Why airplanes are so vulnerable

The plane and the bird are in relative motion, according to Einstein's theory of relativity, that is, the speed at which the plane hits the bird is the same as the speed at which the bird hits the airplane, so it is not difficult to understand why the high-speed moving objects collide and why it is miserable.

Your idea is good, and mankind is already trying to do this, World War II was the British in order to defend London, in the case of insufficient air defense, when the Luftwaffe attacked, a large number of balloons were released, yes, German planes did not dare to bomb London with impunity.

The cost of developing an aircraft that releases a dispersed solid substance is too high, and it is better to use an air-to-air missile, which is much more accurate and efficient than your next two methods.

The plane is afraid of birds because the relative speed of the aircraft is fast, and the force after colliding with an object is greater. If it exceeds the bearing capacity of a certain part of the aircraft, it may damage the body or parts of the aircraft, and in serious cases, it will directly threaten flight safety.

For example, if a bird hits the windshield of an aircraft, it will directly affect the pilot's control of the aircraft, and even affect the pilot's life safety. If the bird breaks the engine, it will cause the engine to stop in the air, and even cause the engine to catch fire in the air until the entire aircraft is ignited.

Your idea is good, but the actual operability is not strong!

1. How do you know where someone else's plane is? Radar, you can see people, can't people see you?

2. What kind of things are you talking about, close range? How to approach enemy aircraft? Just throw it away in case you hurt yourself.

3. If the missile is shot down outside the effective range, and if it does not play a role, the attack on civilian aircraft may still be successful, but the military is not very likely.

Because even the questions you can think of, can the researchers not think of?

The idea is good, but is it possible.

Your high-speed plane, since it can reach that speed, it is better to send a missile to solve it directly. In addition, it is difficult to cast just the right amount of scattered solid matter in the state.

There are also self-exposed missiles, it is better to directly let the missiles collide directly. High success rate. Or rather, your assumptions are unrealistic.

The plane hitting the bird is an accident, the bird is very small and agile, and the pilot cannot see it at all, which leads to the accident. And your assumption is that in a combat situation, the goal is large. Before you can cast a scattered solid, they will either dodge or shoot you down.

These are two fundamentally different issues.

Your idea is interesting, you have watched too much martial arts.

The civil aviation route is determined, and the fighters are uncertain, so if they can catch up, it would be good to directly hit them with missiles The air-to-air-surface-to-air missiles of the proximity bomb have long been available.

Because other people's planes will run too.

That's because even if you spread a range of tens of meters, it is amazing, you need a high degree of accuracy, and with that kind of accuracy, the missile can hit it, and it is more deadly, so why use scattered bombs.

Reading guide]: We have seen a lot of air crash movies in which the plane was hit by a bird, and we know that the harm caused by the plane hitting the bird is very great. So what happens if the plane hits a bird in the middle of a flight? Why are airplanes afraid of bird strikes?

Many people may think that a bird hitting an airplane is hitting a rock with an egg, and that the bird is not self-sufficient. If that's what you think, you're very wrong! The most feared thing during the flight is to encounter birds, which may lead to the destruction of the plane and the death of people!

Many people may ask what happens when a plane hits a bird, and the consequences of a bird hitting an airplane at high altitude are unimaginable.

According to scientists' calculations, if a kilogram of bird collides with an aircraft at a speed of 800 kilometers per hour, it can cause an impact force of 153 kilograms on the aircraft. The 7-kilogram Big Bird collided with an aircraft traveling at 960 kilometers per hour, creating an impact force of up to 144 tons. Such astonishing data shows that bird strikes are so devastating to high-speed planes that a small sparrow can crash an airplane's engine.

The structure of the aircraft itself is also a big factor, due to the needs of aircraft navigation, the navigation system is mostly placed in the front, and the protective shield will be weaker than other parts, more susceptible to bird impact. What happens if a plane hits a bird? If you hit the navigation system, a lot of it can lead to the crash of the plane and the death of people!

Another vulnerable part of the aircraft is the engine, the blades of which are thin and rotate at high speeds, making them more susceptible to crushing when struck by birds. The biggest weakness of the engine is that it sucks in the surrounding air with great force, and the birds that appear in the surrounding area can easily be sucked in and destroy the entire engine. What happens if a plane hits a bird?

If this happens, the chances of an accident are even greater!

Once the engine is damaged, it can only rely on other engines to hold on until it lands safely. If the engine catches fire after an impact, the pilot shuts down the engine immediately. But don't worry, when one engine stops, the aircraft can still fly on the other engines, because the aircraft is designed with this in mind, and the vertical tail is usually designed to be very large.

However, fortunately, the birds do not fly at a high altitude, they will only appear during the take-off and landing of the aircraft, and if they can respond calmly, they can still turn back or land immediately. The above is the answer to how the plane hits a bird, I hope it can help everyone.

It's a matter of physics, so to speak, a small bird is worth a cannonball!

