PPRuNe Forums - View Single Post - Theory on lift
Thread: Theory on lift
View Single Post
Old 25th Jul 2012, 20:41
  #16 (permalink)  
awblain
 
Join Date: Dec 2007
Location: Pasadena
Posts: 633
Likes: 0
Received 0 Likes on 0 Posts
Bernoulli doesn't say anything about where the streamlines go, since it has no description of momentum conservation, although it does a good job of describing what happens along them, since it's describing energy conservation.

Newton deals with momentum.

You need both conservation laws to describe the full picture. It's also hard to picture lift without dealing with drag at the same time, as the air is slowed/made turbulent and deflected downward behind the lifted object.
awblain is offline