Why do old propeller planes have to be turned by hand?

It doesn't have to be started by hand, it can be started with a battery, but when the battery is dead. You have to use your hands, and turning the propeller by hand will drive the magneto to rotate, and when the magneto rotates, an electric spark will be generated, so that the engine can work. Therefore, it is a dangerous thing to turn the propeller of the aircraft by hand, if the magneto is not well grounded, the engine will be started outside the engine, and an accident will occur.

The six basic instruments that aircraft have are, airspeed meter, attitude indicator, altimeter, turn coordinator, heading indicator and ascent rate meter, and generally if the attitude indicator and heading indicator fail, it is also possible to fly safely. The planes are also equipped with magnetic compasses.

The manual rotation is to allow the piston of the diesel engine to move, draw in air, and at the same time spray mist diesel into the cylinder from the fuel injector. The piston compresses the air-oil mixture in the cylinder, diesels burn, and then the engine starts.

In fact, this is the same principle that some agricultural motor vehicles used to have a hand crank to shake the diesel engine to start, but now the mechanical equipment is replaced by an electric motor when it starts. Nowadays, propeller planes or various diesel and gasoline cars only need to turn the key to turn on the power supply of the motor before starting, and the engine can be started.

Since it is an old aircraft, of course, there is no starting engine.

If you look at it all with a full vision, you don't need an instrument, after all, there was no such thing as an instrument when the plane was first invented.

The principle is the same as that of a tractor to rotate by a pole! Drive the piston.

After the pilot entered the cabin, he started the engine without pressing the lever. Help from outside.

This is determined by the engine of the propeller aircraft. It uses a piston engine, and there must be a compression process before the power stroke is made, and this process consumes work. When the start-up is over, the required work can be provided by oneself, but the work must be done on it at the start-up.

Of course, it doesn't have to be hand-cranked, it can also be driven by an electric motor.

Flight instruments are not directly related to flight. They are only for auxiliary flights. The earliest airplanes could fly without any instruments.

But for the sake of flight safety, it is important to know the current state of the aircraft. So there were flight instruments. Important instruments include the indication of the aircraft's attitude, heading, altitude, etc., and then the heart of the aircraft - the indication of important parameters of the engine.

For large aircraft, since the overall situation of the aircraft cannot be observed, some instruments that feedback the flight operation are also necessary. However, the instruments of large aircraft are integrated, and all these parameters are displayed through two display units. There are buttons to switch between multiple pages.

The rotation of an airplane propeller is a rotational phenomenon.

The rotation of the propeller of the aircraft is a typical rotation, the helicopter flight is a translational motion, and the movement of the propeller is a rotational phenomenon. The translation is referred to as translation, which means that in the process of motion of the object, the trajectory of the particles on the object is exactly the same and always remains parallel. The propeller rotates the Qing Shizi, which is based on the earth as the reference system, so it is a spiral motion, that is, a rotation.

The propellers of an airplane in flight rotate from the moment they start from the ground. As the throttle increases, the propeller revs faster. In the air, the speed or pitch (deflection angle) of the propeller will be adjusted according to the needs of the flight.

If you turn off the throttle in the air, although the engine is out of power, the propeller will also rotate under the impetus of the air current, and its speed is called windmill speed.

How aircraft propellers work

When the propeller rotates at high speed, two forces are generated at the same time, one is the aerodynamic force that pulls the propeller forward, and the other is the reaction force generated by the propeller twist angle pushing the air backwards.

It can be seen from the propeller profile how the aerodynamic force of the propeller is generated, because the curvature of the front propeller surface and the rear propeller surface is not the same, when the propeller rotates, the airflow has a small pressure on the front propeller surface with large curvature, and the pressure on the rear propeller surface with a curve is nearly straight, forming a pressure difference between the front and rear propeller surfaces, thus producing an aerodynamic force that pulls the propeller forward, and this force is the power to pull the aircraft forward to fly.

Another force pulling the aircraft is the reaction force created when the blade twists backwards to push the air. The propeller is installed at a right angle to the engine shaft and has a twist angle, and when the propeller rotates, the air in front of it is sucked in by the twist angle of the propeller, and a force is added to the inhaled air to push back. At the same time, the air flow also gives a reaction force to the propellers, which is also the driving force that pulls the aircraft forward.

The above content refers to Encyclopedia - Aircraft Propellers.

The principle of airplane flight, if you want to understand briefly why airplanes can fly in the sky? can be simplified.

Introduction: Rong.

Why do airplanes fly? Despite the cooperation of various departments, the main thing is that there are two conditions: one is the power (engine), and the other is the presence of a pair of wings with a special profile shape.

According to the continuity of the fluid and Bernoulli's theorem, the velocity of the air flowing through the upper surface is faster and the pressure decreases, while the flow velocity of the air flowing through the lower surface is slow. As a result, a pressure difference is formed between the upper and lower wing surfaces. This pressure difference creates an upward lift and drag.

The drag is overcome by the thrust provided by the engine. The lift force is just enough to overcome the gravity of the aircraft and lift it into the air. When the lift is greater than the gravitational force of the aircraft, the aircraft flies.

When the lift force is equal to the gravitational force of the aircraft, the aircraft will fly level; When the thrust of the engine is greater than the drag, the aircraft accelerates and vice versa.

There are also elevators and rudders on the aircraft, and when you control the elevators, you will make the aircraft rise or fall; Maneuvering the rudder will cause the aircraft to change the direction of flight.

