Airfoils - How do they work?
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So we all know the high school textbook explanation of lift is incorrect. It explains that air molecules traveling over a cambered airfoil must travel faster over the top, a larger distance, in order to "meet up" with the molecules traveling along the bottom. This is wrong, as there is no physical principle or rule that necessitates that the molecules must "meet up." Amazing how often this myth is still perpetuated.
Anyway, I know that lift is predominately the result of angle of attack, in accordance with Newton's 3rd law. This is the reason why most aircraft are designed with an angle of incidence (a slight upward angle on the wing relative to the aircraft's longitudinal axis), so that they can fly level while producing enough lift.
However, I also know that a cambered airfoil, such as the one pictured, also produces a slight amount of lift at zero angle of attack as a result of its shape, via Bernouli's principle. My question is why? What causes the air to move faster over the top than bottom at zero AoA, thereby inducing lower pressure on the top than bottom? I haven't really found a straightforward explanation for this online. All resources simply state that air moves faster over the top but not why this particular shape creates this condition. This is what I'm interested in. Anyone have a concise explanation?
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I'm genuinely interested in this study.
Having seen some image from 'GMO Free USA' reposed by a person I know, complete nutter, by the way. Healing crystals and the like, which basically stated that exposure to pesticide during pregnancy is linked with autism.
I'm typically inclined to disregard the page, it being filled with absolute shit and little to no validity in their claims, though would like to know how valid and reliable this study is and what they indicate.
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I don't normally use this board, but i think i might have fucked up real bad. Can a chemistry buff please help me figure out what ive created. I put 4 parts potassium carbonate to one part potassium ferrocyanide and it hardened, gave off alot of heat, a hard white chunk was left at the bottom of the test tube and the liquid produced was a dark pink in color. I did this in a room with shit ventilation and i have an insanely bad hedache, i did this in the bottom quarter of a small test tube, so it was a miniscule amount, is this placebo or am i going to die. Also what did i produce as a product? Thanks my dudes.
Pic related, the hard bit that settled at the bottom.