Linked Questions

31 votes
6 answers
7k views

Why the ground effect has such a different outcome for wings and cars?

I have some confusion concerning the ground effect. If we take two applications: Aircraft and Cars, they seem to have completely opposite effects. Aircraft From Ground effect (aerodynamics), we can ...
ROIMaison's user avatar
  • 7,447
36 votes
3 answers
13k views

How does an aircraft form wake turbulence?

This question discusses how wake turbulence can affect planes flying in formation. It got me wondering, how do aircraft (the wings in particular) form wake turbulence to begin with? It can't be as ...
Jae Carr's user avatar
  • 24.2k
11 votes
4 answers
4k views

Why do airfoil's trailing edges point downward?

The trailing edge of and airfoil is mostly pointing downward. Is there any reason for that? Down wash increases drag and down wash is due to the direction of air pointing down. If the trailing edge is ...
Selva's user avatar
  • 741
13 votes
2 answers
44k views

What is the method to calculate a finite wing's lift from its sectional airfoil shape?

I am struggling to get my head around a concept that I believe should be fairly simple to understand. Lift versus drag and AoA data of many airfoils are freely available, for instance the NACA 4-...
Jonny's user avatar
  • 2,038
12 votes
4 answers
4k views

Can a helicopter operate continuously in a small, enclosed, sealed environment?

Many years ago I had an interesting discussion with a friend (while drinking). We were discussing what would happen if a helicopter was placed into a sphere of some size (slightly larger than the ...
Steve's user avatar
  • 2,218
7 votes
2 answers
2k views

Why there is no wake turbulence right after touch down or before rotation?

It is said that wake turbulence occurs when an aircraft generates lift and there is no wake turbulence after touch down or before take off. That's how we avoid wake turbulence. However, I've thought ...
Mun's user avatar
  • 1,837
10 votes
1 answer
2k views

Were stub wings on early flying boats designed or able to exploit ground-effect lift?

I came across a link to the Dornier Do X, and the Boeing 314 Clipper in another question, both aircraft have similar short wings/floats low on the fuselage, described in one wikipedia article as "stub ...
Andrew M's user avatar
  • 203
6 votes
2 answers
2k views

The stronger the headwind the faster the plane flies if it is in the reverse command regime?

Revision 3. Clarifications, as required by moderators, added. The main reason for asking the question provided. Regarding the reverse command regime of a plane Assuming a plane hovers (ground speed $...
Robert Werner's user avatar
2 votes
2 answers
1k views

What is the difference between ground effect for an infinite wing and for a finite wing?

A question about ground effect has just reappeared. I think one needs to differentiate between ground effect for a finite wing (3D flow) and ground effect for an infinite wing (2D flow). What are ...
user avatar
2 votes
4 answers
430 views

What is formula for induced drag in stalling regime?

I'm wondering what is the formula for induced drag in a stalled regime, i.e. in a regime where the $C_L$ (coef. of. lift) has started to decrease but is still nonzero. I've a feeling that the ...
agronskiy's user avatar
  • 223
4 votes
2 answers
126 views

How does ground effect work with a banked wing?

How would an explanation of ground effect such as this one from Peter Kämpf be modified to account for a highly banked wing? A paraglider and HP canopy pilot told me that when he banks a wing to touch ...
Oleg Pryadko's user avatar