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Results tagged with ground-effect
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user 1961
The increase in lift experienced by wings in close proximity to the ground.
6
votes
Why the ground effect has such a different outcome for wings and cars?
Remember that lift means the downward acceleration of an air mass. This bends the aerodynamic force vector backwards, so a small part of the pressure force acts against the direction of motion.
If the …
- 237k
4
votes
Is there ground effect flying below an infinite 2D plane as opposed to above one?
In computational fluid dynamics (CFD), ground effect can be simulated by flying two airplanes / wings in mirror formation (the lower one inverted).
That mirrored wing is only a mathematical trick. By …
- 237k
2
votes
Accepted
Is effective AoA increased at wing in ground effect?
Unfortunately, the text or the diagram never explain what the height h is. I suspect it is the height of the trailing edge over the ground, measured in percent of the wing chord. Unfortunately, the la …
- 237k
3
votes
Y force of airplane in ground effect
Ground effect happens because the air cannot flow around the airplane as it would in free flight. The impenetrable ground gets in the way, and using the mirror image in CFD is done only to create an o …
- 237k
29
votes
How high does the ground effect last?
There is no height at which ground effect is switched off. It just becomes less and less effective. There are two factors which determine how strong ground effect is.:
Height relative to wingspan: T …
- 237k
24
votes
What is ground effect?
For a simple and correct answer you need first to understand induced drag.
Please read this answer if you feel unsure.
Short version: The wing creates lift by deflecting air downwards. Induced drag …
- 237k
10
votes
Accepted
How much effect does the ground have on flight control when flying low?
At the high speed of the F-15s in the video ground effect is almost negligible. Ground effect is about the restriction of downwash by the ground, and at high speed and air density downwash is rather s …
- 237k
9
votes
When leaving ground effect, why is there a nose-up change in moment?
Koyovis' explanation is correct and deserves to be the accepted answer. However, as always, much depends on the details of the specific configuration - generalizations like those in your question dese …
- 237k
9
votes
Accepted
Were stub wings on early flying boats designed or able to exploit ground-effect lift?
In the early 1920s ground effect was not as well studied as today, so it was not considered during development. These stub wings, mostly called sponsons, were meant for roll stabilization on the water …
- 237k
2
votes
Could we use ground effect (over water) to increase an airliner's range?
Yes, but.
Flying in ground effect clearly reduces the power required to stay airborne. Accidents like the one in this question are only possible because airplanes can take off at altitudes above their …
- 237k
1
vote
Ground effect and Lift coefficient
Ground effect is complicated. That is because it actually consists of at least two effects, subsumed under a single term:
The wake cannot continue downwards past the wing, so it is deformed when the …
- 237k