point the board to the side a bit or you will be fighting the high pressure force from under the board when pointing towards to boat. The shape of a wing can exaggerate this effect to generate lift. Nice video on this topic! In science I think air and water are considered fluids.
I was thinking about designing a mini hydrofoil for a project, but needed info on how exactly they worked so that I would make one that was effective. This video was 100% perfect and did a phenomenal job answering all of my questions, and some I didn't know I had! Bravo, great stuff all around!
The best and informative kite channel in the world.
This video confirms what I have thought about lift for about 50 years. I never believed the first explanations, and this seems to me to be so obvious. Thanks! I feel vindicated.
Your 50 year thoughts are all wrong. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
nice presentation made it easy for old guys to understand
Thanks for this great explanation. The Bernoulli explanation I was fed at Engg school caused a lot of confusion as it is a complete abstraction from intuition and every day experience and a very inadequate explanation as you point out in your examples which could also include canvas wings. The top of the wing induces suction which in the extreme case in a liquid medium results in Cavitation . This explanation links lift and Cavitation. Great Job and thank you.
Great video; I appreciate the fact that you took us through the different explanations and research points. Thank you.
Keep going guys! At this rate you'll be the number one kite channel in no time... Thumbs up! Great video.
Thanks so much 🙂
Many thanks for the interesting & informative video. (Mahalo nui !) Looking forward to future efforts. Wishing good fortune to all at Our Kite Life. Peace.
As a mechanical engineer, I just wanted to say…great video!!!!
Wasn't Graham Bell the real guy who invented the telephone, but it was the italian inventor Antonio Giuseppe Meucci (1871). Graham Bell patented his telephone version just after Meucci's in 1876.
I'm an engineer and I learned something by this video - very impressive
Thanks! Happy to hear :)
Much, much, more information then I set out to look for... but I watched it all because it was engaging, informative and well put together. 👏🏻
Best explanation so far .
This is the best explanation on youtubue of hydrofoils, thank you.
This is the first solid presentation explaining lift in its various theories and finally a solid visual and clear theoretical explanation of it. You guys are amazing! Thank you!
Science geeks! I love it! :-) By the way, before using the term "geek", I searched the web and attended university lectures. I found three definitions, but most experts agree, a "geek" is "a knowledgeable and obsessive enthusiast". I think the definition fits.
From one geek to another, I totally agree! I'd really love to crowd source the solution to endless flight on a hydrofoil. I need everyone's help here: ruclips.net/video/UhSuIcryDAM/видео.html
During a dinner conversation about some rather arcane subjects, my 10 year old son said "Dad, you're such a geek - you like to think for fun"
Excellent narrative and explanation. Really well done. Would love to see a 2nd part dealing in more detail with upside down wings and flat wings.
Thank you for the video!!! Was really searching for a good explanation and you did it. Can’t appreciate it enough
Thanks, glad you liked it!
You could be a great professor!! 😅. Remember studying this during Wind design for buildings. Awesome content.
Thanks! 😄
She could be a great professor of pseudoscientific myths. Expose a perfectly flat sheet of plywoid to the wind and see it generate lift despite the lengths of upper and lower faces being precisely equal.
Ilmu fisika yg dipelajari ketika SMA. Orang kreatif yang menerapkan di dalam kehidupan
For any Fluid Dynamics expert The vorticity generated by the boundary layer deflects downward the flow and for the conservation of momentum the wing is pushed upwards NO DEBATE
Your explanation is compensative. I was just looking for an explication on this subject after viewing the America's Cups yacht races. Thank you.
Nice to see the Bell and Baldwin HD experiments getting a shout out. In fact they did a ton of experiments with kites as well that led them to form the AEA and become some of the first humans to fly. Happy to report, some generations later their great grandkids are still flying kites and riding foils, often at the same time. I think if my great grandfather was alive today (F.W.Baldwin) he would be a kite-foiling nut for sure.
no way, your great grandfather was Casey Baldwin?
@@OurKiteLife Yep. Quite a legacy he left. A born and raised Torontonian as well. We still see the Bell family when we visit Baddeck, and we laugh about how excited him and Bell would be to see me out on the water with my kite / foil.
Excellent video! I'm about to move to a beach town with a small season for surfing, windsurfing and kite boarding, so I've been looking into wing surfing. This video is very informative and clear. Subscribed!
