Why do helicopters have long tails?

Because if the helicopter only has a large propeller, then the fuselage will also rotate according to the balance of momentum, so the helicopter must have a device that can prevent the fuselage from rotating. The small propeller on the side of the tail of the aircraft plays this role, and the aircraft makes a left turn, right turn or maintain a stable course by it. At the same time, in order not to make the tail rotor touch the rotor, the fuselage of the helicopter must be lengthened, so the helicopter has a long tail like a dragonfly.

I'll put it in layman's terms, when *** is in the air, the engine gives the main propeller a rotational moment to rotate the main propeller, but at the same time the main propeller also gives the engine a reaction force. For example, if the main propeller rotates in a clockwise direction, the engine (which is fixed to the airplane) rotates in a counterclockwise direction, and the little propeller on the tail of the airplane balances the force that causes the plane to rotate in a counterclockwise direction. Without this little propeller, the airplane would have been able to fly, but the airframe would have been spinning non-stop.

Also, as CHX4144 says, this tail is usually very long, otherwise the tail rotor needs to generate a lot of force.

Of course, there is also the possibility of not using the tail rotor, which is to stack two main propellers in opposite directions of rotation (but both are downward fanning) so that the two moments cancel out. This eliminates the need for tail rotors and long tails. Such as the Russian Ka-50

There is not only a tail. And there's a small propeller at the tip of the tail, I don't know if you've noticed.

If there is no it, when the large propeller turns, the fuselage will rotate in the opposite direction due to the reaction force. Now this little propeller is just to counteract that force. You can also control the direction.

The principle of leverage, or the tail rotor has to be made very large.

The idea of making *** resemble a certain insect to meet the needs of *** comes from the scientific judgment of dragonflies.

If there is no tail, the fuselage will rotate with the propeller, and another function is the left and right adjustment of the aircraft.

Master the balance of the ground seems to be based on the appearance of the dragonfly.

Maintain balance and adjust direction.

What is the long white tail that the plane drags when it flies in the sky?

There is a vertical one in the middle, and a horizontal one on both sides.

There are two explanations.

1.Airplanes flying at a certain altitude, commonly known in military terms as smoke pulling, all jets flying at a certain altitude will leave a clear engine trail. Wake trails are formed by the exhaust gases from jet engines that rapidly cool in the air and mix with water vapor in the air.

During the War to Resist US Aggression and Aid Korea, the US Air Force used a tactic, that is, a small group of fighters deliberately flew in the smoke layer to attract the attention of the Chinese Volunteer Air Force, and then a few kilometers above the back of this small group of fighters was a group of their main force in ambush. This tactic initially led to heavy losses for the Air Force of our Volunteers.

2.Air worm. It's easy to see this phenomenon when watching a flight stunt. It generally occurs in places such as wing tips.

Why does the sky over which the plane flies leave a small white tail.

Generally, this phenomenon is only caused by jet planes flying through the air, and sometimes a white ribbon is dragged behind the tail, because when jet planes are flying at high altitudes, a large amount of exhaust gas will be sprayed from behind the tail, and the water vapor in the air will condense into many small water droplets, which looks like dragging a white ribbon. This phenomenon usually only occurs on a clear day.

Jets often breathe long white smoke in the sky, which is called an airplane "wake cloud". This phenomenon is commonly known as "airplane smoke". When a jet aircraft flies at a fairly cold altitude with a high water vapor content, the exhaust gas ejected from the tail of the aircraft becomes an "aerosol catalyst" for artificial cloud formation, so that the low temperature and high humidity air condenses into cloud bands.

Or, rarely, the aircraft is flying in near-saturated air, where the air near the tips of the propellers and wings is adiabatic and cooled by dynamic depressurization.

The helicopter has a long tail like a dragonfly, in flight, it is a small propeller on the side of the tail of the aircraft to achieve the left turn, right turn or maintain a stable course of the aircraft, in order not to make the tail rotor touch the rotor, the fuselage of the helicopter must be lengthened.

You also have to look at it, *** is also divided into many kinds, such as Chinook***, because the body is long enough, so there is no need to use a slender "tail" to keep the tail rotor away from the main oar.

There is also the product of the Kamov Design Bureau, which is generally coaxial and reverse, so there is no need to make a tail rotor.

Because helicopters rely on small propellers on the side of the tail of the aircraft to turn left, right, or maintain a steady course. In order not to make the tail rotor touch the rotors, the fuselage of the helicopter must be lengthened, so the helicopter has a long tail like a dragonfly.