What is the Principle of aerodynamics?

Question

How does an aircraft stay on air against gravity?

Answer 1

I'm going to have to direct you towards NASA for this one. It is a new concept that is making its way through the aviation industry, and it has absolutely nothing to do with Bernoulli's Principle. If Bernoulli's principle was what made an aircraft fly, it would be impossible for an aircraft to fly inverted, since when inverted that would mean that the low pressure is now on the bottom of the wing and high pressure on top. That would cause the aircraft to fall to the Earth. But anyways, if you look at a wing (an airfoil) you will notice that it is not perfectly straight. It already is attached to the aircraft with a an angle of attack of a few degrees. The best way to put it to you is to describe it as putting your hand out a car window. Now think about it. Your hand is not flat on bottom and curved on top, so why does it produce lift? It's because you tilt your hand up, creating a high angle of attack, and dynamic pressure pushes your hand up (and back because of parasitic drag.. but that's beside the point). This follows Newtons laws rather that Bernoulli's, for every action, there is an equal and opposite reaction. When the air hits the bottom of the wing, it is deflected downward, and pshes the wing upward. As for the air on the top of the wing, NASA also believes that it follows the shape of the wing and is forced downward, also causing more lift, but they are still conductiong studies on this principle of downwash. While Bernoulli's principle may be in some respects true, most scientists, physicists, etc, have agreed that it is not enough of a pressure differential to generate lift. Also, if Bernoulli's principle were the cause for lift, this would creat issues with flying in ground effect (which any pilot should know what that is all about) because ground effect has to do with air in a venturi.

Because of the fact that research about this principle is still under way, the FAA has not recognized this as being the case, and Bernoulli's Principle is what is still taught.

As A pilot, I don't think it matters too much which way my aircraft produces lift. In both theories, density altitude will still have the same effect on how much lift is produced. So as long as I know that I am alright.

Well anyways, there is still some information that I have left out, but you can find it if you check out NASA's website and just type in aerodynamic lift.

Answer 2

The word aerodynamics comes from two Greek words: aerios, concerning the air, and dynamis, which means force. Aerodynamics is the study of forces and the resulting motion of objects through the air.For any airplane to fly, you must lift the weight of the airplane itself, the fuel, the passengers, and the cargo. The wings generate most of the lift to hold the plane in the air. To generate lift, the airplane must be pushed through the air. The jet engines, which are located beneath the wings, provide the thrust to push the airplane forward through the air. The air resists the motion in the form of aerodynamic drag. Some airplanes use propellers for the propulsion system instead of jets.

Answer 3

Air craft stays in air against gravity due to the lift generated by flow of air over the wing.
Wing of an aircraft has aerofoil shape. Air passing over the wing has to travel longer distance than the air passing under the wing.

Air over the wing travels faster, than the air under the wing.

As per Bernauli's theorem, the pressure over the wing becomes lower than the pressure under the wing.

This lower pressure causes lift.

Answer 4

Ricardo, Jetdoc's were given the solutions in a nutshell. there is plenty that is going into flight, more beneficial than should be only defined the following in this talk board. For flight to take position, you want carry. carry takes position once you've sufficient airspeed going over an airfoil. An airfoil is a structure the position transferring air is made to bypass swifter over one floor than the different, and it leads to a vacuum. If there is sufficient airfoil floor to create vacuum for the load that needs to be lifted, you've flight. there's a formula...i do no longer understand it.

Answer 5

Designing aircrafts based on wind patterns and using it to fullest advantage by moving ailerons, rudders for flight and landing and best achievement in those aspects, plus efficiency of fuel consumption, and engines technology. But mostly using the Winds and the light ness of the aircraft in manufacture.

Answer 6

Go to answers.com at the search of site type principle of aerodynamics you get links go through them . If you need some more information on the same please refine your question accordingly & type them there hope fully your questions will be answered.

Answer 7

Another principle of aerodynamics can be stated thus:

Pull back, trees get smaller.
Pull back more, trees get bigger.

Answer 8

sudhir has it..read site below...GREAT stuff! Loved each and every time I sat through it's instruction.

Answer 9

.............. in a SIMPLE answer ........... Bernelle's theorem .............. low pressure created over the wing with forward motion ............. thus creating the lift ........... to sustain itself in the air ......