FAA Part 107 Remote Pilot (UAG)OperationsEasy
A remote pilot is preparing for a commercial sUAS operation in a remote area. During the preflight inspection, the pilot notices that the sUAS's propellers are slightly unbalanced. What is the most likely consequence of operating the sUAS with unbalanced propellers?
- ADifficulty maintaining a stable hover in calm wind conditions.
- BIncreased vibration, leading to potential component failure and unstable flight.
- CReduced maximum altitude capability due to inefficient thrust.
- DDecreased battery life and reduced flight duration.
Show answer & explanationAnswer & explanation
Correct answer: B. Increased vibration, leading to potential component failure and unstable flight.
Unbalanced propellers cause excessive vibration during flight. This vibration can lead to premature wear or failure of components like motors, bearings, and the airframe, and can also make the sUAS unstable.
Why the other options are wrong
- A. While it might contribute, severe vibration is a more significant and immediate consequence than just difficulty in hovering.
- C. Reduced maximum altitude is more related to overall thrust efficiency, not primarily propeller balance issues.
- D. While possible, reduced battery life is a less direct and less critical primary consequence compared to mechanical failure or instability.
Unbalanced Propellers
Propellers that do not have their mass evenly distributed, leading to excessive vibration during rotation.
- Causes increased vibration.
- Can lead to premature wear and failure of sUAS components.
- Impairs flight stability and control.
Memory trick: Balanced blades bring stable flights, unbalanced blades bring bad vibrations.