William Beaty wrote: > On Tue, 6 Dec 2005, Rick Monteverde wrote: > >> I don't believe the pressure differential is the full source of lift, > > There are no forces on the surface of a wing EXCEPT those of air pressure. > > If you disagree... then you need to explain in detail what these > non-air-pressure forces are. > > But I already know the answer. It's simple: Pressure differentials > explain 100% of the lifting force, while flow-deflection (the acceleration > of fluid masses) also explains 100% of the lifting force. These are > simply two independant ways of attacking the problem. There is no > competition between a "Bernoulli" viewpoint and a "Newton" viewpoint. > This is just another way of saying that the Bernoulli equation ends up > obeying Newton's laws. Or in other words, if the water is deflected, > there MUST be a pressure differential which causes a lifting force... and > if there is a lifting force, then the water MUST be deflected.
I don't think the two explanations are equivalent. During level flight the Bernoulli explanation DOES NOT predict that the fluid leaving the wing tip will be directed downwards. Harry
