Linked Questions

2
votes
1answer
7k views

How do symmetrical airfoils generate lift? [duplicate]

It is widely understood that the curved shape of a typical airfoil (such as a Clark Y) causes a pressure difference that creates lift. How do symmetrical airfoils do this when the top and lower ...
0
votes
1answer
620 views

Is the airspeed different between above and under the wings? [duplicate]

I heard that when an airplane is flying, air speed or air pressure is higher under the wings. Is it true?
1
vote
1answer
874 views

What really causes a low-pressure gradient over the top of an aerofoil? [duplicate]

As air flows over the top of an aerofoil the pressure drops. Compared to the high / normal pressures on the underside, a pressure gradient is formed with higher pressure further above the wing. You ...
3
votes
4answers
132 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 ...
-9
votes
1answer
293 views

What makes Airplane Fly? Does Bernoulli Principle still Reliable? [duplicate]

Even the earliest airplanes did not apply Bernoulli principle. The wings were flat, and it worked. An honest engineer admitted that 'take off' is a mystery. Is there alternatives for Bernoulli ...
-4
votes
3answers
413 views

Why do modern aircraft have a slope on top of the airfoil? [duplicate]

I recently learned that the pressure on the bottom of the wing is increased, and air moves faster on the bottom part of the wing. The speed of the air on top of the wing is not increased. So I am ...
0
votes
0answers
57 views

What is the reason for circulation of air around an airfoil? Based upon the circulation of air, why are airfoils shaped the way they are? [duplicate]

Foreword: I am an Aerospace Engineering student and next year is my third and final year, starting September 2019. I was taught approximately 2 semesters ago that the correct theory of lift is that ...
89
votes
14answers
16k views

Are wings any more efficient at creating lift, versus orienting the engine's thrust downwards?

As I understood from this article, wings on an airplane basically create lift by pushing air down. Maintaining the lift force expends energy because air needs to be continually accelerated downwards. ...
28
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, ...
39
votes
3answers
10k 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 ...
13
votes
5answers
7k views

Why are wings load tested upside down?

Why are wings load tested by putting weights on the underside of the wing (placed upside down)? A wing is being pulled into the air from its upper surface in flight, so shouldn't it be load tested in ...
24
votes
2answers
4k views

Why is the wrong explanation of “air travels a longer distance and creates a lift” so popular?

When I was learning for my license, one of the first diagrams I remember was about the wing profile. The air going around the wing and on the upper side it has to travel a longer way, thus generating ...
14
votes
7answers
7k views

Why does a stall decrease lift, rather than increasing it?

A stall occurs when the angle of attack of a wing or other airfoil becomes so high that the airflow over the upper surface of the wing separates from the wing, rather than remaining attached to it; ...
15
votes
7answers
2k views

How would you explain Bernoulli to a nine year old?

This is a aviation principles question coming from my nine year old daughter that I need help with. I was explaining to her the principle of flight and the fact that you need airflow under the wing in ...
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 ...

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