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Sport Pilot Airplane practice question 10
What is ground effect?
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Correct answer: A. The result of the interference of the surface of the Earth with the airflow patterns about an aircraft.
Ground effect is the interference of the surface with the airflow around a wing within about one wingspan of the ground. It reduces upwash, downwash and wingtip vortices, and with them induced drag.
References
- Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 5-11, Aerodynamics of Flight · search it in our library
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Question 10 from the FAA document Sport Pilot Airplane (SPA) Sample Questions (U.S. Government work, public domain) · ACS/LSC code PLT131. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.