What does "airborne" do  exactly?
401057
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1096669
The technique is called LAPES -- Low Altitude Parachute Extraction System -- and is still used (though infrequently) by the U.S. Army Airborne.  It is useful for delivering large loads to a contested landing strip.\n\nThere's a terrific video out on the web that shows the misadventures of some airborne and :APES drops.  If you can find it, it is worth if for the laughs, especially the shot of the cargo vehicle that breaks free from its skid and goes free-wheeling off into the sunset!
54343
Try wikipedia next time:\n\nThrust vectoring is the ability of an aircraft or other vehicle to direct the thrust from its main engine(s) in a direction other than parallel to the vehicle's longitudinal axis. The technique was originally envisaged to provide upward vertical thrust as a means to give aircraft VTOL or STOL capability. Subsequently it was realised that the use of vectored thrust in combat situations enabled an aircraft to perform various maneuvers not available to conventional-engined planes.
59236
Aircraft are able to climb and maintain altitude by utilizing a combination of the Bernoulli effect and simple momentum transfer in the air flow to generate lift. Lift is generated primarily by the wing of the aircraft. \n\nTo generate lift using the Bernoulli effect, the cross-section of the wing is shaped in such a way that the distance from the leading edge to the trailing edge is greater along a path that runs over the wing than under the wing. As the aircraft is propelled forward, air necessarily flows both over and under the wing. Because of the greater distance that air must travel over the wing, the air pressure over the wing is less than the air pressure under the wing. This difference in pressure between the top and bottom of the wing results in a net upward force, or lift, on the wing. This is the Bernoulli effect. \n\nOne way of understanding the physical basis of the Bernoulli effect is to consider that, since the path of the air flow over the wing is longer, the air over the wing is forced to expand into a greater volume than that flowing under the wing. Consequently, the air pressure over the wing is necessarily lower than that under the wing. \n\nLift can also be generated by dynamic momentum transfer from the airstream. In this method, the tilt, or angle of attack, of the wing relative to the overall direction of motion causes the flow of air striking the under surface of the wing to be turned, or deflected, downward. That is, a downward momentum is imparted to the airflow by the deflection induced by the wing. Newton's law dictates that a compensating reaction force (lift) acts in the upward direction on the wing according to F = dp/dt, where p is the momentum (F and p are vectors). This is the same principle that generates sufficient upward force on water skis to keep a skier from sinking below the surface. \n\nIn practice, the aerodynamics of flight are complicated by many other effects. Obviously, opposing the upward lift is the downward force of gravity. Likewise, opposing the forward thrust of the aircraft is the backward force of drag created by resistance to passage through the air. Also, both the Bernoulli and momentum transfer effects depend upon the smooth, or laminar (streamline), flow of air around the wing. Various factors can induce turbulence in the air flow that (generally) spoils lift, increases drag and decreases the overall efficiency of the aircraft in flight. \n\nFor more details, see the web site: \n\nhttp://www.aviation-history.com/theory/index-theory.html
57134
The answer has to do with Aerodynamics.  Whenever you have a object in motion it creates a vacuum behind it.  It pushes the air in front of it which creates a high pressure system and a lower pressure system behind the object.  Basically a vacuum.  You can see this phenomon demonstrated in a stream where there is a rock.  Behind the rock you get an eddie or a low pressure system.  The lower pressure system is created by the law that states whenever there is moving system it creates a low pressure system on the verge of it.  This is what keeps a airplane up since the air passing over the wings is faster then the air passing under the wings since the top is bowed.  You can also see this phenomon demonstrated when you use a paint sprayer that is hooked up to pressurized air.  The air flowing over the nozzle draws the paint into tube.  So what does this mean to the motorcycle?  It means that you are being litterally sucked into the vacuum produced by the back of the 18 wheeler.
702620
Applications huh?  Here's a practical aircraft application.\n\nWell I worked on aircrafts before and our shock struts ( like shock absorbers) are filled with nitrogen.  Depending on the weight of the aircraft the volume may decrease or increase (therefore rising or lowering the aircraft)  So we can ensure that we have enough nitro in there we have a gauge that tells us the pressure.  We compare that pressure to the height of the strut (which gives us the volume) and check our chart (which utilizes boyles law) to ensure or pressure is appropriate for the volume.
1100560
Antigravity on earth at least = negative G’s.  you can achieve this by jumping a dirt bike or even your car (not recommended).  \n\nThere is even a flight called the Vomit Comet.  NASA operates a KC-135 craft outfitted to perform parabolic arcs that give weightlessness or more properly freefall lasting 20-25 seconds. The plane is nicknamed "The Vomit Comet" because of the large number of researchers that become ill. Imagine a roller coaster thousands of feet high. Imagine going up and down that roller coaster repeatedly for a coupole of hours. Now you know why so many people get sick!
258592
Both above answers are correct. Additonally, it cost alot more to do it in the air. You have to spend a lot of fuel getting that tanker plane up to altitude and to where it needs to be. Not to mention pay for the pilots and ground crew support for the tanker plane, storage etc. In contrast You one low pay grade person can drive a tanker truck and fuel planes on the ground.
243394
Vapor trails are a function of flight altitude and weather conditions.  Vapor trails have nothing to do with type of aircraft - does not even have to be a jet. A bit of trivia -during WWII weather forecasters were relied upon to predict altitudes at which vapor trails would occur so our bombers could avoid those altitudes as they approached their targets.  This was essential information since enemy anti aircraft guns could track the flight of high flying aircraft if they flew at vapor trail producing altitudes.
