473 reputation
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bio website dariocortese.weebly.com
location Bristol, United Kingdom
age 25
visits member for 2 years, 4 months
seen 2 days ago

Knowledge and understanding are quite different. Only understanding can lead to being, whereas knowledge is nothing but a passing presence in it. (G.Gurdjieff)


Jul
3
comment Does irrotational imply inviscid?
Yes, clearly. My doubt was about the possibility to have an irrotational flow at low Reynolds numbers. This is possible only if the inertia is neglettable, and this can be only by means of lenght and density, because the viscosity doesn't enter in the eq- of motion for an irrotational flow. Is that true?
Jul
3
awarded  Autobiographer
Jul
3
awarded  Student
Jul
3
awarded  Supporter
Jul
3
suggested suggested edit on How to measure resistance of DI water
Jul
3
asked Does irrotational imply inviscid?
Jul
2
revised How to calculate time dilation in approaching speed of light
I just edited the formulae with Latex
Jul
2
suggested suggested edit on How to calculate time dilation in approaching speed of light
Jul
2
awarded  Scholar
Jul
2
accepted Why airplanes fly: the final truth
Jul
2
comment Why airplanes fly: the final truth
Thanks, I already knew these references! :)
Jul
1
awarded  Commentator
Jun
30
comment Why airplanes fly: the final truth
Get it, thanks. Could you at last give me an advice about a good book about flight for someone with a background in physics but totally in the dark about the engineering of machines, etc?
Jun
30
comment Why airplanes fly: the final truth
Great, so what about the Bernoulli effect? It is just irrelevant because of the non-conservation of energy, or is less relevant in comparison with the action-reaction push? And which is the role of the Starting Vortex?
Jun
30
comment Why airplanes fly: the final truth
So, you are saying that even a symmetric airfoil can fly, using in that case the change of angle of attack to deflect more air up or down? But if I have a symmetric airfoil the "AoA"-like, is such that the same amount of air is pushed down and up, so I couldn't receive an effective lift. Am I right?
Jun
30
comment Why airplanes fly: the final truth
I agree, but if this was true these airfoils shouldn't fly upsidedown, as they does. Because opposing the the orientation of the airfoil, we would oppose the quantity of air pushed up and pushed down. Or not?
Jun
30
revised Why airplanes fly: the final truth
deleted 2 characters in body
Jun
30
revised Why airplanes fly: the final truth
edited title
Jun
30
comment Why airplanes fly: the final truth
Actually, this was my first explanation: due to the angle of attack, a bigger amount of air is pushed down by the wing, so pushing down more (mass) than we push up, we have a net force downward, therefore for the Newton's third law, a lift upward. Well, my professor told me this is one of the most common misunderstanding in the lift theory, because if this was true, this configuration of airfoil (without angle of attack) shouldn't fly, instead it does.
Jun
30
revised Why airplanes fly: the final truth
added 7 characters in body