I discovered that Parasite drag is produced by VERTICAL surfaces and Induced drag is created by HORIZONTAL surfaces, for example when the Flaps are at 0 degrees they produce Max Induced drag and Min Parasite drag, at 90 degrees Min Induced and Max Parasite drag and at 45 degrees in the middle of both. Please let me know if you think it is a valid observation. Thanks
Super underrated explanation with top level animations to help understand the basics of a difficult subject! I absolutely hate every other textbooks/videos that go with the mantra of "thus making the wing feel like it's flying slower". Godawful explanation, thank you for doing an excellent job here!
I always had an issue with this span-wise vs chord-wise explanation. The airflow only cares about the cross section of the wing that it is flowing parallel to, so why isn't it explained that by sweeping the wings, the thickness of the airfoil in relation to the chord length is smaller, therefore lowering the coefficient of pressure, and delaying the generation of shockwave?
Actually, there’s a bigger reason why fast planes have swept wings. Because there’s spanwise flow at all, this means that some of the air flows alongside instead of all of the air being forced over and under the wing in a chordwise flow. This pushed air out of the way more efficiently similar to sliding down a ramp instead of running into a wall. Angling the wings backwards also pulls the center of drag backwards behind the center of gravity so there’s more force that keeps the plane flying nose first.
Why does the free stream "know" the swept wing angles though? If we cut a small strip with very small span from both wings, then they would be almost identical except for the leading edge where the swept wing is slightly slanted. Suppose the cord length is the same for both strips, then I would assume both strip would obtain equal lift ? (assuming simplified aerodynamics without considering tip vortex).
The swept wing is also tapered, so the pressure gradient is a decreasing curve from wing root to tip, and the slant contributes to the air having to flow with a sideway component due to the uneven pressure gradient (spanwise flow), which is how the air "knows" I’m assuming
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I discovered that Parasite drag is produced by VERTICAL surfaces and Induced drag is created by HORIZONTAL surfaces, for example when the Flaps are at 0 degrees they produce Max Induced drag and Min Parasite drag, at 90 degrees Min Induced and Max Parasite drag and at 45 degrees in the middle of both.
Please let me know if you think it is a valid observation. Thanks
Super underrated explanation with top level animations to help understand the basics of a difficult subject! I absolutely hate every other textbooks/videos that go with the mantra of "thus making the wing feel like it's flying slower". Godawful explanation, thank you for doing an excellent job here!
False, swept wings look cooler, only reason they exist 😤
I can't believe I subconsciously listen to the voice with higher focus and attention than to my uni's professors
I always had an issue with this span-wise vs chord-wise explanation. The airflow only cares about the cross section of the wing that it is flowing parallel to, so why isn't it explained that by sweeping the wings, the thickness of the airfoil in relation to the chord length is smaller, therefore lowering the coefficient of pressure, and delaying the generation of shockwave?
because in reality air will always exist and move in 3D
agreed,
sick and tired of those blind application of some vector math and be done with it vidoes.
Very interesting, thank you for the content!
Thank you for explaining *both* concepts. The first one I encountered many times but the second one only in written form.
Best channel ever for my selection
Best explanation.
Better will be straight wing with longer and thinner cord but this is hard/impossible to build. and less space for fuel.
in airliners, 90% of fuel capacity is in fuselage
Love your short videos! Can you do one on how magnetos work!
Thank you! Done: th-cam.com/video/P5JWuYvf1Jk/w-d-xo.html
Can you explain how it works when starting the engine so that the spark is strong enough when cranking the engine!
@flyguy1637 impulse couplers! A few good videos on them
Well done 👏🏼
Thank you 😁
Actually, there’s a bigger reason why fast planes have swept wings. Because there’s spanwise flow at all, this means that some of the air flows alongside instead of all of the air being forced over and under the wing in a chordwise flow. This pushed air out of the way more efficiently similar to sliding down a ramp instead of running into a wall. Angling the wings backwards also pulls the center of drag backwards behind the center of gravity so there’s more force that keeps the plane flying nose first.
Wow, so compact
Why does the free stream "know" the swept wing angles though? If we cut a small strip with very small span from both wings, then they would be almost identical except for the leading edge where the swept wing is slightly slanted. Suppose the cord length is the same for both strips, then I would assume both strip would obtain equal lift ? (assuming simplified aerodynamics without considering tip vortex).
The swept wing is also tapered, so the pressure gradient is a decreasing curve from wing root to tip, and the slant contributes to the air having to flow with a sideway component due to the uneven pressure gradient (spanwise flow), which is how the air "knows" I’m assuming
Excellent explanation. Appreciate.
You are welcome!
Amazing video
Why would the airflow just magically make a turn when it touches the wing? I don’t understand why the air would go perpendicular to the wing
Why the reason sweep back wing makes vertical(Y axial) and directional(Z) stability ?
A related reason is that the apparent velocity seen by the wing is less so the drag is also less.
So it's just about decreasing the effective thickness-to-cord ratio the airflow "experiences"?
plus thickness of everything else-total aircraft volume distribution(cross section area per length)
Can i ask how do you do these animations?
First rule of flight clib never about flight club
Does anyone know in which software is this video made?
Yes. Adobe After Effects.
Ah, so thats why variabel swept wing airplanes exist