FaA Quiz - Drag and Glide Ratio

Skin Friction drag:

• Is caused by the shape of a body.

• Is generated due to shear stresses acting on the body surface.

• Is caused by junctions (e.g. between the wing and fuselage).

• Depends on the lift of the wing.

Induced drag:

• Is caused by shockwaves.

• Is caused by junctions (e.g. between the wing and fuselage).

• Depends on the lift of the wing.

• Is generated due to shear stresses acting on the body surface.

Induced drag is a type of:

• Pressure drag

• Friction drag

• Parasite drag

• Wave drag

Form drag:

• Depends on the lift of the wing.

• Is caused by junctions (e.g. between the wing and fuselage).

• Is caused by the shape of a body.

• Is generated due to shear stresses acting on the body surface.

Interference drag:

• Depends on the lift of the wing.

• Is caused by the shape of a body.

• Is generated due to shear stresses acting on the body surface.

• Is caused by junctions (e.g. between the wing and fuselage).

Parasite drag is made up of the following types of drag:

• Skin-friction drag + form drag only

• Skin-friction drag + form drag + induced drag

• Form drag + interference drag only

• Skin-friction drag + form drag + interference drag

Total drag is made up of the following types of drag:

• Skin-friction drag + form drag

• Parasite drag + wave drag + induced drag

• Skin-friction drag + wave drag

• Form drag + induced drag

Wave drag is a type of pressure drag.

• True

• False

Winglets and/or an increase in the wings aspect ratio will reduce:

• form drag.

• skin friction drag.

• parasite drag.

• induced drag.

As the speed of an aircraft increases...

• The total drag remains the same.

• The parasite drag increases and the induced drag decreases.

• The parasite drag decreases and the induced drag increases.

• The parasite drag increases and the induced drag increases.