Aeroplanlære - Kap 3 (Lift) Flashcards

1
Q

What is lift perpendicular too?

A

The relative airflow

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2
Q

What is airflow parallel too?

A

Drag

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3
Q

What is the aerodynamic force equation?

A
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4
Q

What increases with angle of attack?

A

Coefficient of lift

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5
Q

What is the lift equation?

A
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6
Q

What is the coefficient of lift?

A
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7
Q

Which factors affect coefficient of lift?

A

Angle of attack
Thickness
Camber

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8
Q

What increases linear with the pressure differential?

A

The coefficient of lift

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9
Q

What is the maximum of coefficient of lift for a particular aerofoil?

A
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10
Q

What is another word for the stalling angle?

A

Critical angle of attack

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11
Q

What happens when the thickness of an aerofoil increases?

A

The stalling angle of attack increase
The rate which CL increase is approximately the same
CLmax increases

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12
Q

What is the difference between a cambered aerofoil and a symmetrical when it comes to the coefficient of lift?

A

The coefficient of lift is higher on a cambered but stall angle is the same

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13
Q

What is the effect of a trailing edge flap on lift and stall angle?

A

It increases camber and thereby increase lift but also reduce stalling angle

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14
Q

Two identical aircraft but one is twice as heavy. Extra lift is needed and how do we do this?

A

Flying faster - 1.414 times faster
Increasing the coefficient of lift (CL)

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15
Q

When flying level which two forces are equal?

A

Weight (Gravity) and lift

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16
Q

When decreasing speed what must then be done to keep level flight?

A

Raise nose

17
Q

What type of wings does a fighter jet have in order to fly level at high speeds?

A

Thin and less cambered wing to reduce the coefficient of lift (CL)

18
Q

What is the different variables in the equation for lift measured in?

A

V is in m/s^2
S is in m^2
Air density is in kg/m^3
The answer will be in newtons

19
Q

When does ground effect occur?

A
20
Q

What is reduced in the ground effect?

A

Drag
Angle of attack

21
Q

What is on the y axis?

A

Drag

22
Q

What should you be cautious of in the ground effect when it comes to angle of attack?

A

The stalling angle is less so you will stall at a lower angle

23
Q

When entering ground effect what can you expect?

A
24
Q

When leaving ground effect what can you expect?

A