Dissymmetry of Lift - Knowledge Check

Question 1 of 5

1. Question

Fill in the blanks.

The blade tips move at 400 kts, and the helicopter is flying at 100 kts. The advancing half has a relative airspeed of Fill in the blank 1 of 2 kts, and the retreating half has a relative airspeed of Fill in the blank 2 of 2 kts.

Question 2 of 5

2. Question

What solves the problem of dissymmetry of lift?

Blade twist

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Blade flapping

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Increasing rotor RPM

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The tail rotor

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Question 3 of 5

3. Question

Match each part of the rotor disk to what happens there in forward flight.

Sort elements

Higher relative airspeed
Lower relative airspeed
Flaps up against induced flow; angle of attack decreases
Flaps down with induced flow; angle of attack increases

Advancing half

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Retreating half

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Advancing blade

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Retreating blade

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Question 4 of 5

4. Question

Which of the following situations create dissymmetry of lift? (Select all that apply.)

Forward motion of the helicopter in still air

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Wind blowing during a zero ground speed hover

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The helicopter and the air both moving relative to each other

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A zero ground speed hover in still air

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Question 5 of 5

5. Question

You're holding a zero-groundspeed hover with a steady 20-knot wind coming from your right. Is the rotor experiencing dissymmetry of lift?

Yes; the wind creates advancing and retreating halves of the disk

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No, because the helicopter's groundspeed is zero

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No, because the wind is from the side rather than the front

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Only if the pilot moves the cyclic

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Dissymmetry of Lift - Knowledge Check

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