1. Birds collide with the plane, and there are many disasters.

Why can a small bird cause so much harm to an aircraft in flight? We can draw conclusions from the momentum theorem of physics. For example, if an airplane is flying at a constant speed of 300 m-s in the air, and a small bird with a mass of one kilogram is flying in opposite directions at a speed of 10 m-s, then the bird's momentum relative to the airplane is 310 kg·m/s.

After the collision of the birds, these momentum are almost completely converted into the impulse of the birds on the aircraft, and the collision time is extremely short, about 3 milliseconds, so the impact force on the aircraft due to the collision of the birds is about 103 kN, which is equivalent to the energy of a cannonball. The contact area of a bird with a mass of one kilogram at the time of collision with an aircraft is about 0 02 square meters, so the pressure at the point where the aircraft is hit is 5 15 megapascals. Most of the current aircraft materials cannot withstand such a large pressure, which is the direct cause of various bird collision accidents.

2. If the bird is sucked into the engine.

With the development of high technology, high bypass ratio engines are more and more favored by the world's civil aviation industry because of their large power and low noise. However, the large exposure surface of this type of engine makes it more likely to be hit (inhaled) by a bird. For example, the GE engine used in the Boeing 737 has a fan diameter of 1 5 meters alone.

The engine has a frontal area of 1950 square centimeters, which greatly increases the likelihood of the bird being sucked in. Then there is the strong suction power of the engine. The Boeing 747 has an engine intake of 320 kg per second; The Boeing 767 engine has an air intake of 820 kg s; The Boeing 777 engine has an air intake capacity of 1 42 tons per second and an intake speed of 100 120 meters per second.

Obviously, as soon as the birds get even a little closer to these engines, they are bound to be sucked in. There is also the high rotation speed of the engine. The tangential rotation speed of the high-bypass ratio engine is up to 450 meters per second, and the bird hits the blades of a fan that rotates at high speed, and the energy of the impact is equivalent to the energy of a car crashing into a solid wall at high speed.

If the fan blades are broken by a bird, the debris will be thrown backwards into the "core machine" with the airflow, breaking the "compressor" blades and other parts, causing more serious consequences. The proportion of air disasters caused by these causes is extremely high. The world's bird pest experts report that engine damage accounts for nearly 100 of the 500 bird strikes.

The question is simple.

1: If the bird hits the windshield, the kinetic energy of the aircraft will make the bird smash the windshield like a cannonball, and the consequences can be imagined; If you're lucky enough to just make a hole in the windshield, the strong negative pressure and air currents can tear the glass through the breach, depending on the speed of the aircraft.

2: The aircraft uses a turbofan engine, after the bird is sucked in, the turbofan blades will be broken, causing the deflection of the central shaft of the engine turbofan to break, and the blade fragments will also be sucked into the combustion chamber, causing the engine to stop or directly cause the engine**.

3: Other impact damage and hit the windshield is almost the same, the speed of ordinary aircraft high-speed flight will make the kinetic energy of the bird become extremely large during the impact, the skin material of the aircraft can not withstand such an impact, the bird will easily crash through the aircraft shell, if the important parts of the aircraft are damaged, it is a disaster.

A bird can destroy an engine, and if it is completely destroyed, it can only be forced to land.

Last month, China Eastern Airlines 321 was hit by a bird on the windshield, and the flesh and blood were blurred, and they were all shattered.

Broken glass may not be able to withstand the pressure in the cabin and break, and in addition, if the bird hits the lowered landing gear or flaps, it may damage the hydraulic pressure or electrical circuits, which is also a serious danger.

Huh....If a bird and an airplane collide, the plane will not be destroyed. Only when a bird flies into the propeller of the aircraft, that is, the "exhaust pipes" on the wings of the aircraft, can the aircraft malfunction or even fall...The reason is simple, the more powerful something is, the more fragile it is. A high-speed machine, which was originally running according to its own operating program, was suddenly disrupted by foreign objects, causing a high-speed machine to deviate from its own operation and fall to its knees or even malfunction...

If the speed is too fast, the impact force will be great, and the principle is like a bullet.

The action of force is mutual, so it is dangerous to hit anything when flying at high speeds.

The reasons why birds can crash planes are:

According to the law of conservation of mass and the law of gravitational acceleration of physics, the high-altitude bird will produce great gravitational acceleration when flying, and when the aircraft is flying at high altitude, its flight speed and gravitational acceleration are also very huge, when the two meet, the energy caused by the relative velocity of the aircraft and the bird can sometimes reach 1.25 million Newtons or even more, which is equivalent to the force of a large cannonball, which is enough to destroy any accessories on the aircraft, such as engines, windshields, wings, etc. As a result, the plane was destroyed and people were killed.

The reasons why birds can crash planes are:

According to the law of conservation of mass and the law of gravitational acceleration of physics, the high-altitude bird rock will produce great gravitational acceleration when flying, and when the aircraft is flying at high altitude, its parallel speed and gravitational acceleration are also very huge, when the two meet, the energy caused by the relative velocity of the aircraft and the bird can sometimes reach 1.25 million Newtons very thick wheel to more, which is equivalent to the force of a large cannonball, enough to crash any parts on the aircraft, such as engines, windshields, wings, etc., As a result, the plane was destroyed and people were killed.