Why does an airplane fly like a bird without obvious flapping wings?

Why does an airplane fly like a bird without obvious flapping wings?

In the article on bird flight, we mentioned three ways to overcome the gravitational force of a bird, one of which is the lift generated by the wings (the bird can fly in the sky).

This is through wings of this shape. When the aircraft flies forward, a pressure difference can be created across the wings, resulting in an upward force. As the speed increases, the elevator will gradually increase.

When the elevator exceeds the gravitational force of the plane itself, the aircraft can leave the ground. That's why fixed-wing aircraft.

i.e. we usually ride when we travel) need to accelerate on a long runway to take off. As a rule, the speed of the aircraft is 200 to 300 kilometers per hour. When the aircraft actually flies, it is certainly not that simple, and the pilot needs to control the shape of the fins, wings, etc., resulting in a suitable lift to achieve the purpose of stable flight.

The machine must generate lift, it must move, and reach a certain speed. So what about airplanes? It is clear that it was moved by the engine as a car. The current aircraft are basically jets, some are propeller aircraft.

Jets are complex with propeller planes, and similarities exist. Here we mainly introduce the principles of jets, jets.

Understand, the propeller plane will understand.

Jet engine.

Based on Newton. The third law (force, reaction force.

always equal, in opposite directions, and in the same straight line). The principle is to inhale the air, mix the air after mixing, ** and **, and the reaction force is driven forward. Free radical.

The fan is sucked in from the air intake and compressed. The air is then divided into two parts, and one part is expelled through the prose through the hollow, and the other is through the conversation, and the hot gas (red part) is turned after mixing with the fuel. The reasons for designing interior and exterior designs, efficiency, noise, and other considerations are:

Having overcome the resistance of gravity and gravity, the rest of the plane left the ground and flew through the blue sky, taking to the sky even if the wings did not move.

Although the plane does not stir its wings in the process of flight. The airplane burns fuel to give it an upward force, so it will keep moving forward, and the principle is the same.

Because the shape of the plane is the same as the appearance of the bird, but the plane relies on a lot of technology and a lot of systems, so it can fly.

Because there is a core motivation. The aircraft is equipped with engines that provide continuous power at key locations, allowing the aircraft to fly at high altitudes.

People sit in the plane and toss and turn, and the flapping wing flight dynamics are extremely complex.

The concept of ornithopters does exist, they are a kind of birds, insects, by flapping their wings up and down to fly in the air, is a bionic machine with the highest degree of proximity to the development of birds, but the ornithopter is still in the conceptual stage, from ancient times to the present has never really created a practical and reliable ornithopter, because it is too complicated.

Principles of flight of airplanes:

The cross-section of the wing of an aircraft is generally rounded and blunt at the front and sharp at the rear, with an arched upper surface and a flat lower surface. When equal mass air passes through both the upper and lower surfaces of the wing, different flow velocities are formed above and below the wing. The velocity of air passing through the upper surface of the wing is high and the pressure is small; The flow velocity is less when passing through the lower surface.

The pressure is strong, so the aircraft will have an upward resultant force, that is, an upward lift, due to the existence of lift, so that the aircraft can leave the ground and fly in the air. The faster the aircraft flies and the larger the wing area, the greater the lift generated.

People sit in the plane and toss and turn, and the flapping wing flight dynamics are extremely complex.

Because the wings are very heavy.

Wings usually have straight wings, swept wings, delta wings, etc. The front and rear of the wing are basically straight and the front and rear edges are swept backward and are called swept wings, and the plane shape of the wing is triangular.

The former is suitable for low-speed aircraft, and the latter two are suitable for high-speed aircraft. Recently, advanced aircraft have also adopted planar shapes such as edge strip wings and forward-swept wings.

Introduction to wings.

There is an aileron on the trailing edge of the left and right wings, and the pilot uses the ailerons to perform roll maneuvers. That is, when the pilot presses the lever to the left, the ailerons on the left wing deflect upwards and the lift of the left wing decreases; The ailerons on the right wing deviate downward, the lift of the right wing increases, and the aircraft rolls to the left under the effect of the difference in lift between the two wings.

In order to reduce the take-off ground speed and landing ground speed, and shorten the take-off and landing run, the trailing edge of the left and right wings is also equipped with flaps.

The flaps are usually in the retracted position and are lowered during take-off and landing.

Motor planes must not be biological, with neurosensory tissue and musculature. Airplanes are high-speed machines, and the external characteristics of course want to fly in an absolutely stable state, and if you flapp your wings like a bird, it will increase the energy consumption and unsafe factors of flying. Hope my answer helps you, thanks!

Airplanes can't flap their wings like birds and then fly because no material has been invented or discovered to have such a function.

And generally this kind of inciting wings are load-bearing, and the effect is relatively poor.

In this case, the mass of the heavy weight is relatively small, and its stability is also relatively poor, and the technology needs to be improved.

The key to why a bird flapps its wings is that it has no speed when it starts flying, unlike an airplane. He only took off when he first ran to a certain speed on the runway. At the same time, there is no material that can enter into such back-and-forth agitation.

The principle of aircraft flight is to rely on the pressure difference between the air pressure difference between the wings of the aircraft at high speed to support the weight of the aircraft, and then rely on the traction of the engine in the flight direction to fly; It's like a bird fluttering, creating a difference in air pressure between the top and bottom of its wings.

Because if you use wings as a driving force, you know how many times the wings are stirred? Besides, if it is powered by incitement, the wings will not be strong, so use other ones as power.

Because the airplane relies on the power output of the engine, if you flap its wings like a bird, then the heavy wing needs a large and heavy moving mechanism.

The reason why airplanes do not spread their wings and fly like birds is that when flying, airplanes generally generate lift from the fixed wings of the fuselage, and rely on the power of the engine to maintain balance, so they will not incite flight like birds.

Because airplanes have engines, birds don't have engines, only wings.

Because the airplane has no life, it can't flap its wings on its own.

Airplanes are the driving force of shock! If mechanical power is used, the wings are instigated to fly, there is no stability of the fuselage! It will reduce the safety of the aircraft!

People sit in the plane and toss and turn, and the flapping wing flight dynamics are extremely complex. The concept of ornithopters does exist, they are a kind of birds and insects, by flapping their wings up and down to fly in the air, is a bionic machine developed by birds with the highest degree of proximity, but ornithopters are still in the conceptual stage, from.

Wings usually have straight wings, swept wings, delta wings, etc. The front and rear of the wing are kept basically straight and the front and rear edges are swept backward called the swept wing, and the plane shape of the wing is called the delta wing, the former one is suitable for low-speed aircraft, and the latter two are suitable for high-speed aircraft. Recently, advanced aircraft have also adopted planar shapes such as edge strip wings and forward-swept wings.

Because if you want to fly, you need to fly with thrusters, and you have to fly like a bird