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43 - FAA Part 107 Drone Exam Prep - In weight and balance terminology, what is an 'arm'?

Question 43 - Loading and performance - FAA Part 107 Drone Exam Prep

The structural boom holding the motor.
The horizontal distance in inches from the reference datum line to the center of gravity of an item.
The total lifting force of one propeller.

Training tests and timed exam simulations FAA Part 107 Drone Exam Prep