To move an airplane through the air, thrust is generated by some kind of propulsion system .
Most modern airliners use turbofan engines because of their high thrust and good fuel efficiency.
On this page, we will discuss some of the fundamentals of turbofan engines. A turbofan engine is the most modern variation of the basic gas turbine engine. As with other gas turbines, there is a core engine , whose parts and operation are discussed on a separate page. In the turbofan engine, the core engine is surrounded by a fan in the front and an additional turbine at the rear. The fan and fan turbine are composed of many blades, like the core compressor and core turbine, and are connected by an additional shaft.