I'm studying for the ATPL "principles of flight" exam. The Bernoulli equation is used to describe how an aircraft wing generates lift. However, I came across this very interesting website (below) that posits a physical description of lift. It suggests that the action:reaction of directing air downwards is the main contribution for lift generation and the Bernoulli lift contribution is small. It says that a Cessna 172 at 140kts displaces 5 tonnes of air downwards per second to produce lift. It's well worth reading but I don't know wheather to trust the information. Does anyone have an opinion on this ?
http://www.aa.washington.edu/faculty/eberhardt/lift.htm