481466
they are a rapid response group,supposed to be able to strick any where in the world in 24 hours. but i dont know anything about them since they are in the movies only.\nformed from the 82nd airborne stationed at ft bragg,now select ones come from all branches now to form the crew,and it has been awhile since i had anything to do with them,but i have a nephew still in,i just cant remember where he is though :0)
266829
Airborne is an elite unit of the army and many candidates wash out for many reasons.  This does not make them undesirable to the regular army.  He may be asked to rejoin his original unit, or he may be re-assigned to another unit. Do not despair, at least he tried, that shows that he has heart and that is a good thing.
57021
A glider (or sail plane) is towed aloft by a small engined plane and released within or near a thermal or updraft.  The air is moving upwards where moisture will condense and form or grow a cloud.  The glider can circle beneath the cloud while gaining altitude and moves about as fast as a slow moving car.\n\nWhen the soaring flight is over the wings are trimmed and the speed will depend on how far down the nose is pointed.  (Straight down would reach terminal velocity limited only by wind resistance and may destroy the glider.)  The licensed pilot has great control of the speed and can set it down almost at a running speed.  Elmira, NY is the Soaring Capital of the world and you can take a flight there for very little money.  Great fun.
657369
gospieler was correct!\nGliders were the ORIGINAL STEALTH FLYERS.\nNo engines....therefore no noise....whatsoever!\nThey would fly in and out...no sound.\nThey did not require a run, they could land on just about any wide patch of land.\nA silent aggressor floating on air.\nJust like a large paper airplane.\nI've actually meet a WWII glider pilot.\nYou talkin' about brave!\nThese guys were incredibly brave!
667234
I will be damned if I know, lol, but, I am about to- but hope to never need to use one:)\n\nParachutes work because of something called ‘air resistance.’ If there were no air resistance, then gravity would cause everything to fall at the same rate, so no matter what item you dropped (i.e. a feather or a rock), it would hit the ground at exactly the same time (assuming you dropped it from the same height). But air resistance complicates things (and makes sky-diving a lot more fun). Air resistance happens because as things fall, they have to push their way past the atoms and molecules that make up air in order to get where they’re going.\n\nFor something like a rock, this isn’t really a big deal, since rocks tend to be really heavy while being pretty small, so they can push the air molecules out of the way quite easily. But things like feathers can’t push the air molecules out of the way very well – for one, they weigh less so they don’t push as hard. And for another, they’re pretty big, so they run into a lot more air molecules than the rock does. So the air actually slows the feather down.\n\nThis is what makes parachute work. If a person were to fall without a parachute, they’d push the air molecules out of the way very easily, so the air wouldn’t be able to do much to slow the person down. But if the person is attached to a parachute, then the parachute will run into lots of air molecules, and especially if it’s curved to be higher up in the middle, it will be very hard for the air molecules to get out of the way. If they can’t get out of the way, they will slow the parachute (and hence the person) down. \n\nAnother way to put it:)\n\n    *  A parachute works to slow down someone or something from falling by creating “drag”.\n    * Drag is the push on something from air or water.\n    * Because air is much thinner than water it doesn’t have as much drag.\n    * The bigger something is – the larger it’s surface area the more drag it creates.\n    * That’s why a parachute works so well – it’s very light and it has a very big surface area. It catches lots of air in it as it falls so it creates lots of drag which slows it down as it falls. \n\nHope you are happy now, I am still NOT jumping out of an airplane, lol
1031881
As an aircraft moves through the air, the wing is inclined to the flight direction at some angle. The angle between the chord line of the airfoil and the flight direction is called the angle of attack. Angle of attack has a large effect on the lift generated by a wing. During takes off, the pilot applies as much thrust as possible to make the airplane roll along launch rail. But just before lifting off, the pilot "rotates" the aircraft. The nose of the airplane rises, increasing the angle of attack and producing the increased lift needed for takeoff.\n\nThe amount of lift generated by a wing depends on how much the flow is turned, which depends on the shape of the object. The lift is, in general, a very complex function of the shape.the greater the air flow turning, the greater the lift.\nIt is important to note that the acceleration of the air does not just involve the air molecules "bouncing off" the lower surface of the wing. Rather, air molecules closely follow both the top and bottom surfaces, and so the airflow is deflected downward. The acceleration of the air during the creation of lift has also been described as a "turning" of the airflow.\nWhen the air is bent around the top of the wing, it pulls on the air above it accelerating that air down, otherwise there would be voids in the air left above the wing. Air is pulled from above to prevent voids. This pulling causes the pressure to become lower above the wing. It is the acceleration of the air above the wing in the downward direction that gives lift.\n\n\nThe amount of lift generated by an object depends on the size of the object. Lift is an aerodynamic force and therefore depends on the pressure variation of the air around the body as it moves through the air. The total aerodynamic force is equal to the pressure times the surface area around the body. Lift is the component of this force perpendicular to the flight direction. Like the other aerodynamic force, drag, the lift is directly proportional to the area of the object. Doubling the area doubles the lift.\n\n\nThe greater the angle of attack, the greater the vertical velocity. Likewise, for the same angle of attack, the greater the speed of the wing the greater the vertical velocity. Both the increase in the speed and the increase of the angle of attack increase the length of the vertical arrow. It is this vertical velocity that gives the wing lift.
213043
I think it is a measurement device for flow (either measuring air or using pneumatic pressure). Some information on transmitters....
395913
There are pilots on the ground.  They fly by remote control.  Read more about it below.\n\nVery, very few can fly without some human intervention.