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Take a 75-300 ton plane, planes need to take off by running on a runway because to take off the plane needs preasure under it's wing so that the preasure can lift the plane up in the sky.

The runway has to be atleast 2KM long so that the plane has time to reach it's appropriate speed to take off. people have tried and tried but always failed trying to make a 70-300 ton plane fly just by using a (underbody thruster engine), only one plane succeeded the the or project and that plane was the "harier."

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Q: Why must the aeroplane run on the runway before taking off?
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