Well, here , a movie that shows that " spoon effect" is possible to obtain a large area, no such model of the wing , set " bellies " to each other. Between the wings , air is blown using an ordinary hair dryer .. The second part of the film , you will see that blowing this way only one wing , we can feel the hand , there is some lift of the wing . Simply it is so microscopic that it can not feel , despite the fact that once we're blowing on the wing , then do not . I do not feel any difference. The reason is also that the air dryer has a very low speed, and it is relatively very little ..
However, as we hold as two wings . set ' bellies to each other, and kept at one end , the other end , a very intense vibration , bouncing off each other, as a result of blowing the hair . the film do not really see these vibrations because their speed is high , as the camera does not records so quickly. records and revealed that the image of " waving wings. " In a time while also heard the " clack " of themselves striking the wings .. so attractive force them to each other must be large, as seems the powerful sound of beats between them. wing to descend , and then diverge , and again, there are withdrawal force with each wing , and so the circle. But fairly quickly , despite the relatively large area of ??the wings in relation to a small air stream flowing between them ..
In any case , it is this force several times to each side of the Astringent greater than the lift of a single wing , which you can not even feel that there is in these conditions ..
Flat Venturi designer Andrew Feliks - YouTube