Lift Flashcards
(28 cards)
To maintain altitude, what must be done as Indicated Airspeed (IAS) is reduced?
Increase angle of attack to maintain the correct lift force.
If more lift force is required because of greater operating weight, what must be
done to fly at the angle of attack which corresponds to C_LMAX (STALL)
Increase the Indicated Airspeed (IAS).
To generate a constant lift force, any adjustment in ___ must be
accompanied by a change in ___
To generate a constant lift force, any adjustment in IAS must be
accompanied by a change in angle of attack.
The greater the operating weight, the higher the minimum ___
The greater the operating weight, the higher the minimum IAS
What flight condition should be expected when an aircraft leaves ground effect?
An increase in induced drag and a requirement for a higher angle of attack.
If the angle of attack and other factors remain constant and airspeed is doubled,
lift will be:
four times greater. (L=1/2pV^2C_L*S
The angle between the _______ and the ____ is called the
aerodynamic incidence or angle of attack.
The angle between the CHORD LINE and the RELATIVE AIRFLOW is called the
aerodynamic incidence or angle of attack.
The definition of lift is:
the aerodynamic force which acts at 90° to the relative airflow.
An aerofoil section is designed to produce lift resulting from a difference in the:
higher air pressure below the surface and lower air pressure above the
surface.
On an aerofoil section, the force of lift acts perpendicular to, and the force of drag
acts parallel to the:
flight path.
When the angle of attack of a symmetrical aerofoil is increased, the centre of
pressure will:
remain unaffected.
Why does increasing speed also increase lift?
The increased speed of the air passing over an aerofoil’s upper surface
DECREASES THE STATIC PRESSURE, thus creating a GREATER pressure differential
between the upper and lower surface.
The point on an aerofoil section through which lift acts is the:
centre of pressure.
The angle between the chord line of the aerofoil section and the longitudinal axis
of the aircraft is known as:
the angle of incidence.
The angle between the chord line of an aerofoil section and the relative wind is
known as the angle of:
attack.
A line drawn from the leading edge to the trailing edge of an aerofoil section and
equidistant at all points from the upper and lower contours is called the:
mean camber line.
At zero angle of attack, the pressure along the upper surface of a symmetrical
aerofoil section would be:
less than atmospheric pressure.
The angle of attack of an aerofoil section directly controls:
the distribution of positive and negative pressure acting on the section.
When the angle of attack of a positively cambered aerofoil is increased, the centre
of pressure will:
move forward along the chord line.
The term “angle of attack’’ is defined as the angle:
between the section chord line and the relative wind.
How does the wake turbulence vortex circulate around each wing tip, when
viewed from the rear?
Outward, upward, and around the wing tip.
How can you alter the wake turbulence produced by a large transport aircraft?
The vortex characteristics of any given aircraft may be altered by extending
the flaps or changing the speed.
Wing tip vortices created by large aircraft tend to:
sink below the aircraft generating the turbulence.
Hazardous vortex turbulence that might be encountered behind large aircraft is
created only when that aircraft is:
developing lift