If you want to learn more about how airplanes fly, you can refer to professional books. In aviation school, the principles of flight are a course that requires tens or even hundreds of hours of study. It includes aerodynamics, maneuverability of the aircraft, stability of the aircraft, ......and other knowledge.

It is impossible to go into detail here.

, the motor of the electric fan is not driven to the maximum power, because the person who produces the electric fan is not dao

I want to blow you out of the gasp.

Inside, but not angry. Secondly, the real propeller engine is diesel powered and has a lot more power than your electric motor. Also, their fans are bigger, you can search for some **, that propeller is about to catch up with the height of the person!

You can compare the height of the propeller and the cockpit in **, which is obviously larger than the fan on the electric fan. Also, the engine of the Japanese Zero fighter seems to be a turboprop engine, so the power is greater than that of the diesel engine, because it directly converts the energy of the fuel into mechanical energy, and does not go through a series of transmission structures such as the crankshaft and connecting rod of the diesel engine (this junior high school should have been learned). Finally, the plane flies in the sky, and the wheels of the plane have less resistance, and the resistance of the wind encountered when moving forward (that is, the wind blows it backwards when the plane is advancing) is also small.

Therefore, the lift of the aircraft (that is, the force that can lift the aircraft upward) is mainly generated by the wings, and the force provided by the propellers does not need to be too large. In addition, when the plane is moving forward, the force to maintain flight is mainly lift, and it is the lift force that lifts the heavy aircraft. Moreover, lift is not equal to thrust, and lift is generally much greater than thrust.

That's why it's rare for airplanes to fly vertically upwards. As the thrust increases, the lift will rise sharply, so the thrust doesn't have to be too much. If you want to observe the phenomenon of the aircraft propeller pushing the aircraft forward, you can find a board, put a few ping pong balls underneath, and then put the electric fan on the board, turn on the fan, and you will see that the fan pushes the whole device.

Upstairs don't mislead people anymore, bai also turbo increases.

Du ......The original dao where the winged aircraft flies

The engine produces thrust to make the aircraft version.

Forward movement, thus right.

In the formation of the relative motion of the wing with the air. Due to the special structure of the wing, when the air passes through the upper and lower surfaces of the wing, the air flow velocity on the upper surface of the wing is large, while the flow velocity on the lower surface is small. According to Bernoulli's principle, the higher the flow velocity, the lower the pressure, so that the upward pressure generated on the lower surface of the wing is greater than the downward pressure generated on the upper surface of the wing, and this pressure difference provides lift for the aircraft to fly, so that the aircraft can fly in the sky.

The acceleration of the aircraft you mentioned, I guess you read it wrong or displayed it incorrectly, it is impossible for any aircraft to accelerate from 37 km h to 600 km h in one second, and the take-off speed is only about 200 km h. The kind of acceleration you said is impossible for people to bear, and the plane will disintegrate due to such a huge acceleration. The point is that it is impossible for the existing artificial power plant to produce such a huge thrust.

When the plane lands, the engine turns on thrust reverser and the noise increases, sounding like it would sound when the thrust is almost full on during takeoff.

The propeller of the aircraft bai and the pulp of the electric fan are different, the pulp of the zhi aircraft rotates up the dao, and when viewed from the side, its profile.

Back is an outer answer with an arc, the inside straight a shape, its shape is like a wing section, high-speed rotation, the pressure at the arc is small, the pressure at the straight is large, producing a pulling gravity, the principle is similar to the wing lift, this is the most important, and there is a reaction force to the rear exhaust air, this is smaller, these two forces add up to the power of the aircraft forward, the wing will produce upward lift after the aircraft moves, you can fly. The fact that the electric fan can't fly is not a matter of power, the key is the difference in the blades.

First of all, the screw propeller is driven by the aircraft DU engine, there are piston type and turbine type, dao must know the aircraft hair.

The power of the internal motor is greater than that of your household appliance fan, I don't know how many times, the plane can really fly, mainly after the aircraft movement reaches a certain speed, the wings of the aircraft can produce upward lift, lifting the plane.

The function of the propeller is to make the plane move and run, which is why the plane has to run to take off, it has to accelerate on the runway now, and after reaching a certain speed, the wings have enough force to pull the plane up.

I'm also figuring it out, I don't know if it's right.

That's what propulsion is all about, that thing spins more than ten times faster than your broken fan, and the area is several times larger than the fan, providing thrust rather than lift.

You're standing behind the propeller of a propeller plane, and it's going to blow you like an electric fan blowing you like a piece of paper.

Hello, the propeller on the airplane is a shield because the thrust generated by the rotation of the propeller can move the plane forward when flying. Whereas, if the propeller is perpendicular to the ground, then the thrust generated will make the aircraft move up or down instead of forward. Therefore, in order for the aircraft to fly smoothly, the propeller must be placed flat.

In addition, the rotation of the propeller can also generate lift, which is one of the important reasons why the aircraft is able to fly in the air. The faster the propeller rotates, the more lift is generated, and the aircraft is able to fly higher and farther. In addition to lying flat, the design of the propeller is also very important.

The shape, size, and number of blades of the propeller will affect the performance of the aircraft. For example, the higher the number of blades, the more thrust the propeller generates, but it also increases drag and slows down the aircraft. Therefore, propellers need to be designed with a comprehensive consideration in order to achieve the best performance.

In conclusion, the propellers on the aircraft are laid flat to enable the aircraft to fly smoothly, and the shape and design of the propellers also have an important impact on the performance of the aircraft.