Air jet spinning machine
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An aircraft is a machine that is able to fly by gaining support from the air . It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil ,  or in a few cases the downward thrust from jet engines . Common examples of aircraft include airplanes , helicopters , airships (including blimps ), gliders , and hot air balloons . 
The human activity that surrounds aircraft is called aviation . Crewed aircraft are flown by an onboard pilot , but unmanned aerial vehicles may be remotely controlled or self-controlled by onboard computers. Aircraft may be classified by different criteria, such as lift type, aircraft propulsion , usage and others.
Flying model craft and stories of manned flight go back many centuries, however the first manned ascent – and safe descent – in modern times took place by larger hot-air balloons developed in the 18th century. Each of the two World Wars led to great technical advances. Consequently, the history of aircraft can be divided into five eras:
The jet engine is the power plant of today's jet aircraft, producing not only the thrust that propels the aircraft but also the power that fuels many of the aircraft's other systems.
Jet engines operate according to Newton's third law of motion, which states that every force acting on a body produces an equal and opposite force. The jet engine works by drawing in some of the air through which the aircraft is moving, compressing it, combining it with fuel and heating it, and finally ejecting the ensuing gas with such force that the plane is propelled forward. The power produced by such engines is expressed in terms of pounds of thrust, a term that refers to the number of pounds the engine can move.
Today's commercial engines, up to eleven feet in diameter and twelve feet long, can weigh more than 10,000 pounds and produce more than 100,000 pounds of thrust.
JPL is the leading U.S. center for robotic exploration of the solar system, and has 19 spacecraft and 10 major instruments carrying out planetary, Earth science and space-based astronomy missions.
Spinning is the twisting together of drawn-out strands of fibers to form yarn , and is a major part of the textile industry . The yarn is then used to create textiles , which are then used to make clothing and many other products. There are several industrial processes available to spin yarn, as well as hand-spinning techniques where the fiber is drawn out, twisted, and wound onto a bobbin .
Artificial fibres are made by extruding a polymer through a spinneret into a medium where it hardens. Wet spinning ( rayon ) uses a coagulating medium. In dry spinning ( acetate and triacetate), the polymer is contained in a solvent that evaporates in the heated exit chamber. In melt spinning ( nylons and polyesters ) the extruded polymer is cooled in gas or air and sets.  All these fibres will be of great length, often kilometers long.
Natural fibres are from animals ( sheep , goat , rabbit , silkworm ), minerals ( asbestos ), or plants ( cotton , flax , sisal ). These vegetable fibres can come from the seed ( cotton ), the stem (known as bast fibres: flax , hemp , jute ) or the leaf ( sisal ).  Without exception, many processes are needed before a clean even staple is obtained. With the exception of silk, each of these fibres is short, being only centimetres in length, and each has a rough surface that enables it to bond with similar staples. 
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