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What is the use of the headwind?

What is the use of the headwind? Correct Answer To change the datum height

The headwind is used to change the datum speed of the take-off. This headwind effects the ground run speed. For every 10% change in headwind, there is 20% decrease in the ground run distance.

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The headwind only effects in the kinematic energy in the case of the airborne distance.
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