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ATPL POF > Wing Design > Flashcards

Wing Design Flashcards

1
Q

How does aspect ratio affect the pressure gradient

A

Higher aspect ratio = smaller pressure gradient

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2
Q

What affect does a higher aspect ratio have on landing characteristics

A

More chance of tip sticks

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3
Q

How does vortices affect Cl

A

Bigger the vortices the smaller the Cl

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4
Q

What can you do to a sweepback / highly tapered wing to prevent the tip stalling first in a

A

Washout

Change camber / thickness

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5
Q

What affect does a High wing load have on the induced drag

A

High wing load

More cl
Increased pressure differential
Bigger vortices
More induced drag

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6
Q

What are the 3 components of parasite drag

A

Form (pressure difference due to stagnation points)

Skin friction drag = friction between airflow and skin = boundary layer

Interference drag

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7
Q

What is the relationship between parasite drag and v^2

A

Parasite drag is proportional to v^2

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8
Q

What is the relationship between induced drag and v^2

A

Induced drag is inversely proportional to v^2

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9
Q

How do you reduce form drag

A

Streamline

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10
Q

When is skin friction greater

A

Rough skin caused by ice/ water / dirt / age

Colder air

Speed

Surface area

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11
Q

How do you reduce interference drag

A

Fillets (non structural fairings) to smooth out joints

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12
Q

What causes more parasite drag

A

“Dirty” aircraft

Landing gear
Flaps
Spoilers

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13
Q

How does AOA affect parasite drag

A

It doesn’t unless at very high AOA

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14
Q

What happens to cl when you double the airspeed

A

1/4 of original value

cause v^2 = 4x

Therefor cl needs to be divided by 4 to maintain the L

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15
Q

What happens to Cdi when you double airspeed

A

1/16th

Because Cdi is proportional to Cl^2

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16
Q

What happens to Di when speed is doubled

A

1/4 because Di is proportional to 1/v^2

17
Q

What is the formula for Di to aspect ratio

A

Di is proportional to 1/ aspect ratio

18
Q

What is the formula for Cdi and aspect ratio

A

Cdi is proportional to Cl^2/aspect ratio

19
Q

How can u reduce induced drag

A

Modify wingtips makes it more difficult for adverse pressure gradient to push air round wing tip

20
Q

How is induced drag created

A

Downwash and vortices

21
Q

When do you spend the most time in the “unstable” zone

A

Landing

22
Q

How does altitude affect the total drag curve if the x-axis plots TAS

A

More to the right

23
Q

How does increased mass affect the drag curve

A

Up and to the right

24
Q

How does being in a “dirty” configuration affect the drag curve

A

Up and to the left

25
Q

What is the mean geometric chord of a wing

A

Wing area divided by the wing span

ATPL POF (12 decks)

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