ORIGINAL: 2slow2matter
Actually, I never said that I could explain it all. In fact, I said that it is not totally understood by anyone, much less me. I can get my planes to fly at much higher than 15-20 degrees of AOA, but only if applying thrust and the plane is moving forward. However, when little to no thrust is applied, then yes, the AOA must be lower than that or the wing will stall--again, "my" theory supports this because as a higher AOA is achieved, the plane will bleed off energy in a hurry, due to excess drag. As the energy goes away, so does forward movement, airspeed decreases, and the wing stalls. However, if you are landing into a strong wind, then the wing can support a much higher AOA without stalling--this is because although groundspeed is decreasing, airspeed remains high.
A person can find a website that explains just about anything, just about anyway they want it to. That doesn't make it right--there is a lot of false information on the internet. However, that doesn't make me right either. I'm not pretending to totally understand it, and I'm not disputing the information on your website. I would say that anyone who claims to totally understand why airplanes fly is probably wrong. I will say, though (and I think we agree on this) that Bournelli has very little to do with it. If it did, then when you go inverted, the low pressure would suck you to the ground, without much recourse for you as the pilot.
BTW, and this is just based upon my experiences with RC, and this is totally my opinion, but I believe my flat bottom airfoils produce much more lift at lower airspeeds than my symmetrical airfoils do. This can be seen when landing. My flat bottoms glide forever, my semisymmetrical airfoils are fairly easy to land, but don't glide near as far, and my symmetrical wings I have to "fly" to the ground.
BTW, I love debates like this. I'm not arguing. This is my kind of thing!
Also, this is by no means "my" theory, it's just the one that makes the most sense to me, considering my background and what I've been taught.
Unless they have re-written all the laws of physics and flying in the last 10 years, your wing will still stall at 16 to 18 degrees AOA no matter how much wind or thrust you put to it. Some wings vary, but they all stall. The only reason you have planes hovering is that they produce more thrust than the have wieght. The wing is not flying per say when the plane is hovering. On your trainers, the wing is made to produce higher lift. Thats why it floats. Fully symmetrical wings are faster, but don't float as well, therefore you have to fly it to the ground. Both bernouli and newtons theories are at work on most wings. Its kinda like arguing pitch versus power to hold alt and airspeed. Change one, you have to change the other.
You can argue these things all day long with people that see it only one way. Usually your arguing with people that know a little theory, but have never experienced it in the real world.