Rick, Ok thanks...sorry about my slow response. If this effect is the primary cause of lift then if the flaps on the wing of a plane are turned up then you would expect the plane to descend. Instead a plane will climb.
Harry Rick Monteverde wrote: > Harry - > > I did the vacuum experiment years ago so details are a little hazy, but > basically it was a jar with a small diameter (1/8" I.D. I think)tube > sticking through the lid. Inside the jar was a small airfoil section > made of modelling clay, suspended vertically with the tube pointing at > the front/top surface. Basically like the spoon/faucet setup, but with > an air jet instead of a faucet. Vacuum pump is high capacity relative to > the small air inlet capacity, so when allowing air to flow in through > the tube, the vacuum still stays fairly high - so all the significant > air action is just the flow hitting the top side of the foil. The foil > pulls into the airflow, just like the spoon in a water flow. And I'm > pretty sure, mitigated by the absence of any real measurement, that the > pressure on the top of the foil was mostly higher than on the bottom. > > - Rick
