Why do airplanes fly Why do airplanes fly?

When the aircraft is moving at high speed, due to the special shape of the wing, the air flow above the wing is faster than the air flow below, so that the aircraft is subjected to the upward pressure of the air below, which will hold the aircraft up.

Power & Others:

The aircraft can always fly in the air because its engine blades continue to rotate and suck in a large amount of air and compress the air, mix it with gasoline into oil and gas, and then burn it in the combustion chamber, the high temperature makes the mixture expand rapidly, and the expanded gas is sprayed out from the air outlet behind the engine, which produces thrust and is also the power for the aircraft to maintain flight. As long as the throttle is lowered during the descent, the engine rotation will be slower, and the thrust will be smaller, the pilot will give the descent command to the autopilot, and then approach the runway and land according to the instructions of the air traffic control, even if the aircraft is taxiing, still open a small throttle until the plane stops at the empty bridge and brakes before turning off the engine.

When the aircraft is moving at high speed, because the wings of the aircraft have a special structure (in fact, the upper protrusion is straightened down), so that the air flow velocity above is large and the pressure is reduced, while the atmospheric pressure below will not change, so the aircraft can fly up (in fact, it is supported by atmospheric pressure).

ecmchina is very incorrect, it is not the same principle as bird flying

This is related to the problem of atmospheric pressure, because when the plane takes off, the front end will go up, and the air above will flow faster and the air pressure will be smaller, while the lower air will be the opposite, the flow speed will be slower, and the air pressure will be larger, so that the air will give the plane"Pressed it"Up , the plane flew too!

The helicopter is simple, the rotor of the helicopter rotates, exerts pressure on the air below it, and the air gives it a force of equal magnitude in the opposite direction, so that the plane is held up, if it wants to fly forward, its rotor will tilt forward, so that the air gives it an oblique forward force, and the same is true for other directions.

It's the same reason why birds can fly.

Because it is seen by you in the sky, it will fly.

I'll tell you how airplanes fly and I'll be able to answer your questions!

Newton's three laws of motion.

First Law: The velocity (v) of an object remains constant unless it is subjected to an external force.

There is no force, that is, the resultant force of all external forces is zero, when the plane keeps flying in a straight line at the same speed in the sky, the resultant force of the aircraft is zero, and the average person imagines that it is different from the imagination that when the plane lands to maintain the same sinking rate and declines, the resultant force of lift and gravity is still zero, and the lift force is not reduced, otherwise the plane will fall faster and faster.

Second Law: The momentum of an object with mass m (p

MV) is proportional to the applied force.

f and occurs in the direction of the force.

This is famous.

f=ma formula, when the object is subjected to an external force, that is, an acceleration is generated in the direction of the external force, when the aircraft takes off and taxi, the engine thrust is greater than the drag, so the forward acceleration is generated, the speed is getting faster and the drag is getting bigger and bigger, sooner or later the engine thrust will be equal to the drag, so the acceleration is zero, the speed is no longer increasing, of course, the plane is already flying in the sky at this time.

The third law: The action force and the reaction force are equal in value and opposite in direction.

If you kick the door, your foot will hurt because the door also exerts the same amount of force on you.

Balance of forces. The force acting on the aircraft should be just balanced, if it is not balanced, the net force is not zero, according to Newton's second law will produce acceleration, in order to analyze the convenience of the force is divided into the balance of the three axes of x, y and z and the balance of the bending moment around the x, y and z axes.

The axial force imbalance will produce acceleration in the direction of the resultant force, and the force on the aircraft in flight can be divided into lift, gravity, drag, thrust, lift is provided by the wing, thrust is provided by the engine, gravity is generated by gravity, and drag is generated by air.

Of course, there is also a Z direction in the Y direction, but it is not very important to the aircraft, unless it is in a turn, when the aircraft flies in a straight line at equal velocity, the drag in the X direction is opposite to the same thrust size, so the resultant force in the X direction is zero, the speed of the aircraft is unchanged, the lift in the Y direction is the same as the gravity and the opposite direction, so the resultant force in the Y direction is also zero, and the aircraft does not take off, so it will keep flying in a straight line at the same velocity.

In the case of aircraft, the x-axis moment unbalanced aircraft will roll, the y-axis unbalanced aircraft will yaw, and the Z-axis unbalanced aircraft will pitch.

Then there's Bernoulli's law.

Why do airplanes fly into the sky?

Why do airplanes fly into the sky?