Linked Questions

1
vote
2answers
408 views

Does lift generation create a vacuum over an airfoil? [duplicate]

According to Bernoulli’s principle, airflow speeds up over an airfoil which decreases the pressure, and I read somewhere that when airflow speeds up over an airfoil, this creates a vacuum. Is this ...
3
votes
4answers
115 views

Aerodynamics of lift [duplicate]

How can lift on a canvas covered airplane wing in level cruising flight be explained without introducing Bernoulli ? Both upper and lower surfaces are bulged out,which indicates lower than ambient ...
1
vote
0answers
306 views

What is the equality theory, or equal transit time theory, and is it supported by scientific evidence? [duplicate]

Throughout flight training when learning about the mechanics of lift I read and was taught this story about two molecules that part ways at the wing tip and reach the trailing edge of a wing at the ...
0
votes
1answer
136 views

Behavior of air over a wing [duplicate]

Venturi´s effect states that air over the wing accelerates and static pressure drops. There's a different theory which states that as air is viscous, once it impacts the wing, slows down... Can those ...
2
votes
0answers
116 views

What are the five leading theories for lift generation? [duplicate]

I don't know if you guys have seen the British comedy quiz show QI (brilliant show), but in episode 10 of series A (aptly called Aviation) Stephen Fry (the host) mentions that there are five leading ...
0
votes
0answers
49 views

Does air travel in the same time over the top of the airfoil and along the bottom? [duplicate]

If we assume two particles of air arriving at the leading edge, one flowing over the airfoil, the other under the airfoil. Do they arrive at trailing edge at exactly the same time?
39
votes
8answers
7k views

Why was the boat mounted this way on the underside of the wing on the “Landseaire” flying yacht?

After seeing the below image of the "Landseaire" flying yacht here I was curious to know why the small boat mounted to the underside of the plane was mounted the way it was. At least to me (and @Dave ...
41
votes
3answers
15k views

Why does supersonic flight detach airflow from a wing?

I've read in several answers to questions that when a wing passes the speed of sound the airflow will become detached from the craft towards the rear quarter of the wing (thus making things like ...
27
votes
4answers
4k views

How do I explain what makes an airplane fly to a non-technical person?

As an engineer I can explain in very technical terms exactly what makes an airplane fly, however, it isn't easily understood by non-technical people. How can I explain it to a non-technical person, ...
37
votes
3answers
9k 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 ...
26
votes
2answers
8k views

What is the purpose of the small fins on top of the wing surface of Boeing aircraft?

I've noticed on most Boeing aircraft that there are small fins on the upper surface of many of their wings. They are about one inch high and maybe two inches long (it's difficult to judge size from ...
28
votes
2answers
13k views

What is vortex lift?

In a recent question I asked, I was given an answer by Peter Kämpf and he described something about lift being created by a vortex used on delta wings and the Bird of Prey wing. How exactly does ...
30
votes
4answers
6k views

Principle of aerodynamic lift: are misconceptions also taught in flight schools?

Describing lift as the result of "equal transit time" on both sides of an airfoil is a fallacious theory widely found in technical books and articles for general public (see below for details about ...
14
votes
2answers
11k views

What is the reason for the poor low-speed characteristics of sweptback wings?

I know there are advantages of swept-back wings delaying shock-wave allowing a aircraft to fly faster. However, what are the disadvantages. I know one of them is that they have very poor low speed ...
4
votes
3answers
11k views

How does the aspect ratio of a wing impact its lift?

The wing lift formula shows that lift of a wing is proportional to its area. $ L = {\dfrac 1 2 \times \rho V^2 \color{magenta}S C_L} {\small \begin{align} &{} &&\text{where:} &&L =...

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