Thank you so much sir, You cleared all my doubts. Love from India. Edit: Watching this vid for 2nd time, I guess "Thank you" is just an understatement sir!
Stronger vortices die out faster too tho, ig it's not counterintuitive but ppl just assume faster must be stronger, not factoring in that it makes the vortex thinner also.
The Wham-O air blaster toy, why does it produce a "kick" when it lauches a vortex-ring? And why can a vortex-ring knock over a cardboard target? It's almost as if a vortex is like an invisible baseball, a massive object, and carrying momentum like any object. (If we completely fill a ring-vortex with smoke, by for example launching it from inside a smoke-cloud, launched towards the clear air, then we find that the ring-vortex looks like a sphere. The edge of the entrained air is roughly spherical.) If that makes sense, well, wings are doing the same thing, but also they're moving sideways. They fling a ring-vortex downwards, but that ring-vortex is being stretched out for miles. The "circulation" on the wing is connected to the tip-vortex pair, is connected to the distant start-vortex. The entire thing carries mass as it moves, and the entire thing was flung downwards by the wing. So, vorticies are objects. If we launch one fast, we obtain an unmistakable reaction-force, as with a rocket-engine, or the kick of firearms.
Yep! That is why sail planes have very long wings. But, long wings, at high speeds, can get into wing-flutter and FAIL in flight! Try and land without any wings!!! The U-2 Reconnaissance Planes (They are not Spy Planes). Have to sue spoilers to descend as if they are too fast in thick air (lower altitudes) the stress may make the wings fail.
Excellent, you avoided the common textbook-misconceptions! Upvoted!. The main misconception is apparently due to Prandtl, who described these vortices as perfectly horizontal (see the Prandtl Horseshoe in his early 1920s papers.) Yet if the Prandtl Horseshoe actually becomes horizontal, the vorticity decreases to exactly zero. (No tilt? No vortices!) Prandtl taught all of us that wings are able to fly by pure pressure-difference alone, without needing to move any air downwards. Wrong. This odd viewpoint only arises in wings of infinite span, where the wing is permanently trapped in WIG (or ground-effect,) and the ground is pushing upwards against the wing, with no net downwash-plume behind the wing. But common flight at altitude has zero ground-effect, and the entire lifting-force results from the downwards motion of mass-bearing vortices, according to F=mA. The vortices entrain the air between them, carrying it downwards, so the net downwards momentum can be enormous. (The so-called "Newtonian" description centers on the creation and the downwards momentum of tip-vortices. Wings are examples of reaction-motors, examples of fluid propulsion, same as propellers, helo rotors, sailboats and jet engines.) Note: refer to helicopters in horizontal flight. Perhaps animate them, first hovering, then also, fast horizontal flight. Watch the vortex-pair form, even though the helo lacks a pair of wingtips. Regardless of the number of blades, the rotor still creates a tip-vortex pair. Also, visualize a helicopter during high-altitude hovering. Conventional aircraft obey the same physics, but this may not be obvious, because their rapid horizontal translation is smearing out the "helicopter-style downwash-plume," to become a long, tilted vortex-structure, rather than a vertical cylindrical column. And, when a cylindrical jet is produced by a transversely-moving orifice, its outer shell of vorticity will "wrap up," to become the familiar scroll-shaped vortex-pair. The vortex-pair entrains a large cylinder of down-moving air, trapped within the mathematical "separatrix" which surrounds the vortex-pair. Similarly, a traveling smoke-ring will actually have the shape of a sphere or a lozenge, as can be seen when an invisible vortex-ring enters a region which contains fog or marker-smoke. A vortex-ring is like a flung baseball made of gas. Conclusion: airfoils fly by the reaction-force from launching smoke-rings downwards, but this fact is very difficult to notice if the wing is moving sideways too fast. Better to inspect a hovering helo, where the downwash-plume can be approached as a tall column of vortex-rings, stacked like pancakes. Also, inspect the fluid plume of a pulsing jellyfish, and inspect the violent reaction-kick produced by the famous Wham-O Air Blaster(tm) toy, whenever it launches a transparent ring-vortex. That's the same "Newtonian" description of the lifting-force of airfoils. Odd trivia: the vorticity does not come from the tips of wings. It comes from the wings' trailing edges, the "Sheet-Vortex." But because vorticies move with the wind, the adjacent vortex-threads will move each other, causing the wide thin sheet of vorticity to wind itself up into a dual scroll-shape. If a wing emits marker-smoke (or emits condensation-mist) from its entire trailing edge, this process becomes easy to observe.
I think that's because of the high temperature of the air thats blown out the back of an engine reacting with the freezing cold air temp at high altitudes, so basically it's just steam
Close but not really... A plane flying at very low speed gets most of its lift from the nose being so high and the wind hitting and compressing against the bottom of the wing, which means that at the wingtip, that air pressure and the plane's motion pushes that compressed air around to the back (top) side of the wing. This constant motion of air causes a very strong spinning current which lasts behind the plane for a significant length of time. At very high speed, this angle is not necessary, and is greatly reduced, because the curvature of the wing provides most of the lift and thus not so much from the now much lower wing angle against the oncoming wind. The pressure difference between top and bottom remains but this spinning current is not so greatly exacerbated by that now much lower angle of attack. The vortex is not related to the amount of time, so much as the difference in angle of attack. It's called INDUCED Drag - Drag induced by creating lift. Induced drag reduces tremendously, exponentially, from lowest to highest speed.
