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 How a Jet Engine Works

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Come explore the answers to these and other curiosities you may have!

 Try this experiment!



What You Need

A garden hose attached to outside faucet
garden hose nozzle; (if unsure, ask your parents for the kind that you turn to make a water stream or spray)
toy with wheels, a skateboard is good!

Firmly attach the hose with the end with the garden hose nozzle to the toy (skateboard) using the tape.

With the nozzle adjusted to have the water come out in a fast stream, place the skateboard on the sidewalk.

Turn on the water at the faucet to full open!

What happened?


Your made your own ground running water jet engine.

What is engine thrust?


Engine thrust is a forward moving force that is created when gases made of air and burnt fuel are accelerated out the back or exhaust end of a jet engine.

The act of taking a liquid (air is a liquid) and speeding it up faster and faster (that is accelerating it) creates thrust. A jet engineer will tell you that jet power is measure in terms of " pounds of thrust". The amount of thrust (or Force) is equal to the amount of air (usually measured in pounds of air) going into the engine, multiplied by the change in the speed of the air as it passes through the engine. [ >> ?'s]


In math this means Force = Mass x Acceleration (see Newton's second law)


How does a jet engine make thrust?

Thrust has two ingrediants: air (lots of it!) and accelerating that air to super high speeds.


A jet engine works by...

 Force (Thrust) = Mass air(weight) times Acceleration air


Air is sucked into the front of the engine and then is squeezed and squeezed until the large amount of air is compressed into a small area. This compressed air next moves into a part of the engine where the compressed air (with lots of oxygen) is mixed with fuel and burned into a exploding fire ball of hot gasses. This is the bang! This very fast moving (accelerated) stream of jet gasses then blows out of the engine as exhaust gas. [ >> ?'s]



 How planes fly


 How jet engines work


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