General Physical Principles
All jet engines are reaction engines that generate thrust by emitting a jet of fluid rearwards at relatively high speed. The forces on the inside of the engine needed to create this jet give a strong thrust on the engine which pushes the craft forwards.
Jet engines make their jet from propellant from tankage that is attached to the engine (as in a 'rocket') as well as in duct engines (those commonly used on aircraft) by ingesting an external fluid (very typically air) and expelling it at higher speed.
Read more about this topic: Jet Engine
Famous quotes containing the words general, physical and/or principles:
“Under an able general there are no weak troops.”
—Chinese proverb.
“Public Opinion ... an attempt to organise the ignorance of the community, and to elevate it to the dignity of physical force.”
—Oscar Wilde (1854–1900)
“Struggle is the father of all things.... It is not by the principles of humanity that man lives or is able to preserve himself above the animal world, but solely by means of the most brutal struggle.”
—Adolf Hitler (1889–1945)