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Remote Pilot (Part 107) practice question 4

What effect does high density altitude have on the efficiency of a UA propeller?

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Correct answer: B. Propeller efficiency is decreased.

High density altitude means thinner air. The propeller has less air to work with, so it produces less thrust and propeller efficiency decreases.

References

Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), p. 4-4, Principles of Flight · search it in our library

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Question 4 from the FAA document Unmanned Aircraft General (UAG) Sample Questions (U.S. Government work, public domain) · ACS/LSC code UA.III.B.K1a. The FAA does not publish an answer key; the answer and explanation are ours, with references. Verify against the current regulations and handbooks.