Will
Again I only ask that people think for them self. We have all read Marchaj's books. I have every book he wrote. Marchaj didn't come up with these theories, he only rewrote them. Secondly your referance to John Denker's page does not in any way "kill" the Coanda arguement. I have read all of Denker's theories and again he did not create them, he simply restates them. Denker's barn door analogy is an excellant example of how wrong he is. The air flow "or water" will adhear to a flat plate at low angles of attack. If you don't believe it, try it in the sink with a sheet of plastic or metal. One of the mistakes he makes is using a fast stream that is broken and full of air. Just like a cavitating prop, the water will not adhere as well when mixed with air. Again the coanda effect doesn't create lift. Changing the direction of the air flow does. You can't just say that Newtonian physics does't apply to wings. It does, it always has and always will. The ONLY way to create lift is by changing the direction of the fluid flowing past the wing. The forces must be equal and opposite each other. Another on of the completely ridicules arguments by the "circulation beleivers" is that air is like "be bees" shot from a gun and bouncing off the bottom of the wing. I think we have all seen the diagrams of the wing with the be bees flying at it. There explination is that the only the air that strikes the bottom of the wings would change direction and therefore Newtonian physics can only account for a fraction of the lift. Use a little bit if common sense here and look at there diagram. If air were like be bees, there would be a perfect vacuum behind the wing because the wing has deflected those be bees away. Air is not like be bees, it's a fluid. Take a look at any of the diagrams in Marchaj's books of the fluid flow around a wing or sail. Look at the direction of the free fluid flow well ahead of the wing and look at the direction of flow behind the wing or sail. If there is lift, there is a directional change in the fluid flow. This whole circulation theory comes out of a misunderstanding of the Kutta-Joukowski lift on a rotating cylinder. The rotation of the cylinder is causing a change in the directional flow of the fluid flowing past the cylinder. See this link for a complete explination.
http://www.lerc.nasa.gov/WWW/K-12/airplane/beach.html .