Our Kite Life and OK Kiteboarder are the most amazing RUclips kite channels.
Thank you 😊
A really great explanation of how this works!
This is well done! Entertaining and educative. Thank you
Thank you 🙂
Nice video. Must point out that the ones well described here are not “different theories of lift” instead they are individual explanations of the various forces acting on a wing all together creating lift.
I know bro but it's a chick doing it so don't expect much lol
Excellent content. So valuable and well researched. Thank you
Cool cameo by Rod Parmenter of Foil Buzz at 1:27! (His '87 classic VHS "Hard Winds a Blowin" drew me to the left coast in search of nuking winds decades ago).
Bell didn't invent the telephone, he just marketed it,
Antonio Meucci was the inventor
he didn't invented the telephone neither the hydrofoil since Forlanini and Crocco already build 2 different hydrofoiling boat in 1906 and 1907 while Bell arrived in 1912
@@marcofrancioni1155 All great inventions had been made in the "greatest country of the world" - where else?
Baal ....
Meucci FTW
@@mucsalto8377 LOL
Many thanks for this explanation video. Have a nice day.
Great video. Also reminds me why I like maths more. There is no such thing as a better explanation. Things work or they don’t.
Very nice video! It would have been nice to put your sources in the description too :)
Thoughtful, intelligent, complete. Thank you!
Better explanation that the ones you can find in the best physics related channels.. really good work.
The best explanation for wind over wing.
Well, that was enjoyable. I follow a lot of science explanation videos on RUclips, and not any kite surfers, so it's interesting that RUclips knew to recommend me this video.
wonderfully researched. Great explanation!
Thanks Fred 🙂
amazing description, I really like this kind of video. good job to the team who made this. thanks
Blow below the paper it will still lift :). but the speed below is higher :). It is all about the angle of attack and changing the location of fluid. Water pushed down so the wing pushed up. Great explanation
Great explanation. Did not expect that!
Love your videos! Thanks for taking the time to dig into topics with method and persistence. Great fun watching and learning.
Thanks Tomas, glad to hear you enjoy our videos. Cheers!
I feel shortchanged by my physics professors! But I never went too deep into fluid dynamics.
Nice explanation. Well done.
Great video Yuri and Laurie! I’m sure a ton of research and work went into this one. Great comparisons of the 3 theories (with great visuals) which provide a good understanding of the aero/hydrodynamics associated with foil lift. So, should we anticipate the next step will be about the impact foil shape has on lift, drag and speed? Well put together guys, keep them coming! 👍👍👍😀
best ever explaination ❤️
thank you so much for wounderful information 👍🏻💐
I loved the the video and, I need to say, what a beutiful tiny eyes girl! She is mesmerizing! :) Hope this channel grows a lot!
Thank you 🙂
The longer we live, the more we know...if we're open minded.
If you have discernment to sift through the bullshit helps too. Gravity is still just a “theory” and it’s awfully selective.
great video :D
Coming from aero background.. dont be too concerned about how planes fly upside down.... because acrobatic planes have simetrical shape while cargo planes and passanger airliners have more clark-y type profile which generates more lift when flying horizontaly...
Thanks for the insight!
I'm careful saying people invented something. As a college student I noticed students did research and some professors took credit. Also people may find old discoveries and bring back to life and cover sources. Bell may of made it popular or just taken credit for it. The phone same situation. And patent offices people can get an idea slightly improve and then take credit for it. Sad but true.
At Mississippi State University I was working on my masters in buisness. They took my marketing and buisness plan and opened the buisness after they kicked me out and put a hold on my account for disciplinary action till 2099 professor name is William Hill and Dean name is Tabor Mullen
Sorry to hear that happened to you. We have received many comments re: Bell and the telephone. It has been noted, and we did say he was credited - not that he invented. Going forward we will just avoid saying anything at all regarding inventions, as per your comment
Alexander Bell was a prolific inventer. There were so many ground breaking inventions in the early 20th century that are still considered novel today. Impressive minds are found in every generation.
Wow! exelent works! Well done. As a aviation engineer a jast may ad that airplanes can fly down turns becouse the wing has special set of angle off attack. And you can believe or not but a lot of acrobatic airplanes has symmetric aerodynamic profile.
So very professional video! My congratulations! I spent a lot of time choosing my fist hydrofoil 633 Moses Onda.
