What causes a lifting force on an airplane's wing design?

In summary: This is not related to how a wing generates lift, but rather the deflection and stresses caused by the distributed load. Similar images can be found by searching for 'beam deflection'. In summary, the image does not contradict the concept of how a wing generates lift, but rather shows the deflection and stresses caused by the lift force on a wing.
  • #1
ChloeYip
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Member advised to use the homework template for posts in the homework sections of PF.
As I know, lifting force is because the surface of upper side of the airfoil is longer than the bottom side, causing the pressure of down side larger and produce lefting force...
this is a picture from my lecture notes, which the instructor didn't explained but seems contradict to what I knew...
Anything wrong with my mindset? can anyone help to explain the picture?
Thanks.
 

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  • #2
There's no contradiction.
The image is nothing to do with how a wing generates lift, it shows deflection and stresses due to a distributed load (which happens to come from the lift force).
You'll find many similar (albeit mostly upside down) images if you google 'beam deflection'.
 
  • #3
A lifting force coexists with downwards deflection of the air flow relative to the wing. In the case of a thin wing, the upper and lower surfaces have the same length, and they don't need to be curved. A thin flat wing at some angle of attack can generate lift (at the cost of increased drag compared to more efficient wing shapes).

As posted by billy_joule, the image shows an exaggerated example of a wing flexing under load, as viewed from behind (or in front) of an aircraft.
 

What is the lifting force of an aeroplane?

The lifting force of an aeroplane is the force that is generated by the wings of the aircraft as it moves through the air. This force is created by the difference in air pressure above and below the wing, known as lift, and is what allows the aeroplane to stay in the air.

How is the lifting force of an aeroplane calculated?

The lifting force of an aeroplane is calculated using a mathematical equation known as the Bernoulli's principle. This equation takes into account factors such as the shape and surface area of the wings, air density, and the speed of the aircraft to determine the amount of lift generated.

What factors affect the lifting force of an aeroplane?

The lifting force of an aeroplane is affected by several factors, including the angle of attack, air density, wing shape and surface area, and airspeed. Additionally, the weight and distribution of the aircraft's load can also impact the lifting force.

How does the lifting force of an aeroplane change during flight?

During flight, the lifting force of an aeroplane can change as the aircraft's altitude, airspeed, and angle of attack are adjusted. For example, when an aeroplane gains altitude, the air density decreases, and therefore the lifting force also decreases, requiring the aircraft to adjust its angle of attack to maintain equilibrium.

What happens if the lifting force of an aeroplane is too low?

If the lifting force of an aeroplane is too low, the aircraft may not be able to generate enough lift to stay in the air, resulting in a loss of altitude or even a potential crash. This can be caused by factors such as a decrease in air density, an increase in weight, or a decrease in airspeed. Pilots are trained to recognize and address these situations to ensure the safe operation of the aircraft.

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