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How far will an aircraft travel in still air if it begins gliding from 5000 feet above the ground with a lift-to-drag ratio of 10:1?

  • A

    7.40 NM

  • B

    8.23 NM

  • C

    9.47 NM

  • D

    15.24 NM

With a L/D ratio of 10, the aircraft will glide a distance of 10 miles for each mile of altitude lost in still air.

(1) Determine the aircraft’s height in NM: 1 NM = 6080 ft
The aircraft is flying at an altitude of 5000 / 6080 = 0.822 NM

(2) Calculate the gliding range in still air (NAM):
Gliding range in still air (NAM) = 10 x 0.82 = 8.22 NM

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