Aerodynamics Flashcards
Practice Exam Cards to test your Aerodynamics Knowledge
Overpitching could be rectified by …
lowering the collective and opening throttle
An autorotative flare before landing is desirable to …
decrease rate of descent and forward airspeed
When the cyclic stick is moved forward in a helicopter with no advance angle you would expect the swash plate to …
tilt right
A helicopter in forward flight is dynamically and statically stable in what plane …
in the yawing plane only
The Centre of Pressure (CoP) of an aerofoil is …
a point along the chord line of an aerofoil through which the resultant or total reaction of all aerodynamic forces is siad to act
During autorotation, the rotor exerts friction forces on the transmission tending to …
yaw the aircraft left
With a delta three hinge, the flapping hinge is set at an angle so that …
when the blade flaps the pitch angle is altered
Overpitching is caused by …
increasing the collective to the extent that engine power cannot overcome rotor drag
An aerofoil produces lift by …
deflecting the airflow and causing an increase in velocity of the air flowing over the top surface
Refer to the Vector Diagram below:
The diagram represents the forces and airflow acting on a section of rotor blade during a steady hover in nil wind. Vector G represents the …
induced flow
The flapping action in a fully articulated main rotor system during sideways flight causes the advancing blade to …
rise and accelerate
The total reaction force is defined as …
the resultant of the pressure forces acting on an aerofoil
Drag is defined as …
the component of total reaction acting parallel to the relative airflow
The component of total reaction acting in the plane of rotation opposite to torque is called …
rotor drag
The most likely time that LTE would be experienced is …
during low airspeed manoeuvers with high main rotor pitch
What is the chord line of an aerofoil …
a straight line drawn from the centre of curvature of the leading edge of an aerofoil to the centre of the training edge of an aerofoil
Centrifugal force acts …
outwards parallel to the plane of rotation
The Angle of attack will increase if …
The pitch is increased
The lift formula is written as …
Lift = CL x half Rho x V2 x S
With respect to the lift formular, if the air density is increased, lift will …
increase
