Ground Effect - Knowledge Check

Question 1 of 5

1. Question

What are the two main sources of the efficiency gain from ground effect? (Select all that apply.)

A reduction in induced flow across the disk

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A reduction in the size of wingtip vortices

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An increase in air density near the ground

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An increase in rotor RPM

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Question 2 of 5

2. Question

Fill in the blanks.

Ground effect usually extends to about one rotor diameter: roughly Fill in the blank 1 of 2 feet for the R22 and Fill in the blank 2 of 2 feet for the R44.

Question 3 of 5

3. Question

Match each surface to the way it degrades ground effect.

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Absorbs (swallows) the downwash instead of reflecting it
Traps the outflow and returns it to the rotor (recirculation)
Scatters the outflow into eddies instead of a clean sheet
Lets the outflow spill off in every direction

Tall grass, crops or brush

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Confined area surrounded by walls or trees

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Rough terrain or a boulder field

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Small elevated pad or pinnacle

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Question 4 of 5

4. Question

Before departing downwind from a sheltered spot, you do a hover power check at 3 feet facing into a 15-knot wind. The margin looks comfortable. What is the problem with relying on it?

The check includes translational lift from the wind, so it overstates the margin you'll have downwind or in the shelter

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Ground effect doesn't exist when there's wind

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Hover checks are only valid in no wind

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There's no problem; the check shows your true margin

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Question 5 of 5

5. Question

Which performance chart should a pilot use to plan photo flights, longline, or pinnacle work?

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Ground Effect - Knowledge Check

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