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Which principle allows a glider pilot to find rising air?

  • A.Circling within a thermal to remain in the updraught
  • B.Flying at the speed at which the aircraft has the lowest possible sinking rate through the air around it
  • C.Flying in a straight line
  • D.Descending rapidly to a lower altitude where the air is warmer and therefore more likely to be rising

Answer: A

Thermals are narrow columns of rising air, so the pilot circles tightly to remain within the core, climbing whenever the updraught exceeds the sink rate of the aircraft. Minimum sink speed is used while circling and a faster speed between thermals. The technique is a direct practical application of convective boundary layer structure.

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