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# How does the Bernoulli effect affect the ground effect? Answered

I have been wondering about how ekronoplans work with consideration of the Bernoulli effect. Ekranoplans such as the Caspian Sea Monster often have there engines or propellers pointing on a downward angle, this is to push as much air under the wings as possible, in doing this they are forcing the air into a constriction being the wing and the ground, now why doesn't this cause a vacuum pulling the craft down?

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The jets of the "Caspian Sea Monster" pointed over the wings. They were not generating lift, but over-coming drag.

Randomly googling images of ekranoplans, the vast majority have the thrust directed over the wings, or even nowhere near the wings.

A small proportion of smaller [modern] ekranoplans appear to have airscrews that can tilt around a horizontal axis, but they seem to be positioned to provide temporary lift directly, rather than modifying the air-flow over the wings.

I had read somewhere that the downward angle of the Sea Monsters exhaust was to push air under the wings, discarding this, there is still a lot of fast moving air under an ekranoplans wing, so how is the ground effect still in play?

The machines are fine when they get "up", but they do need air pushing under the wings to get there. You read right, but that aspect is only significant for "take-off", moving at speed it don't make much difference.

L

Bernoulli's pinciple

Ground effect

And assuming that you are a college student, accustomed to writing papers, you should know the difference between affect and effect:

Affect vs. effect

I understand both effects what I want to know is if and how the Bernoulli effect affects the ground effect?

Blkhawk, I'm afraid you failed your grammar-nazi attempt.

The title is correct, and uses both "effect" and "affect" correctly. The user is asking whether the "Bernoulli effect" (the relationship between velocity and pressure) has any affect on the "ground effect" (the additional lift/higher pressure due to velocity constriction in a fluid boundary layer).

He, he, he! The Grammar Nazi attacks again! I like that! Point taken.

In this case it's Captain Grammar, zooming in with his red, white, and blue shield of Linguistibility (not to mention an Oxford comma) to defend truth and clarity from the dangerous yet amusingly inept Grammar SS Officer. Dum, dah-dum, dah-dum-dum-dum!

I still remember my English Composition course and how we had to stick to MLA. Boy! The instructor was tough!

:-/ Heaven help you if you try to write articles for publication -- each major media outlet, and many peer-reviewed journals, have their own "style guides." Each one has a different set of idiosyncracies :-(