Formative Questions Flashcards
Motion about the lateral axis is called?
Pitch
Reducing airspeed will …
Reduce lift and decrease control effectiveness
What is the secondary effect of ailerons?
Yaw in the opposite direction to the roll (adverse yaw)
The spoiler deployed on the A/C in countering adverse yaw is due to?
Increased zero-lift drag on the down-going wing.
Motion above the vertical axis is called?
Yaw
High wing aircraft tend to be laterally stable due to?
As airflow divides to flow around the fuselage with sideslip, this puts the banked lower wing in an area of upwash, and the pendulum effect of the fuselage mass.
What are the cause of pilot induced oscillations?
When pilot made control inputs after a disturbance get out of phase with the A/C’s design stability correcting forces.
Increased fuselage “keel area” ahead of the aircraft CoG will do what to stability?
Decrease directional stability.
What is the primary effect of aileron?
Roll in teh direction towards the up aileron.
What is the angular difference between the tail plane chord and the chord line of the mainplanes called?
Longitudinal dihedral.
What is motion about the longitudinal axis called?
Roll
What occurs to the A/C with an increase in airspeed?
Pitch up and yaw to right.
What occurs to the A/C with a decrease in airspeed?
Pitch down and yaw to left
When would an aircraft require a tail-down balancing force to stabilise the A/C in pitch?
Weight acting ahead lift in the weight/lift couple, causing a nose down pitching moment.
What are passive and active stability?
Passive stability is the stability design features of the airframe, the shape and size of the tail surface areas for example. Active stability is stabilising inputs made by a computerized control system.