Good explanation Sir. You've made it clear for all of us. It was just spot on. Thank you very much for that. Keep up the good work.
4 ปีที่แล้ว +3
Very good explanation, great job! Another thing we know about wingtip vortices is that they move down AND away from the aircraft. This is particularly important near the ground in light crosswind condition, one of the vortices could remain in the runway until dissipation.
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At slower airspeeds, the changes is caused by change in angle of attack. Slower airspeed requires higher AOA to produce the same amount of lift - therefore strongest vortices.
Для не знающих английского соотечественников речь идет о спутной струе (Wingtip Vortices), которая образуется сходящими с концов крыльев вихрями, образующимися из-за разности давлений в нижней и верхней частях крыла. Спутная струя может стать причиной летного происшествия. Чем быстрее летит самолет, тем менее заметна его спутная струя. Также спутная струя растет с увеличением веса самолета, тк , при этом, выше разность давлений на крыле.
Your explanation was just professional, on point and very clear. Thank you.
Thank you so much sir, You cleared all my doubts. Love from India.
Edit: Watching this vid for 2nd time, I guess "Thank you" is just an understatement sir!
Great explanation, love the graphics too 🫡🫡🫡
Outstanding presentation! I'm requiring this video of all my students.
Stronger vortices die out faster too tho, ig it's not counterintuitive but ppl just assume faster must be stronger, not factoring in that it makes the vortex thinner also.
Very good video.
Great video lesson. Thank you.
A pilot for 8 years I still have difficulty explaining wing tip vortices to students (and even myself). Thank you for the video.
🤦🏽♂️ ok I’m confused. Dammit. Guess I’ll fail my check ride
is this same to helicopter's downwash? thank you very much
Yeah similar
You dont explane why they r formed and y they rotate
How do Wingtip vortices produce lift?
The Wham-O air blaster toy, why does it produce a "kick" when it lauches a vortex-ring? And why can a vortex-ring knock over a cardboard target? It's almost as if a vortex is like an invisible baseball, a massive object, and carrying momentum like any object. (If we completely fill a ring-vortex with smoke, by for example launching it from inside a smoke-cloud, launched towards the clear air, then we find that the ring-vortex looks like a sphere. The edge of the entrained air is roughly spherical.)
If that makes sense, well, wings are doing the same thing, but also they're moving sideways. They fling a ring-vortex downwards, but that ring-vortex is being stretched out for miles. The "circulation" on the wing is connected to the tip-vortex pair, is connected to the distant start-vortex. The entire thing carries mass as it moves, and the entire thing was flung downwards by the wing.
So, vorticies are objects. If we launch one fast, we obtain an unmistakable reaction-force, as with a rocket-engine, or the kick of firearms.
Hello, does it mean that : the stronger the wingtip vortices so the stronger lift-induced drag will be?
Yep! That is why sail planes have very long wings. But, long wings, at high speeds, can get into wing-flutter and FAIL in flight! Try and land without any wings!!!
The U-2 Reconnaissance Planes (They are not Spy Planes). Have to sue spoilers to descend as if they are too fast in thick air (lower altitudes) the stress may make the wings fail.
Excellent, you avoided the common textbook-misconceptions! Upvoted!.
The main misconception is apparently due to Prandtl, who described these vortices as perfectly horizontal (see the Prandtl Horseshoe in his early 1920s papers.) Yet if the Prandtl Horseshoe actually becomes horizontal, the vorticity decreases to exactly zero. (No tilt? No vortices!) Prandtl taught all of us that wings are able to fly by pure pressure-difference alone, without needing to move any air downwards. Wrong. This odd viewpoint only arises in wings of infinite span, where the wing is permanently trapped in WIG (or ground-effect,) and the ground is pushing upwards against the wing, with no net downwash-plume behind the wing. But common flight at altitude has zero ground-effect, and the entire lifting-force results from the downwards motion of mass-bearing vortices, according to F=mA. The vortices entrain the air between them, carrying it downwards, so the net downwards momentum can be enormous. (The so-called "Newtonian" description centers on the creation and the downwards momentum of tip-vortices. Wings are examples of reaction-motors, examples of fluid propulsion, same as propellers, helo rotors, sailboats and jet engines.)
Note: refer to helicopters in horizontal flight. Perhaps animate them, first hovering, then also, fast horizontal flight. Watch the vortex-pair form, even though the helo lacks a pair of wingtips. Regardless of the number of blades, the rotor still creates a tip-vortex pair.
Also, visualize a helicopter during high-altitude hovering. Conventional aircraft obey the same physics, but this may not be obvious, because their rapid horizontal translation is smearing out the "helicopter-style downwash-plume," to become a long, tilted vortex-structure, rather than a vertical cylindrical column.
