aerodynamic 2

Which line represents the total drag line of an aeroplane?

• Line c
• Line d
• Line b
• Line a

The diagram shows the parameter X versus TAS. If a horizontal flight is considered the axis X shows

• the induced drag
• the parasite drag
• the lift force
• the total drag

Induced drag at constant IAS is affected by:

• aeroplane wing location
• aeroplane weight
• engine thrust
• angle between wing chord and fuselage centre line

Induced drag is created by the:

• spanwise flow pattern resulting in the tip vortices
• propeller wash blowing across the wing
• separation of the boundary layer over the wing
• interference of the air stream between wing and fuselage

The induced drag:

• increases as the aspect ratio increases
• has no relation to the lift coefficient
• increases as the lift coefficient increases
• increases as the magnitude of the tip vortices decreases

The span-wise flow is caused by the difference between the air pressure on top and beneath the wing and its direction of movement goes from:

• beneath to the top of the wing via the wing tip
• the top to beneath the wing via the leading edge
• beneath to the top of the wing via the trailing edge
• the top to beneath the wing via the wing's trailing edge

The relationship between induced drag and the aspect ratio is:

• there is no relationship
• a decrease in the aspect ratio increases the induced drag
• an increase in the aspect ratio increases the induced drag
• induced drag = 1.3 aspect ratio value

A high aspect ratio wing produces:

• a decrease in stall speed
• less sensitivity to gust effects
• an increase in induced drag
• a decrease in induced drag

Which of the following aeroplane parts affect induced drag most?

• Wing root junction
• Engine cowling
• Landing gear
• Wing tip

Winglets:

• decrease the static lateral stability
• increase the manoeuvrability
• decrease the induced drag
• create an elliptical lift distribution