Forces I: Lift

[@moonlightguardian5150]

YOU explained so well, being a beginner/neanderthal at aviation I did not have to pause a single second, easily the best explanation

[@boockar]

that's gotta be the most intuitive video on the subject out there. Very clear and simple, yet very complete. I was looking for this kind of content for a while. Thank you very much

[@ashleyrodriguez1906]

Hello , I really like how you break down and explain your information. I’ve always wanted to be a pilot but put it off due to fear ( during turbulence only). I figured if I could understand the physics behind flying, I would gain significant confidence. Please make more videos! You made a difference with me :)

[@coltonl832]

Dude, you should be a professor at Embry Riddle Aeronautical University because you did an amazing job teaching this. I'm going for my CFI check ride on Friday and I'm going to explain it just how you are. Amazing job, I will remember this for life, and have my students watch this video

[@kenmcconnell4148]

Really good stuff now I understand exactly what is going on with the GU Canard of the Rutan EZE especially when wet & more, keep up the good work Thanks

[@somedude7633]

Skipping stone isn’t exactly wrong, it just doesn’t describe what happens above the wing. A lot of the complexities in physics equations are used as precision requirements increase when greater forces are applied in the system. For example: astrodynamics are hardly used on the surface of the earth to describe an action such as throwing a basketball into a hoop. On the other hand, if you intend to throw a basketball on the moon into a hoop on the other side of the moon, it becomes necessary to employ more complex equations. Kids usually use this explanation, and frankly, how often do kids take on aerospace engineering projects?

[@eluceanlestelle]

The best explanation I ever heard concerning how an airplane flies. I am Italian and my English is poor but , with heling of subtitles I could manage to understand your amazing lesson clearly. Thank you Sir !

[@toniodmonio]

Awesome explanation... thanks for the vid!

[@ChauKEith]

Who are you !?!?!? You made a very good explanation !!! Was it hurt? When you fell from the heaven

[@GrumpSkull]

Very well explained. I already understood much of it but the boundary layer which changes the effective airflow shape made sense after being puzzled with wind tunnel vids and the turbulence.

[@SupremeDP]

Holy smokes that's exactly what I needed. Thanks.

[@marcgombau2892]

I have a question, I don't understand why the air particles that go trough the upper part of the airfoil create lift by the force they do upon the wind. I mean if the reaction force up (that is lift) is the same as the force that the air particles make while going through the top of the airfoil (because it is the reaction force) wouldn't they just cancel out and there would be no lift left??

[@ronaldmtenga8093]

I think maybe it's better to explain this in terms of momentum, meaning changing the momentum of the airflow to go downwards would cause the wings to react to that change in momentum to then direct their velocity upwards thus conserving total momentum.

[@kostyachernysh5030]

Yes, the force at the top and at the bottom are equal due to Newtons 3rd law. But when we increase the angle of attack the speed of air increases at the top of the airfoil so as per Bernoulli's principle: the higher speed - the lower pressure. The pressure above the airfoil is lower than the pressure below. That's what produces the lift.

[@chopper2429]

Can you also describe various airfoil shapes? The different options for what the contour of the upper surface can be and what they produce...?

[@DariusOutdoors]

Bernoulli really f's my brain! Squeezing a pipe reduces pressure? Whaaaat

[@huiruzhang5616]

At 17:22 which mentioned as we speed up, the air travels on the upper surface will increase therefore to create a greater pressure difference; however, as we speed up, the entire aircraft is speeding up, which means the air travels both on top and on the bottom of the airfoil will speed up, in that case the air travels on the lower surface will also speed up, how can it create greater pressure difference?

[@huiruzhang5616]

I’m really trying to study the Lift and I have a hard time to come up my own words explaining why the air flows faster over the wing and this video helped me a lot, I just have that one question if anyone can help. The only assumption I can make is that the increase in airspeed on the upper and lower surface are not proportional, but then I’m wondering if any theory or statement can back it up that idea….

[@Observ45er]

@@huiruzhang5616 You are somewhat correct. When viewed from the stationary wing point of view, the air under the wing is slowed down and the air above the wing speeds up. .. Because the increased pressure has been established under the flying wing, the "new" air approaching that higher pressure region is slowed down - decelerated. .. Conversely, because the lowered pressure above the wing has been established, the higher pressure ahead of the wing pushes more and the air is accelerated into the lower pressure - toward the trailing edge. . What may blow your mind is that if you view this from the ground, the air starts out being pushed forward ahead of the wing, then about where the upper air passes the highest point, it has REVERSED DIRECTION and it is traveling OPPOSITE to the direction of flight. That upper air has been Accelerated much more than the lower air. It also finishes close to where it started. . Pressure Gradients Accelerate fluid. This is Newton in fluids. . The air that goes below the wing is constantly pushed forward from before the wing arrives and winds up far form where it started. Its forward speed is FASTER than the upper air's reverse speed! . Bernoulli is about ACCELERATION not speed! .. This is shown in Fig, 7 here: rxesywwbdscllwpn.quora.com/

[@shamelessp]

I wish he would do video on weather theory and more other videos T_T

[@solidkreate5007]

How and where do we learn those mathematical equations?

[@rodericksibelius8472]

Where is the contribution of the Center of Gravity and Aerodynamic Center??

[@lewiscampbell8013]

At 9:36 you say the lift is not produced because the air ricochets off the wing, but isn’t that how an elevator or rudder works?

[@pilotboy2612]

Not exactly. The total aerofoil shape (camber) changes. Say elevator down then the horizontal stabilizer angle of attack increases. Imagine a line joining the leading edge to the trailing edge (chord). Now we have more lift on the horizontal stab - raising the tail - which in turn makes the plane descend. Same applies to ailerons etc. Hope that helps.

[@lewiscampbell8013]

Ok thanks

[@extremelymove1401]

Wow

[@jessetimber1388]

i think the low pressure on top of air foil is not the reason creates lift

[@extremelymove1401]

Jesus loves you sir....

[@MrFb911]

so many wrong statements in this explanation! It is extremely misleading