secret airplanes ( why airplanes can fly and drive fast )

1. Newton's laws.
According to ITB lecturer prof. Oetajo Diran, the reason the plane could fly because of newtons third law of action-reaction. lift force is a "reaction" from the "action" wing-shaped and angled in such a way that when the plane was moving, the wing will push air through it towards the bottom (known as "flow" down wash "). The same principle is true of helicopters. Propeller rotation will push air downwards to generate lift force that causes the reaction plane in the air.
Action = F - F reaction

2. Bernoulli's law.
The sound of Bernoulli's law is the amount of pressure (p), kinetic energy of unity volume (1 / 2 ρv2), and the potential energy per unit volume (ρgh) has the same value at every point along a flow line.
Match Bernaulli equation will be obtained:

F = FB - FA
F = (PB - PA) A
F = ½ ρ (v2B - v2A) A

As for some other opinions about the aircraft could soar because of the Law Bernolli. Bernoulli's law essentially said, higher-speed air pressure is lower and vice versa. The wing has a profile form so that the speed of air flowing on the upper surface is higher than the air flow beneath the surface. Therefore, the air pressure at the top of the wing is lower than at the bottom of the wing. This is what causes the emergence of the lifting force on the wing.
In addition, a statement which was so visionary da Vinci is the method of separation. Approximately 1500 years ago, da Vinci has been suggested that in order to be able to fly enough is done with fixed wing and gave him a thrust. This is based on the results of observations of the techniques for flying birds.
According to da Vinci, the wings of birds consist of two parts which have their respective functions. The base of the wings of birds that are relatively fixed (fixed) serve to generate lift. While the bird's wing tip functions to pack and generate thrust. Separation force into lift and thrust is that until now used to create the machine terbang.Lalu how airplanes can fly? Is something wrong if we think that the engine (engine) is causing the plane can fly.
Basically, the wing was the one who gave the lift force needed for flying, while the engine just gives the thrust (thrust) to bengerak forward. So easy conclusion is that the aircraft (not aircraft antarikasa) can fly because they have sayap.Pertanyaan next, how to lift (elevator) can terbangkit in the wings?
Can easily be explained that the lift force awakened because of the differences in surface pressure upper and lower wing surfaces. Wing airfoil shapes are created in such a way as to create flow characteristics that match the desire.
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In short, there will be a lifting force when the pressure below the wing surface is higher than the pressure above the wing surface. This pressure difference can occur because of differences in air flow velocity above and below the surface of the wing. According to Bernoulli's law, the faster the velocity the lower the pressure.
The amount of lifting force generated is proportional to the wing surface area, air density, the square of velocity, and coefficient angkat.Jadi style, for aircraft, engine function is to provide the thrust to the aircraft can move forward.
As a result of the aircraft forward movement occurs relative movement of air in the wing surface. With certain airfoil geometry and angle of attack wings (angel of attack) it will generate a certain air flow characteristics of the wing surface, which then will create a pressure differential on the surface of the upper and lower wing surfaces which then generate the necessary lift force to fly.

The translation of these, whether the law Bernoulli wrong? not the case. Bernoulli's law remains valid, just not always true that the air velocity at the top of the wing is higher than the bottom wing. In fact the nature of air is not a Bernoulli IDEAL in the legal framework. the mechanics of flying, the dominant factor affecting the amount of lift force is calculated not from the large pressure difference between the two wing surfaces, but based on the size of the "attack angle" (angle of attack) aircraft, which is very easy to explain with Newton's laws than with Bernoulli's law .

In conclusion, the fact that lift force is discussed both with Bernoulli's law or Newton's laws is the force that the same thing. Bernoulli's law ideally explain the basic principles of the aircraft, but not in terms of engineering. Translation of the forces that work in the science of flight dynamics continue using Newton's laws.

Bernoulli effect is not everything in making aircraft fly, but he can not be ignored. Because of differences in air pressure cause the acceleration (speed difference) rather than vice versa. In this site it is said that the acceleration is caused by tangential flow (fluid flow curve). Tangential flow can occur as a consequence of air friction that causes the fluid to follow a curved geometry wing. This phenomenon is known as Coandă effect. Detailed descriptions on the website.

In aerodynamics, the aircraft pushed forward because of momentum from the impulse engines. on the wing in the set with a form such that the air flow velocity in the upper wing akanmenjadi greater compared with air velocity at the bottom of the wing. Air velocity above the wing is greater than under the wing of mileage in because the air flowing layer on top of the wing is greater than the distance traveled under the wing. travel time through the layer of air above the wing and under wing is the same. According Bernoully concept, big air velocity causes the small air pressure. so that the air pressure above the wing to be smaller than under the wing of an airplane. so that the lift force planes occurred.

So the smaller the weight of the aircraft, the lower the speed required for flight.
Usefulness of the wing on the aircraft is to make a difference in wind speed at the top of the fuselage and under the fuselage. Wind speed at the top of the fuselage is faster than the wind speed at the bottom. In giliranya, this will trigger the air pressure differential above and below the fuselage fuselage. Air pressure above the fuselage will be smaller under the fuselage, so that the aircraft could look up to the top.

During the flight, There are four forces acting on the aircraft during flight is lift force (LIFT) or upward force, the weight force (weight) or downward force, then force forward (thrust) and the backward force (drag). The following two styles can be easily understood. Gravity (weight) to work pulling things back to earth,


Other styles that work on the aircraft during the air that is LIFT and thrust both of which are key to flight. These forces by the designers of aircraft into account to overcome the drag and weight. Lift (LIFT) is produced by the surface of the wing that is designed so that air pressure above the surface is smaller than bagiah below. Other forces working to keep the aircraft remains in the air that is thrust. This force pulling the plane towards the front, this style is usually obtained from round the propeller (propeller) engine or drive a jet engine. Advanced style (thrust) and lift (LIFT) will work together to pull the plane towards the front and leave the land ..