this post was submitted on 09 Dec 2023
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It's extemely easy to make gliders with and with angle of attack, and with and without curved top wing surfaces. Simple experimentation demonstrates that I'm right, fully apart from early aircraft designs that didn't have different curvature on the top and bottom surface of the wing.
Uh, okay. Airfoils experimentally outperform flat plate wings, even though it is true that flat plate with a suitable angle of attack does indeed provide some lift independent of Bernoulli. The contention I referred to was in regard to the relative proportion of contribution of either factor.
Planes can fly upside-down without plummeting into the ground, which implies to me that angle of attack dominates.
Listen, this is how modern-day-flat-earth and birds-aren’t-real type shit starts.
Let me just nip this in the bud with one word:
DRAG*
Thank you for coming to my ted talk.
*No I’m not a man in women’s clothes. There aren’t any pockets there.
It's my understanding that both elements play a role, that the relative role of each element varies conditionally, and that the precise relativity is not a solved problem.
Listen, the actual physical process is neither airfoil or angle of attack; what is actually happening is the wings are pushing the earth itself to move to the desired location of the aircraft. The aircraft itself doesn’t move at all. This is why airplanes and helicopters can’t fly in outer space .
Right... I'm saying that an airfoil without angle of attack on a glider will plummet, and a flat plate with angle of attack will glide, because air won't move faster over the top surface of the wing just because the path is longer - instead, angle of attack causes the air on the underside of the wing to slow down, and the air on the top of the wing is not slowed down (in the reference frame of the aircraft).
Flat plate wings are not preferred because there is turbulent flow induced by its movement, not because it doesn't provide enough lift.
All I said was that it's a point of some contention.
I'm just gonna go with NASA on this one:
I think the two of you are having different arguments together.
You're saying it's a contributing factor and they're saying it's not the cause. Both of these things can be true.
We are taught in school that planes can fly because of the shape of the wing. That isn't necessarily true even if it does have influence. It can happen without the wing shape. It may happen more effectively with it, but that wasn't the claim.
You can both be right here.
I'm not sure I agree with you a hundred percent on your police work, there, Lou.
The claim I see here is not that the Bernoulli effect isn't the primary source of lift, but that it isn't involved at all. They double down later saying that airfoils are used over flat wings exclusively to combat turbulence.
And my claim was simply that there has been some debate on the topic among experts, because there has.