CPAER GENERAL KNOWLEDGE - SHARPER EDGE
Chord - Answers -Straight line joining leading edge to the trailing edge
Camber line - Answers -Line which runs midway between upper and lower surfaces of
the airfoil joint the trailing and leading edge.
Camber - Answers -The measure of the curvature of the airfoil.
Expressed as a percentage
Angle of attack - Answers -The angle between the chord of the wing and the relative
airflow
Centre of pressure - Answers -Lift and drag act through the centre of pressure of the
wing. The centre of pressure moves with a change in the angle of attack.
Centre of gravity - Answers -The point through which the resultant of the weight of all of
the components on the aircraft can be considered to act.
The centre of ____ is ahead of the centre of _____. - Answers -Gravity, pressure.
Axes of rotation - Answers -Three axes which rotate about the aircrafts centre of gravity
Lateral axis associated with... - Answers -Pitch
Longitudinal axis associated with... - Answers -Roll
Vertical axis associated with.... - Answers -Yaw
Lift acts... - Answers -Perpendicular to relative airflow
Weight acts... - Answers -Towards the centre of earth (gravity)
Thrust acts... - Answers -Along the longitudinal axis in the direction of motion
Drag acts... - Answers -Parallel to relative airflow
Aspect ratio - Answers -The measure of the slenderness of a wing.
The ratio of the wing span to the wing chord.
Wings with a ___ aspect ratio are more efficient and aerodynamic. Why? - Answers -
High because they produce less induced drag.
.
, Induced at low.
When is drag the least? - Answers -Middle of the speed range. This is known as Vmd
(minimum drag speed)
Which type of drag changes with angle of attack? - Answers -Induced.
Drag and an increase in altitude... - Answers -Induced drag increases.
Parasite drag decreases.
Drag and aircraft weight... - Answers -Induced drag increases.
Parasite remains the same.
Drag and speeds... - Answers -Induced is highest at low speed and lowest at high
speeds.
Parasite is lowest at low speeds and highest at high speeds,
Ground effect - Answers -Induced drag is significantly reduced.
Wing tip vortices are also greatly reduced.
Ground effect will be greater on aircraft with... - Answers -Low wings and short landing
gear.
____ acts through the centre of gravity and ____ acts through the centre of pressure. -
Answers -Weight.
Lift.
The centre of ____ must always be in front of the centre of _____. - Answers -Gravity.
Pressure.
The further the distance between the two centres (forward c of g).... - Answers -The
larger nose down pitching moment, resulting in the requirement of more downwards
force created by the tail section decreasing performance due to an increase of induced
drag.
Maximum range - Answers -Maximizing the distance flown per unit of fuel.
Piston engines aircraft: speed for best lift to drag ratio.
Chord - Answers -Straight line joining leading edge to the trailing edge
Camber line - Answers -Line which runs midway between upper and lower surfaces of
the airfoil joint the trailing and leading edge.
Camber - Answers -The measure of the curvature of the airfoil.
Expressed as a percentage
Angle of attack - Answers -The angle between the chord of the wing and the relative
airflow
Centre of pressure - Answers -Lift and drag act through the centre of pressure of the
wing. The centre of pressure moves with a change in the angle of attack.
Centre of gravity - Answers -The point through which the resultant of the weight of all of
the components on the aircraft can be considered to act.
The centre of ____ is ahead of the centre of _____. - Answers -Gravity, pressure.
Axes of rotation - Answers -Three axes which rotate about the aircrafts centre of gravity
Lateral axis associated with... - Answers -Pitch
Longitudinal axis associated with... - Answers -Roll
Vertical axis associated with.... - Answers -Yaw
Lift acts... - Answers -Perpendicular to relative airflow
Weight acts... - Answers -Towards the centre of earth (gravity)
Thrust acts... - Answers -Along the longitudinal axis in the direction of motion
Drag acts... - Answers -Parallel to relative airflow
Aspect ratio - Answers -The measure of the slenderness of a wing.
The ratio of the wing span to the wing chord.
Wings with a ___ aspect ratio are more efficient and aerodynamic. Why? - Answers -
High because they produce less induced drag.
.
, Induced at low.
When is drag the least? - Answers -Middle of the speed range. This is known as Vmd
(minimum drag speed)
Which type of drag changes with angle of attack? - Answers -Induced.
Drag and an increase in altitude... - Answers -Induced drag increases.
Parasite drag decreases.
Drag and aircraft weight... - Answers -Induced drag increases.
Parasite remains the same.
Drag and speeds... - Answers -Induced is highest at low speed and lowest at high
speeds.
Parasite is lowest at low speeds and highest at high speeds,
Ground effect - Answers -Induced drag is significantly reduced.
Wing tip vortices are also greatly reduced.
Ground effect will be greater on aircraft with... - Answers -Low wings and short landing
gear.
____ acts through the centre of gravity and ____ acts through the centre of pressure. -
Answers -Weight.
Lift.
The centre of ____ must always be in front of the centre of _____. - Answers -Gravity.
Pressure.
The further the distance between the two centres (forward c of g).... - Answers -The
larger nose down pitching moment, resulting in the requirement of more downwards
force created by the tail section decreasing performance due to an increase of induced
drag.
Maximum range - Answers -Maximizing the distance flown per unit of fuel.
Piston engines aircraft: speed for best lift to drag ratio.
