3 ms·
Haha this is a fantastic answer. Also, not most of the effect, all of the effect. Do the same experiment with the paper, but rest the trailing edge on a table.
by 0xfaded 10y ago
Haha this is a fantastic answer. Also, not most of the effect, all of the effect.
Do the same experiment with the paper, but rest the trailing edge on a table. The air can no longer be deflected downwards, so the paper will not rise.
Another one to think about, at the air metal boundary the air is stationary on both sides of the wing. So why is there a pressure difference? Bernoulli's law is valid only along flow lines and is a consequence pressure difference required to accelerate (or decelerate) a fluid. Since in the laminar situation flow does not occur from the top surface to the bottom (minus around the tips), direct application is nonsensical. If you integrated all flow lines from all surfaces however, you would get the correct answer.
- cyberferret 10y agoWell, I just instantly disproved your hypothesis by holding a piece of paper against the front edge of my desk with it curving up and the trailing edge resting on the flat of the desk, then leant down and blew over the top of it... and the paper lifted at the back. QED. Not sure why people are looking at the situation as ONE Venturi plane. What I am trying to explain is that there is effectively TWO - and expanding one over the top of the wing leading to a low pressure effect, and a constricting one below the wing leading to a high pressure situation. I wouldn't say that both provide equal amounts of lift, but the paper experiment, and the 747 in the boneyard proves it to a point.