AerodynamicsQuestion 485 of 934

Why are propeller blades twisted?

  1. The blade tip moves faster than the hub
  2. The twist makes the propeller quieter
  3. The hub moves faster than the blade tip
  4. The twist lowers the engine rpm at cruise
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Correct answer: The blade tip moves faster than the hub

The twist changes the blade angle along the blade so the AOA stays nearly constant in cruising flight.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 5: Aerodynamics of Flight — Basic Propeller Principles, page 127

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Questions last reviewed: 18 October 2026