What is the imaginary line about which the rotor rotates, perpendicular to the tip-path plane?

Study for the FAA Helicopter Flying Test. Utilize flashcards and multiple-choice questions, with each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

What is the imaginary line about which the rotor rotates, perpendicular to the tip-path plane?

Explanation:
The rotor turns about an imaginary line known as the axis of rotation—the rotor shaft running through the hub. This line is perpendicular to the plane in which the blade tips move, called the tip-path plane. As the rotor spins, every point on the blade traces a circular path in that plane, centered on the axis. So the axis of rotation is the line about which the rotor rotates. The other terms refer to weight, blade bending from centrifugal forces, or a damping mechanism, none of which define the rotation line.

The rotor turns about an imaginary line known as the axis of rotation—the rotor shaft running through the hub. This line is perpendicular to the plane in which the blade tips move, called the tip-path plane. As the rotor spins, every point on the blade traces a circular path in that plane, centered on the axis. So the axis of rotation is the line about which the rotor rotates. The other terms refer to weight, blade bending from centrifugal forces, or a damping mechanism, none of which define the rotation line.

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