View Single Post
  #100  
Old October 4th 07, 06:15 AM posted to rec.aviation.piloting
Don Tuite
external usenet poster
 
Posts: 319
Default Backwash Causes Lift?

It's curious. Nobody who's ever stood in the sllipstream of a
rotating propeller on a stationary plane says that a propeller merely
sucks an airplane through the sky. But people get into a tizzy if one
mentions Newton's third law wrt a wing. Bernoulli and Newton are not
alternatives; they are both universally and simultaneously the same
thing.

It's like those ladder-against-the- wall problems in Statics. The
forces don't change, but depending on what you're calculating,
sometimes you choose one reference point for your moments, sometimes
another.

Conservation of Energy: it's not just a good idea, it's the Law.

Don