POF Flashcards
POF
In an aircraft which is spinning to left the application of ailerons to the right -
May delay the spin recovery
Longitudinal dihedral is a design feature used as a method of improving stability -
About the lateral axis
Directional stability is an aeroplane is achieved-
Through the vertical fin
When gliding into wind-
The glide angle will increase
If only rudder is applied during straight and level flight the following will occur-
Yaw followed by roll and a spiral dive
If the pressure of a parcel of air is kept constant and the -
Temperature is increased the density will decrease
The use of a Horn balance in an aeroplane -
Improves the aerodynamic balance of the controls
The layer of air in contact with the surface of an aerofoil during flight is referred to as -
The boundary layer
During a steady climb the arrangement of the four forces is such that -
Thrust is greater than drag
Mass balance extending ahead of the hinge line is attached to the leading edge of a control surface in order to -
Prevent control flutter
In oder to maintain altitude during a turn -
The angle of attack must be increased
The angle of attack pf an aeroplane is define as the angle -
Between the relative airflow and the chrod line
The relationship between the four forces in level flight is that -
Lift is equal to weight and thrust equal to drag
During a flapless approach to land rhe nose position of the aeroplane will in relation to a normal approach with full flap be -
Higher
Application of flaps during a turn will -
Decrease the stall speed
The stalling angle of attack of a particular aerofoil -
Will remain constant irrespective of airspeed, bank angle or weight
An anti-balance or anti - servo tab which is incorporated in a stabilator will -
Move in the same direction as the control surface
A change in pitch will cause an aircraft to rotate around its -
Lateral axis and centre of gravity
During entry into a left hand turn drom straight and level flight rudder is normally applied in the same direction as ailerons in order to -
Correct the andverse yaw created by lowering the aileron on the right wing
When climbing to clear obstacles in the take-off path an aeroplane should climb-
At the best angle of climb speed
An aircraft which has its CG to aft would -
Be difficult to control in pitch
An increase in the AOA of an aileron will -
Decrease in pressure above the wing and increase drag
Whilst maintaining straight and level flight-
The centre of pressure is located behind the CG
In order to maintain elevator control effectiveness when loading an aeroplane it would be better to -
Have forward CG
When climbing the maximum height gained in the shortest distance will be achieved -
By climbing at the best angle of climb speed
Induced drag is created by-
The lift produced by the wings
If the temperature of a dry parcel of air is kept constant-
An increase in pressure will result in an increase of density
During a straight climb at a constant speed -
Lift is less than weight
The total lift produced by the wings during a balanced lever turn must equal-
The vertical component of lift and the centripetal force
A passenger carrying aeroplane is usually designed to have -
Dynamic stability
During a glide -
Application of flap will reduce the best lift drag ratio
The four forces acting on an aeroplane in a level flight are normally arranged so that-
An increase in thrust will cause the nose to pitch up
In respect of an aeroplanes wing the term “ aspect ratio” refers to the ratio of -
The wingspan to the mean aerodynamic chord
During autorotation stage of a spin to yhe left -
The left wing will have a greater angle of attack than the right wing
The AOA of an aeroplane is defined as the angle-
Between the chrod line and the relative airflow
Load factor is the term given to -
The resultant of centrifugal force and gross weight during a turn
In order to initiate soin recovery the controls should be used in the following manner-
Rudder is applied before elevator
An increase in induced drag can be expected-
When the AOA in increased
The stalling angle of attack of an aeroplane -
Remains constant regardless of airspeed or weight
The use of a Horn balance in an aeroplane-
Improves the aerodynamic balance of the controls
The symbol V in the lift formula refers to -
TAS
The lift force produced by an aerofoil always acts -
Perpendicular to the RAF
The initial effect of uncorrected aileron drag or adversed aileron yaw is to -
Cause an initial yaw to the right when rolling
Dust which is on the surface of a wing before flight will often still be there at the end of the flight because of -
Skin friction
During level flight the CG is normally-
Located forward of the CP
An anti balance or anti servo tab which in incorporated in stabilator will -
Move the same direction as the control surface
The forces acting on an aeroplane in a climb are so arranged that -
The value of lift is less than that of weight
Frise ailerons are a design feature which may be installed on some aeroplanes in order to -
Reduce aileron drag
The angle between the aerofoils chord line and the RAF is referred to as -
The Angle Of Attack
An aircraft which has its CG to far aft would -
Be difficult to control in pitch
When in climbing to clear obstacles in the T/O path an aeroplane should climb -
At best angle of climb speed
During the approach to a power of stall in level flight -
Contol effectiveness decrease at a steady rate
Adverse aileron yaw (aileron drag) will be most noticeable-
At a angle of attack
On an aerofoil the point through which the total lift acts is called the -
Centre of pressure
In accordance with Bernoullis theory when air flows through the throat of the venturi tube -
The velocity increases and the pressure decreases
The total lift produced by the wings during a balanced level turn must equal-
The vertical component of lift and the centripetal force
The position which seperates the laminar air flow from the turbulent airflow around an aerofoil is call -
The transition point
In comparison to a high aspect ratio wing a low aspect ratio wing will -
Create more induced drag
Ailerons may have to be used to Prevent the aeroplane from underbanking during -
A gliding turn
Frise ailerons are a design feature which may be installed on some aeroplanes in order to -
Reduce aileron drag
As the angle of attack of an aerofoil in normal level flight is increased the centre of pressure will -
Move forward
In terms of the ISA the sea level density of the air is -
1225 grammes per cubic meter and decreases with altitude
True airspeed (TAS) is -
CAS/RAS corrected for temperature and altitude
An aeroplane which has a high lift/drag ratio -
Will have a shallow gliding angle
Whilst maintaining straight and level flight-
The centre of pressure is located behind the centre of gravity
