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Forum: Aerodynamics

03-01-2004, 03:05 AM

Replies: 262

Bernoulli's equation

Views: 29,571

Posted By drela

RE: Mark, What answer would...

I wasn't trying to "explain lift" in any way. I was explicitly stating the relationship between lift and vertical momentum (or lack thereof) imparted to the air. That seemed to be the main source...

Forum: Aerodynamics

03-01-2004, 12:04 AM

Replies: 262

Bernoulli's equation

Views: 29,571

Posted By drela

RE: well said

The ASCII graphics were really bad, so I made a quicky GIF writeup.
First drawing shows the two forces F1 and F2 on the Control Volume,
and how they must equal the momentum imbalance on the...

Forum: Aerodynamics

02-29-2004, 02:35 PM

Replies: 262

Bernoulli's equation

Views: 29,571

Posted By drela

RE: RE:The end

This is not true in general. The wing is not the only force which imparts momentum to the air in the volume --- there are also the pressure distributions on the top and bottom planes of the volume. ...

Forum: Aerodynamics

02-27-2004, 11:39 PM

Replies: 262

Bernoulli's equation

Views: 29,571

Posted By drela

RE: RE:The end

I should probably stay out of this, but I'd like to add a few points.

I don't think anybody will disagree that there is downwash directly behind a lifting wing of finite span. But to state that...

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