Coriolis Force & Conservation of Angular Momentum - Knowledge Check

Question 1 of 5

1. Question

When a rotor blade flaps or cones upward, what happens to its center of mass and rotational speed?

Its mass moves farther from the axis, and the blade slows down

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Its mass moves closer to the axis, and the blade accelerates

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Its mass stays at the same distance, and speed is unchanged

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Its mass moves closer to the axis, and the blade slows down

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Question 2 of 5

2. Question

Fill in the blanks.

When a blade flaps up, it accelerates in its plane of rotation and Fill in the blank 1 of 2 . When a blade flaps down, it decelerates and Fill in the blank 2 of 2 .

Question 3 of 5

3. Question

Match each rotor system to how it handles Coriolis forces.

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Composite blades bend and flex to absorb the forces
Lead-lag (drag) hinges with hydraulic or elastomeric dampers
Undersling keeps the blade's center of mass at nearly the same distance from the axis

Rigid

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Fully articulated

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Robinson semi-rigid teetering

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Question 4 of 5

4. Question

What does the Robinson teetering rotor system gain? (Select all that apply.)

Mechanical simplicity

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Low maintenance

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Immunity to classic ground resonance

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Immunity to low-G mast bumping

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Question 5 of 5

5. Question

What is the name of the divergent oscillation in articulated rotor systems, often triggered by a hard one-skid touchdown, that can destroy a helicopter in seconds?

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Coriolis Force & Conservation of Angular Momentum - Knowledge Check

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