Engine 

There are many different engines for different planes. Most airlines have a turbofan engine in their planes but, aircraft like jets use a turbojet engine. Turbofan engines have a big fan in the front which sucks some of the air into the engine but, most of the air goes around the outside of the core of the engine. When the air goes outside and around the core, it makes the plane quieter and gives it more thrust when it is going at a low speed. In turbojet engines all the air that goes into the engine passes through a gas generator. The generator is made of a combustion chamber, turbine, and a compressor. In a turbofan engine the portion of air that goes into the engine goes into a combustion chamber while the rest goes through a fan and then released as a “cold jet.” It is called “cold jet” because it is the air that went around the core and was not mixed with the gas generator exhaust. The air that mixed with the exhaust is called “hot jet”. This system is supposed to increase thrust without using too much fuel, it works by increasing the airmass flow while reducing the velocity within the total energy supply. Sure, engines produce the thrust to make planes fly but, do you know what makes the plane lift? 

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                                Turbo Fan                                                                                                          Turbo Jet

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