Jet propulsion is defined as �thrust imparting forward motion to an object, as a reaction to the rearward expulsion of a high-velocity liquid or gaseous stream.� Jet power as a form of propulsion has been known for hundreds of years although its use for propelling vehicles that carry loads is considered a recent technology. : �The earliest known reaction engine was an experimental, steam-operated device that was developed about the 3rd century BC by the Greek mathematician and scientist Hero of Alexandria. Known as the aeolipile, Hero's device did no practical work, although it demonstrated that a jet of steam escaping to the rear drives its generator forward. The aeolipile consisted of a spherical chamber into which steam was fed through hollow supports. The steam was allowed to escape from two bent tubes on opposite sides of the sphere, and the reaction to the force of the escaping steam caused the sphere to rotate. () The development of the steam turbine in 1629 is credited to the Italian engineer Giovanni Branca, who directed a steam jet against a turbine wheel, which in turn p......

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