does the wind that goes over the wing of a plane create a vacuum that sucks the plane into the air?
930040
Air travelling above the wing is at a higher velocity than that travelling below the wing. High v = low pressure (Bernoulli's eqn) therefore the higher pressure under the wing generates a resultant force towards the lower pressure and pushes the wing upward, creating lift.
1182585
Technically, depending upon the type of airplane and speed of the head wind, a plane can "hover".  As long as air moves over the surface of the wing fast enough to create enough lift to make the airplane fly, it will fly--it just may not have very much forward speed.\nWhy does an airplane fly?  The Bernoulli principle.  Air flowing around the wing does so at two different speeds due to the shape of the airfoil.  It flows around and over the top more quickly than along the flat bottom of the wing.  This creates higher pressure on the bottom pushing up.  As long as there is enough push to overcome gravity (or weight), the plane will fly. You might ask, then without moving forward and in no wind, how does a helicopter fly?  Well, its airfoils are always moving through the air as long as it is running--the rotors are its wings.
354185
The short answer is, the same way all fixed wing aircraft do.\n\nWings on aircraft product lift, by taking advantage of something called Bernoulli's Principle. It says, in essence, that faster moving air causes air pressure to be lowered. You'll notice that the upper surface of aircraft wings are curved, and have more length to them than the underside of the wings. Since the airflow over the wing's surface has a greater distance to go on top than on bottom, the speed of the airflow is faster on top of the wing, hence lower pressure.\n\nStill, the best designed wing in the world won't help an aircraft get airborne without something known as the thrust/weight ratio. The P-47 was a very heavy aircraft in its day, but had a massively powerful radial engine that produced more than enough thrust to get it airborne and let Bernoulli's Principle take over...\n\nA great aircraft with an impressive war record.
630748
The more wind the higher the waves.\n\nWhen wind blows over the ocean's surface, it creates waves. Their size depends on how far, how fast and how long the wind blows. A brief, gently breeze forms patches of tiny ripples on the surface called catspaws; strong, steady winds over long distances create large waves. But even when you feel no wind at all, you may encounter large swells created by distant storms.
1126325
It's similar to the Venturi Principle, where the jet creates a vacuum effect as it punches a "hole" through the air above the water. Since nature proverbially abhors a vacuum, the surrounding air and the water beneath the hole rush to fill it.\n\nYou can create a similar effect by directing the stream from a compressed air blower between two parallel pieces of streamer material. You would think that the pieces of crepe paper would split away from one another; actually, they tend to come together.
1077367
An aircraft flies due to aerodynamic reactions that happen when there is relative motion between air and a wing.\n\nIf a cross-section of a typical aircraft wing is viewed, the top of the wing can be seen to be curved downwards, while the bottom of the wing is less curved or straight, but angled to the airflow. This shape, called an airfoil or aerofoil, creates lift when it travels through the air. However, this optimisation is not applicable for aerobatic aircraft, which need to fly inverted, or for supersonic aircraft.\n\nLift is created as an airstream passes by something which deflects it. The force created by this deflection of the air creates an equal and opposite force on the wing according to Newton's third law of motion. The deflection of airflow downward during the creation of lift is known as downwash.\n\nNearly any shape will produce lift if curved or tilted with respect to the air flow direction. However, most shapes will be very inefficient and create too much drag. One of the primary goals of wing design is to devise a shape that produces the most lift while producing the least lift-induced drag.
397146
A combination of two factors. Very basic answer here:\n\n\nNewtons' third law: for every action thee is an equal and opposite reaction. (air hitting the bottom of a wing forces the wing upward)\n\nBernoulli’s Principal: As the velocity of air increases, its pressure decreases. Wings are shaped as that the air travels faster over the wing creating a low pressure area. This area of low pressure over the wing 'sucks' the wing upward.
1152217
Yes since it would reach it's terminal velocity after a few feet. &  DUE TO THE DRAG IT WOULD NOT ACHIEVE THE SPEED OTHERS are THINKING IT  would ACHIEVE.Given that air is present .
1162285
Aircrafts' wings gives the aircraft lift (i.e. shaped so that when wind passes through, it will be pushed up), and once a certain velocity is reached, the upwards lift is enough to counteract the forces of gravity (and exceed it), and thus they fly.\n\nSpaceships achieves escape velocity to escape from the Earth's gravitation (or at least far enough for the space ship to reach orbit). Then, at the orbit, it orbits earth at a certain velocity which gives it enough velocity to counteract the remaining attraction from Earth's gravity, hence it stays in space.
