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			== Propulsion ==
			<gallery>
			File:Armadillo_Aerospace_Pixel_Hover.jpg\|Armadillo Aerospace Pixel Hover
			File:Tupolev_Tu-95_in_flight.jpg\|Tupolev Tu-95 in flight
			File:Opel_Ampera_(front_quarter).jpg\|Opel Ampera (front quarter)
			File:Transrapid_09.jpg\|Transrapid 09
			File:Two_Main_Engines,_V12.jpg\|Two Main Engines, V12
			File:Shuttle_Main_Engine_Test_Firing.jpg\|Shuttle Main Engine Test Firing
			File:Beeinflightfromfront.jpg\|Propulsion
			</gallery>

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'''Propulsion''' is a term that refers to the action or process of pushing or pulling to drive an object forward. The term is derived from two Latin words: "pro", meaning before or forward; and "pellere", meaning to drive. A [[propulsion system]] is a machine that produces [[thrust]] to push an object forward. On an [[airplane]], the propulsion system is a group of parts which include the [[aircraft engine]] and the [[propeller]]. The propulsion system drives the airplane forward and the [[aerodynamics]] of the airplane allow it to lift into the air.

==Types of Propulsion Systems==
There are several types of propulsion systems, including [[internal combustion engine|internal combustion engines]], [[jet engine|jet engines]], [[rocket engine|rocket engines]], and [[electric propulsion|electric propulsion systems]]. Each type of propulsion system has its own advantages and disadvantages, and is used for different types of vehicles and in different environments.

===Internal Combustion Engines===
[[Internal combustion engine|Internal combustion engines]] are the most common type of propulsion system for ground vehicles like cars and trucks. They work by burning fuel in a combustion chamber, and the heat produced pushes a piston, which turns a crankshaft and drives the vehicle forward.

===Jet Engines===
[[Jet engine|Jet engines]] are used for most commercial and military aircraft. They work by sucking in air, compressing it, mixing it with fuel and igniting it. The resulting explosion pushes the aircraft forward.

===Rocket Engines===
[[Rocket engine|Rocket engines]] are used for spacecraft. They work by expelling propellant at high speed to push the spacecraft in the opposite direction, according to [[Newton's third law of motion|Newton's third law]].

===Electric Propulsion Systems===
[[Electric propulsion|Electric propulsion systems]] are used in some modern cars and trains. They work by using electricity to drive a motor, which turns the wheels of the vehicle.

==See Also==
* [[Engine]]
* [[Motor]]
* [[Thrust]]
* [[Aerodynamics]]

[[Category:Propulsion]]
[[Category:Physics]]
[[Category:Engineering]]
[[Category:Transport]]

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Propulsion - Revision history

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