Transverse Flow Effect - Knowledge Check

Question 1 of 5

1. Question

You're holding a stationary hover, with zero groundspeed, into a steady 20-knot headwind. You feel a lateral vibration and the helicopter tries to roll right. What is the most likely cause?

Transverse flow effect

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A mechanical problem with the rotor system

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Ground resonance

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Translating tendency

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Question 2 of 5

2. Question

Fill in the blanks.

The fore-and-aft lift imbalance is greatest around Fill in the blank 1 of 2 knots, and it is corrected with a small amount of Fill in the blank 2 of 2 cyclic.

Question 3 of 5

3. Question

Which statements about transverse flow effect are correct? (Select all that apply.)

It is airspeed-relative, not groundspeed-relative

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It is felt on every normal takeoff and landing

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It is a mechanical vibration

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It reappears briefly when decelerating back below ETL on approach

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Question 4 of 5

4. Question

Match each term to its description.

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A gradual efficiency gain that begins with the first knot of relative wind
The threshold at 16–24 knots where the entire disk works in undisturbed air
An airflow asymmetry felt as vibration and a right rolling tendency

Translational lift

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Effective translational lift

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Transverse flow effect

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Question 5 of 5

5. Question

Put the events of a normal takeoff in the order they occur.

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Transverse Flow Effect - Knowledge Check

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