Downwash, momentum
Hi everyone!
Im currently working on a project about aerodynamics for my physics course. Everything that was taught to me in ground school is still in my head however I want to go further into detail on the subject of "downwash".
As far as I can remember, downwash is caused by the air (from the relative airflow?) which hits the airfoil at an angle and is deflected downwards, as a result the wing is lifted. Also I know that all of this has to do with momentum.
My question is, how can the relative airflow have momentum?? And how is that momentum which hits the airfoil divided up?
Any help is greatly appreciated!
-Dave