Hydrofoils exactly like aircrafts all has own shape and purpose))) and the flight filings so exacting isnt it ?)
Thanks for your comment Andrew. We were actually contemplating on trying foiling with the hydrofoil upside down, but decided not to bother as when we dug deeper only certain planes can fly upside down, mostly with symmetrical wings.
When you watch this video you almost feel like you understood and then when you watch the lift foil surfboard and the Pegasus, you think again if you really understood it
Representation great choice of words
Amazing knowledge shared. Thanks 🙏
Wow! Very impressive presentation. I wonder at what speed you have to progress in water for the lift to start to occur? Can you design an hydrofoil that could help long distance swimmers move at speed they could never do before while decreasing the impact of the waves on them? An hydrofoil attach at the abdomen level of the swimmer which would simply induce a high level float on the water and reduce the drag. This seem more efficient than a pull buoy! 😁😁😁😁😁😁😁😁! I have a good imagination!
Aircraft don't fly upside down efficiently or nearly as fast. The 22.5 angle (median of your mention) is used also in anti-radar/radar absorbing surfaces, as well as sound rooms to cause sound to cancel itself out. Either inward or outward angles do this with sound and rf, or in the application of golf balls; a specfic angle of 22.5d in the convex pit forces air pressure modulations to resist one-another using a 3 phase transition of pressure shared among points. In this case it's a plane against the water itself. The reason 22.5d is naturally vexing to white noise, or water flow just the same, is because of simple geometry regarding all forces in a universal rule; the differences of negative and positive spaces become interlocked among a system of flows to resist penetration by outside flows by working with the flow just enough. 22.5d x 8=360d. It may not seem like a 1 dimensional flow of water pressure could be applied to the 8x geometry, so is it just coincidence? In elementary particle physics, superconductivity was never realized in geometry until I wrote a paper on this in 1996 and Egor Babaev discovered this also on supercomputer 10 years later appx. (ref: type 1.5 superconductivity)
My Grampa used to race hydrofoils on Lake Washington. I can tell you, the longer the boat, the safer it can operate at high speed without computers. It is also possible to use a gyroscope, and the mere flow of water can be your computer. There's always a better design for something somewhere just when you think you've got it figured out.
Appreciating your hard work!
Great video should be a science channel
Interesting, I wasn't aware their were multiple theories on lift. thanks
I was thoroughly excited watching this.
Well produced video I was looking for something that explained hydrofoil but I kinda think the airplane lead was unnecessary. There are major differences with the interactions of rudders, ailerons & wings. I get that they are wing like and provide lift. I would have liked to hear what some challenges that builders had to overcome before finished products. But it still helps me understand more
1:28 What is propelling him?
very nice video, foils are magic!
Bernoulli, Venturi and Reynolds are my favorite scientists because they explain exactly how fluid mechanics works in everyday life.
Try thrust vector. It is really very simple to understand. A mass (in this case a fluid) deflected downwards will produce a resultant upward force.
EXCELLENT EXPLANATION.
The total pressure above and under the aerofoil is equal. But on the top of the Aerofoil you have higher dynamic pressure and lower static pressure and on the bottom you have a lower dynamic and higher static therefore although the total pressure is equal on both side you still have a higher static pressure on the bottom which create a lift and pushes the aerofoil up
Thanks from my heart. Very knowledgeable information 🙏
Im Building a hydrofoil rn and this vedeo helped me a lot, thanks :
Ofc I subscribed👍
the (4th) angle of attack explanation is the correct answer as it explains how planes fly upside down,how symmetrical aerofoils work,and also how propellers (air and water screws ) , wind turbines and sails work- And it is also the correct explanation of Newtons 3rd law a wing weather it is in air or water is producing thrust, just like a rocket, by accelerating a mass downwards , All aerofoils do is increase the efficiency of this process by reducing drag , (they also have an important effect on controllability of the craft) The confusion is caused my the imaginary 'lift force' when in reality its just Thrust
No discussion of circulation theory and starting vortices? After all, it is the explanation that ties in with the magnus effect (lift generated by a spinning cylinder or sphere). It is also the theory of lift presented by Whidden and Levitt in the 2016 edition of "The Art and Science of Sails" published by North Sails Group LLC.
Love watching your videos!!
Not sure where you got this date from but the Italiens on lake Como and the Swiss on Lago Maggiore where already fouling with boats before Bell in Canada.