The Jet engines purpose is to create thrust.With out Thrust a plane would not be able to fly.
The purpose for jet aircraft is to quickly transport people to far away destinations or to fight in a war against the opponents.
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The purpose of a jet ski, is to ride around in circles until you get bored, and then take up room in the garage for years and years.
The purpose of an after burner in a jet is to provide an increase in push off that is usually for flights that are going to takeoff, and also during combat situations.
The first purpose-built jet airliner was the British de Havilland Comet which first flew in 1949 and entered service in 1952
The type of tool that a water jet cutter is can be considered an all purpose tool really. The water jet cutters use high pressure water jets to cut through just about anything.
The SU-35, also know as the "flanker" is a multi-purpose fighter jet, another jet is the SU-39 specialized for ground attacks.
There is no VIN number on a Sea-Doo Jet ski. There is a HIN number which serves the same purpose. Therefore you cannot decode it.
Jet trails, also known as contrails, are the visible lines of condensed water vapor left in the sky by aircraft engines. The purpose of jet trails is not intentional but rather a byproduct of the combustion of fuel in the aircraft engines at high altitudes where the air is cold and humid. The trails can persist and expand due to atmospheric conditions, leading to the formation of artificial clouds.
They really have no purpose . But mostly they are created by the jet exhaust freezing and creating ice crystals as the airliner flies in the stratosphere where temperatures are well blow freezing. Another similar point of view. Jet trails, or condensate trails, have no more purpose than the little cloud formed when you "see your breath" on a cold day. The same principles are involved.
The Jet Propulsion Laboratory at NASA is the lead for using robots to explore space. It is a federally funded and it is also responsible for operating NASA's Deep Space Network.