14321
First, look at any typical airfoil shape. It is sort of teardrop shaped, with a round end and a pointy end, but not symmetrical--one side seems flatter than the other. Let's imagine that the pointy end points to the right, the round end point to the left, the flatter side is on the bottom and the rounder side is on top.\n\nLet air flow from the left to the right. Air flowing near the airfoil at speeds that are not too fast (less than the speed of sound) is not compressible. Let's follow two tiny blobs of air that start next to each other, but approach the round end of the airfoil in such a way that one blob goes up and over the airfoil, while the other slides over the bottom. These two blobs will arrive at the pointy end at approximately the same time. But, the one going up and over as a longer path to take and therefore must travel faster. All the air molecules in a blob are actually thrashing about randomly and can collide with other air blobs nearby as well as the upper surface of the airfoil. This is true of the upper blob and the lower blob. But, if the upper blobs average speed is faster, then its molecules collide with the upper surface of the airfoil less over the trip from round end to point end than do the molecules in the lower blob. Therefore the pressure caused by the collisions of the molecules in the upper air blob on the upper side of the airfoil is less than the pressure on the lower surface caused by collisions of the lower blob's molecules with the lower surface. This means there is a difference of pressure between the two surfaces--pressure drops as you go from upper to lower surface. If the airfoil is rigid, then this difference in pressure will become a force exerted on the airfoil from below, called lift. This lift is what makes an airplane rise on takeoff as it rushes through the air with its wings whose cross-sections are airfoil shaped, rounded end into the oncoming air and flatter side towards the ground.
754264
Conservation of energy is what the bernoulli's theorm states\n\nSo by thumb rule, When velocity increases the pressure drops to maintain energy conservation. In orther words when velocity falls down pressure increases.\n\nThe airfoil (wings) lift is by severe air pressure drop over the wings.\n\nAlso by air speed when allowed through the venturimenter can measure the speed of the flight too\n\npls see the references.
338795
No. For airfoil shapes, drag is minimized by keeping the surface as smooth as possible (and as a result the airflow over the wing smooth as well). \nThis is not necessarily true for other shapes. For a sphere, drag can be less when the airflow is turbulent instead of smooth. As a result, the dimples on a golf ball (a rough surface) reduce the drag on the ball.
261284
Prevailing winds off the coast of Africa blow hot air over the relatively cooler ocean. Given that hot air rises, this creates a zone of low pressure that rotates given the Coriolis effect. As the hot air blow over the ocean, it causes a higher rate of evaporation. As more and more moisture is pulled from the ocean, it produces more powerful rainclouds that quickly turn into thunderstorms rotating around this center of low pressure. This is the engine of a hurricane: hot air is sucked in underneath the clouds over the ocean, and pulled by the lower pressure into the eye, which draws the moisture up to the top of the hurricane and condenses.
1039676
Newtons second law - blance of momentum.\n\nWhen the force acting on the mass to accelerate it is the maximum that the engine, atmosphere, and gravitational attraction to the earth can produce, and those forces are balanced by the the forces acting on the mass to slow it down, then the mass is at its "max speed".\n\nDensity of the air is affected by altitude, temperature, humidity, and weather.  For horizontal, noncompressible flight, that density is a major component of the "dynamic pressure" and therefore the drag.\n\nA very simple model of drag is D=0.5*rho*U^2 *Cd*A where rho is the density of the working fluid (atmosphere), U is the freestream speed of the air, Cd is the coefficient of drag of the airplane, and A is the frontal cross-sectional Area.\n\nIf you set max thrust equals this drag, then you can math out what U is, and call it the max speed of the plane.  If the plane has a headwind or tailwind then its absolute speed will vary.\n\nIf the plane approaches mach then stranger and more energy-demanding phenomena kick in.  If the plan is going beyond the speed of sound there is a third, also complex description for the drag.\n\nIf you are using a prop driven plane then you cant just assume that the thrust equals the planes horsepower, you have to consider the efficiency of the prop and there are equations for that.\n\nDetermining the Cd for a plane is complex because the wing, body, and tail all interact to change the overall Cd.
1011792
By 'earthing' I assume you are referring to 'grounding' or disipating the electrical charge.  Planes have static wicks that help dissipate the static charge to the surrounding air.  They are located on the trailing (back) edge of the wings and control surfaces and are basically a plastic covered string.
791708
By flapping. Air molecules have substance. When you push down on them they push back up with an equal and opposite force (See Newton's Laws of Physics). So when the bird flaps its wings, it pushes down, air pushes and up and this creates lift. The shape of a birds wing also helps create lift. Because a bird's wing is curved on the top, air must travel faster along the top than the bottom to meet at the end. This creates a pressure difference above and below the wing creating lift.
179408
Bernoulli principle is only partially true for a airplane.\n \nThe main reason for airplane creating lift is when an airstream passes by something which deflects it downward. The force created by this deflection of the air creates an equal and opposite force upward on the wing according to Newton's third law of motion. The deflection of airflow downward during the creation of lift is known as downwash.\n\nA false explanation for lift is known as the "equal transit-time" explanation, it states that the parcels of air which are divided by an airfoil must rejoin again; because of the greater curvature (and hence longer path) of the upper surface of an aerofoil, the air going over the top must go faster in order to "catch up" with the air flowing around the bottom. Therefore, because of its higher speed the pressure of the air above the airfoil must be lower. Despite the fact that this "explanation" is probably the most common of all, it is false.