Podcast
Questions and Answers
With respect to differential aileron control, which of the following is true?
With respect to differential aileron control, which of the following is true?
- The ailerons have no effect on the aircraft's roll.
- The up going aileron moves through a smaller angle than the down going aileron.
- The down going aileron moves through a smaller angle than the up going aileron. (correct)
- The up going and down going ailerons both deflect to the same angle.
The aircraft fin is of symmetrical airfoil section and will therefore provide a side-load:
The aircraft fin is of symmetrical airfoil section and will therefore provide a side-load:
- only if a suitable angle of attack develops due to yaw.
- if a suitable angle of attack develops due either yaw or rudder movement. (correct)
- regardless of yaw or rudder movement.
- only when the rudder is moved.
If the left wing of an aircraft is flying low, the aileron trimmer control in the cockpit would be:
If the left wing of an aircraft is flying low, the aileron trimmer control in the cockpit would be:
- left unchanged as the aileron trim has no effect.
- moved down causing the left aileron to move down.
- moved up causing the left aileron to move up.
- moved up causing the left aileron to move down. (correct)
The purpose of a slot in a wing is to:
The purpose of a slot in a wing is to:
Large flap deployment causes:
Large flap deployment causes:
On a swept-wing aircraft, which part of the wing stalls first?
On a swept-wing aircraft, which part of the wing stalls first?
During flight, if an aircraft is yawing to the right, the aircraft would have a tendency to fly:
During flight, if an aircraft is yawing to the right, the aircraft would have a tendency to fly:
With a drop in ambient temperature, an aircraft's service ceiling will:
With a drop in ambient temperature, an aircraft's service ceiling will:
Extending a leading edge slat will have what effect on the wing's angle of attack?
Extending a leading edge slat will have what effect on the wing's angle of attack?
To ensure a wing stalls at the root first, stall wedges are installed:
To ensure a wing stalls at the root first, stall wedges are installed:
As a subsonic aircraft increases speed, what happens to its Centre of Pressure?
As a subsonic aircraft increases speed, what happens to its Centre of Pressure?
Which flight control surfaces are associated with asymmetric wing spoiler deployment?
Which flight control surfaces are associated with asymmetric wing spoiler deployment?
If an aircraft is yawing to the left, which way should the trim tab on the rudder be positioned?
If an aircraft is yawing to the left, which way should the trim tab on the rudder be positioned?
If an aircraft is flying with a left wing low, how should the left aileron trim tab be adjusted?
If an aircraft is flying with a left wing low, how should the left aileron trim tab be adjusted?
What is the purpose of the slot in the wing when a leading edge flap is fully extended?
What is the purpose of the slot in the wing when a leading edge flap is fully extended?
Which of the following statements about the Centre of Pressure is true for a subsonic aircraft?
Which of the following statements about the Centre of Pressure is true for a subsonic aircraft?
What happens to the drag on the outer wing when the ailerons are deflected?
What happens to the drag on the outer wing when the ailerons are deflected?
What movement is controlled by the Dutch roll?
What movement is controlled by the Dutch roll?
What happens when an aircraft is aerodynamically stable?
What happens when an aircraft is aerodynamically stable?
What plane do the ailerons control the aircraft in?
What plane do the ailerons control the aircraft in?
What is the main purpose of an anti-balance tab?
What is the main purpose of an anti-balance tab?
What is the primary function of slats?
What is the primary function of slats?
What should the pilot do to the aircraft's nose when extending the flaps?
What should the pilot do to the aircraft's nose when extending the flaps?
What is the primary use of flight spoilers?
What is the primary use of flight spoilers?
If the aircraft is flying nose-heavy, which direction should you move the elevator trim tab?
If the aircraft is flying nose-heavy, which direction should you move the elevator trim tab?
When are wing tip vortices the strongest?
When are wing tip vortices the strongest?
What type of instability is characterized by roll and yaw?
What type of instability is characterized by roll and yaw?
What is the primary function of vortex generators on an aircraft?
