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AerodynamicsQuestion 490 of 934

Where does the force from gyroscopic precession act on a spinning propeller?

  1. At the point of application itself
  2. 90° ahead, in the direction of rotation
  3. 90° behind, against the direction of rotation
  4. 180° across the propeller disc
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Correct answer: 90° ahead, in the direction of rotation

Precession is the deflection of a spinning rotor. The force takes effect 90° ahead in the direction of rotation.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 5: Aerodynamics of Flight — Torque and P-Factor — Gyroscopic Action, page 128

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Questions last reviewed: 18 October 2026