POF Q3 - Aerodynamic Force & Aerofoil Pressure Distribution

Question 1

The point of highest static pressure on an aerofoil is found where?

a.The trailing edge

b.The free stream airflow

c.The lowest surface of the aerofoil

d.The stagnation point

Answer 1

d.The stagnation point

Question 2

In 2D flow, the angle of attack is most accurately described as?

a.The angle between the chord line and the air.

b.The angle between the wing and the relative air flow.

c.The angle between the chord line and the relative airflow

d.The angle between the mean camber line and the relative airflow

Answer 2

c.The angle between the chord line and the relative airflow

Question 3

Name the parts of the Aerofoil profile!

Answer 3

leading edge (right)

leading edge radius (right circle)

point of max thickness (height)

trailing edge (left)

Question 4

The total reaction force originates from the centre of gravity.

Select one:
True
False

Answer 4

False

The total reaction of forces originates from the Centre of Pressure (CP).

Question 5

As Angle of Attack (𝛼 increases, the velocity of flow over the upper surface increases.

Select one:
True
False

Answer 5

True

Question 6

Which of the following statements best describes the coefficient of force?

a.It is a shortened version of the dynamic pressure equation.

b.It is the natural ability to create force

c.It is a measurement of the total force being produced by the wing.

d.It is the ratio between how much lift is being produced vs how much drag is being produced.

Answer 6

b.It is the natural ability to create force

Question 7

In 2D flow, which statement is correct?

a.Lift acts perpendicular to the weight force, and drag acts parallel to the free stream flow.

b.Lift acts parallel to the free stream flow, and drag acts perpendicular to the free stream flow.

c.Lift acts perpendicular to the free stream flow, and drag acts parallel to the free stream flow.

d.Lift and drag act perpendicular to the weight force.

Answer 7

c.Lift acts perpendicular to the free stream flow, and drag acts parallel to the free stream flow.

Question 8

The sum of aerodynamic force can be said to act through which singular point?

a.The centre of lift.

b.The centre of pressure.

c.The centre of gravity.

d.The centre of mass.

Answer 8

b.The centre of pressure.

Question 9

At which point on the aerofoil will you find the lowest flow speed?

a.The underside of the aerofoil

b.The free stream airflow.

c.The trailing edge

d.The stagnation point

Answer 9

d.The stagnation point

Question 10

The line of equal distance between the upper and lower aerofoil surface is known as the…

a.The finenss ratio

b.The mean aerodynamic chord

c.The mean camber line

d.The camber line

Answer 10

c.The mean camber line