how does Bernoulli’s Principle lead to flight?

Answer 1

Bernoulli's principle says that a rise (fall) in pressure in a flowing fluid must always be accompanied by a decrease (increase) in the speed, and conversely, if an increase (decrease) in , the speed of the fluid results in a decrease (increase) in the pressure.
The principle is used to produce "lift" of the wings of an aircraft. The wing is shaped such that the length of the top surface of the wing is longer than the bottom surface (in the direction of travel of the wing). Since the air is split at the front of the wing and joined again at the back of the wing, the air must travel faster over the top of the wing (longer distance to travel) than over the bottom surface of the wing.
Bernoullis principle says the faster moving air over the wing leads to a low pressure compared to the slow moving air causing a high pressure under the wing.
Thus the high pressure under the wing "pushes" the wing up against the lower pressure above the wing so the wing rises....carrying everything else it is attached to with it.

Answer 2

From the attached article:

In some textbooks and general references, Bernoulli's Principle is the sole explanation of lift. However, this explanation is incomplete. Newton's Laws must also be considered. For instance, the effect of camber creates lower pressure and it forces air down. According to Newton's 3rd Law, the reaction of the air being pushed down is that the wing is pushed up.

Bernoulli's Principle, although never considered by the Wright brothers, helps to explain the camber and efficiency.


"Bernoulli's Principle" states that when the velocity of a fluid is faster, the pressure of the fluid is lower. In contrast, this means that slower moving fluids have higher pressure.



Bernoulli's principle applies to flight in the following manner: Air passes faster over the top of a cambered wing and therefore results in lower pressure. See the diagram below. As you can see, the top of the wing is curved. The air that passes over the top of the wing moves faster because it travels a greater distance in the same amount of time as compared to the air that passes under the wing. Lift is created because the air under the wing is slower and exerts higher air pressure. The differences in pressure create lift.

Speed of the air matters! This is why birds and planes take off into the wind! Imagine a plane sitting on a runway during a hurricane. Imagine the wind blowing over the wings from the nose to the tail. How would you expect the plane to behave? (Assume that the wind will not blow the plane end over end.) Answer: The plane would rise!

Answer 3

I don't know how should this principle lead to flight... but I know that an application to this is the Prandtl tube, which is able to measure the speed of an airplane in flight when attached to it.

Answer 4

because the airplane is "displaced" by a fluid, in this case the fluid is air! it is this displaced fluid that allows the plane to be held up in the air!

Answer 5

Fly lift and thrust