And, when a cylindrical jet is produced by a transversely-moving orifice, its outer shell of vorticity will "wrap up," to become the familiar scroll-shaped vortex-pair. The vortex-pair entrains a large cylinder of down-moving air, trapped within the mathematical "separatrix" which surrounds the vortex-pair.
Similarly, a traveling smoke-ring will actually have the shape of a sphere or a lozenge, as can be seen when an invisible vortex-ring enters a region which contains fog or marker-smoke. A vortex-ring is like a flung baseball made of gas.
Conclusion: airfoils fly by the reaction-force from launching smoke-rings downwards, but this fact is very difficult to notice if the wing is moving sideways too fast. Better to inspect a hovering helo, where the downwash-plume can be approached as a tall column of vortex-rings, stacked like pancakes. Also, inspect the fluid plume of a pulsing jellyfish, and inspect the violent reaction-kick produced by the famous Wham-O Air Blaster(tm) toy, whenever it launches a transparent ring-vortex. That's the same "Newtonian" description of the lifting-force of airfoils.
Odd trivia: the vorticity does not come from the tips of wings. It comes from the wings' trailing edges, the "Sheet-Vortex." But because vorticies move with the wind, the adjacent vortex-threads will move each other, causing the wide thin sheet of vorticity to wind itself up into a dual scroll-shape. If a wing emits marker-smoke (or emits condensation-mist) from its entire trailing edge, this process becomes easy to observe.
Clear, Concise Video on the Subject. Thank You
Very interesting phenomenon. Are these vortices what cause trailing 'clouds' behind airplanes?
I think that's because of the high temperature of the air thats blown out the back of an engine reacting with the freezing cold air temp at high altitudes, so basically it's just steam
Hi I'm using a screenshot from your video to illustrate wing-tip vortices. Is that okay? Kindly please respond. This was very informational
Close but not really... A plane flying at very low speed gets most of its lift from the nose being so high and the wind hitting and compressing against the bottom of the wing, which means that at the wingtip, that air pressure and the plane's motion pushes that compressed air around to the back (top) side of the wing. This constant motion of air causes a very strong spinning current which lasts behind the plane for a significant length of time. At very high speed, this angle is not necessary, and is greatly reduced, because the curvature of the wing provides most of the lift and thus not so much from the now much lower wing angle against the oncoming wind. The pressure difference between top and bottom remains but this spinning current is not so greatly exacerbated by that now much lower angle of attack. The vortex is not related to the amount of time, so much as the difference in angle of attack. It's called INDUCED Drag - Drag induced by creating lift. Induced drag reduces tremendously, exponentially, from lowest to highest speed.
Thanks for making this video. It is really helpful for me!!
Good explanation Sir. You've made it clear for all of us. It was just spot on. Thank you very much for that. Keep up the good work.
Very good explanation, great job!
Another thing we know about wingtip vortices is that they move down AND away from the aircraft. This is particularly important near the ground in light crosswind condition, one of the vortices could remain in the runway until dissipation.
Very nice explanation.
Highly informing. Better than my textbook
Very well explained! Thank you soooo much.
2:35 I think the reason for here is the increased AOA, not the velocity of the airflow
Am I the only one who is mildly triggered by him saying "dreg" (like "egg") instead of "drag"? Lol probably just me
lol... Canadian eh
Very clearly explained.
Love from India
much thanks for the video, your explanation is very clear. Good job!
Great explanation. Thank you
Very good and clear explanation of wingtip vortices.
Hi, thanks for your great animated videos on behalf of the russian cadet pilot community, I would like to contact you to discuss one issue
well made, clear and good video thank you
Excellent video. Thank you.
Thank you! Good explanation.It helps me to prepare my CFI checkride.
Thank you, that was awesome.
thanks for clean explanation.
great video
Thank you. Very well presented and clear.
"If you reached the end of the video, please like and maybe subscribe. Otherwise, thank you for watching and have a nice day."
You are amazing... Such a genuine human being. ❤🎉
basic.
Basic
tq
\
Very good video bro
Thank you.
thank you so much for this
At slower airspeeds, the changes is caused by change in angle of attack. Slower airspeed requires higher AOA to produce the same amount of lift - therefore strongest vortices.
What an excellent video tutorial. Crystal clear! Thank you for your hard work.
😊
Very very accurate explanation. Also, easy to understand.
Is this for jets too? How do they then fly in formation? Do jets go so fast that any drag from the lead jet doesn't affect the rear?
Для не знающих английского соотечественников речь идет о спутной струе (Wingtip Vortices), которая образуется сходящими с концов крыльев вихрями, образующимися из-за разности давлений в нижней и верхней частях крыла.
Спутная струя может стать причиной летного происшествия. Чем быстрее летит самолет, тем менее заметна его спутная струя. Также спутная струя растет с увеличением веса самолета, тк , при этом, выше разность давлений на крыле.
Fantastic as always! Thank you.
Change to all notifications hop to see more of this kind.
Good video, well done.
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