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The principle of aeroplane propulsion is to generate a propelling force by:
  • A
    pressurising air or gas in order to obtain a reaction force.
  • B
    generating a high velocity jet pushing against the outside air.
  • C
    heating up air in order to obtain a reaction force.
  • D
    accelerating air or gas in order to obtain a reaction force.
The jet engine produces thrust by accelerating a mass of air or gas. Newton’s 3rd law states that if we expel a mass of air rearwards, there will be an equal and opposite reaction forwards. To expel the gases, the gas turbine engine uses heat to produce thrust. It has the same working cycle as the piston engine (induction, compression, combustion, exhaust) but the process is continuous and entirely rotational. Therefore, the gas turbine engine runs more smoothly and has also the advantage of dealing with much larger amounts of energy for a given size and weight.
 

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