30 Questions
Which type of stability is concerned with the way the restorative forces act with regard to time?
Dynamic stability
What type of stability does a ball possess when it tends to roll back down to its original position after being rolled up the side of a valley?
Positive static stability
What type of stability does a ball possess when it has no tendency to return to its original position after being released from the top of a slope?
Negative static stability
What type of stability does a body possess when the restorative forces that tend to bring it back to its position of equilibrium neither increase nor decrease in amplitude with time?
Neutral dynamic stability
Which axis of an aircraft is also known as the yaw axis?
The Vertical axis
Which axis of an aircraft passes through the centre of gravity and extends parallel to the wing span?
The Lateral axis
What is the control of movement (roll) about the longitudinal axis of an aircraft?
Ailerons
Which axis of an aircraft is a straight line through the fuselage, passing through the centre of gravity?
The Longitudinal axis
Which axis of an aircraft is controlled by the elevators connected to the control column?
Lateral Axis
What is the term for the unwanted yaw in the opposite direction of a roll, caused by the drag of the downward moving aileron on the higher wing in the roll and the additional lift of the wing?
Adverse Yaw
Which method can be used to counteract the adverse yaw in an aircraft?
Applying more rudder input in the same direction as the roll
What is the term for the unwanted roll in the same direction as a yaw, due to the faster outer wing in the turn generating more lift?
Unwanted Roll
Which of the following is true about longitudinal stability in an aircraft?
Longitudinal stability is determined by the center of gravity with respect to the center of lift.
Which statement accurately describes the effect of a downdraft on an aircraft trimmed for a given airspeed?
The nose will drop, the airspeed will increase, and the tail load will increase.
Which factor primarily provides lateral stability in an aircraft?
The dihedral angle of the wings.
What is the purpose of the elevators on the tail plane in an aircraft?
To provide longitudinal stability.
Which of the following statements is true about the directional stability of an aircraft?
The amount of directional stability is directly proportional to the size of the vertical fin and the distance the fin is located aft of the C of G.
What is the purpose of the vertical fin in an aircraft?
To provide stability about the vertical axis.
What is the effect of the corkscrewing slipstream on an aircraft?
It pushes the tail to the right.
What is the cause of the yawing moment in an aircraft following the failure of an engine?
The decrease in thrust and increase in drag on the side with the failed engine.
Which of the following factors primarily affects lateral stability in an aircraft?
Dihedral
What is the purpose of dihedral in an aircraft?
To provide lateral stability
How does sweepback affect the lateral stability of an aircraft?
Increases lateral stability
What is the purpose of the vertical fin in an aircraft?
To provide directional stability
Which of the following factors primarily affects the ability of the pilot to counteract the yawing moment due to asymmetric thrust?
All of the above
Which of the following is true about the minimum control speed (VMC)?
It is the minimum speed at which directional control can be maintained following engine failure
What is the effect of torque on an aircraft?
It causes the aircraft to roll in the opposite direction of the propeller rotation
What is Dutch Roll and Spiral Instability?
A form of dynamic instability that requires an automatic yaw damper for correction
What is the purpose of the vertical fin in an aircraft?
To provide directional stability
What is the term for the tendency of the aircraft to roll in the opposite direction to that in which the propeller is rotating?
Torque
Test your knowledge on directional stability in aircraft with this quiz. Learn about the relationship between the vertical areas, the role of the center of gravity, and the ability of an aircraft to return to a straight and level flight path.
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