What is the primary function of vortex generators on an aircraft?
How do leading edge flaps affect the stalling angle of a wing?
How do leading edge flaps affect the stalling angle of a wing?
Where are Krueger flaps typically located on an aircraft?
Where are Krueger flaps typically located on an aircraft?
How does sweepback affect the lateral stability of an aircraft?
How does sweepback affect the lateral stability of an aircraft?
What is the effect of a plain flap on the wing area?
What is the effect of a plain flap on the wing area?
What is the primary cause of a roll to the right on an aircraft fitted with spoilers for lateral control?
What is the primary cause of a roll to the right on an aircraft fitted with spoilers for lateral control?
What does a Dutch roll refer to in aircraft dynamics?
What does a Dutch roll refer to in aircraft dynamics?
In what direction will an aircraft pitch when the trailing edge flaps are lowered?
In what direction will an aircraft pitch when the trailing edge flaps are lowered?
What causes pitch up on an aircraft with an all-moving tailplane?
What causes pitch up on an aircraft with an all-moving tailplane?
Which option correctly describes a leading edge slat's effect on the stalling angle of the wing?
Which option correctly describes a leading edge slat's effect on the stalling angle of the wing?
What is the function of a Krueger flap on an aircraft?
What is the function of a Krueger flap on an aircraft?
What is the layer of air over the surface of an aerofoil that is slower moving called?
What is the layer of air over the surface of an aerofoil that is slower moving called?
When the airflow velocity over an upper cambered surface of an aerofoil decreases, what happens to pressure and lift?
When the airflow velocity over an upper cambered surface of an aerofoil decreases, what happens to pressure and lift?
What is the primary effect of increasing the weight of an aircraft?
What is the primary effect of increasing the weight of an aircraft?
In a banked turn, what is required to maintain level flight?
In a banked turn, what is required to maintain level flight?
What is the primary function of flaps on an aircraft wing?
What is the primary function of flaps on an aircraft wing?
If one wing flap is partially extended, what effect would it have on the aircraft?
If one wing flap is partially extended, what effect would it have on the aircraft?
How does increasing flap deployment affect the stalling angle of a wing?
How does increasing flap deployment affect the stalling angle of a wing?
What is the effect of downward displacement of an aileron on the stalling angle of that wing?
What is the effect of downward displacement of an aileron on the stalling angle of that wing?
How does flap extension affect the tailplane angle of attack?
How does flap extension affect the tailplane angle of attack?
To maintain constant lift when extending flaps, what pitch adjustment is necessary?
To maintain constant lift when extending flaps, what pitch adjustment is necessary?
Which leading edge device improves laminar flow over the wing?
Which leading edge device improves laminar flow over the wing?
Study Notes
Aircraft Performance and Control
Centre of Pressure
- As a subsonic aircraft speeds up, its Centre of Pressure moves aft.
- This occurs when the aircraft reduces its angle of attack to remain at a constant altitude.
Wing Spoilers
- Wing spoilers, when used asymmetrically, are associated with ailerons.
- This is stated in the Pallett Automatic Flight Control 4th Edition and Jeppesen A&P Technician Airframe Textbook.
Trim Tabs
- If an aircraft is yawing to the left, the trim tab on the rudder should be positioned to the left.
- If an aircraft is flying with a left wing low, the left aileron trim tab should be moved up.
Leading Edge Flaps
- The slot in a wing, when a leading edge flap is fully extended, is used to re-energize the boundary layer.
- This is stated in the Pallett Automatic Flight Control 2nd Edition and Jeppesen A&P Technician Airframe Textbook.
Differential Aileron Control
- The down-going aileron moves through a smaller angle than the up-going aileron.
- This reduces the induced drag, which causes adverse aileron yaw.
Aeroplane Fin
- The aeroplane fin is of symmetrical aerofoil section and will provide a side-load if a suitable angle of attack develops due to either yaw or rudder movement.
Aircraft Stability
- If an aircraft is aerodynamically stable, it will return to its trimmed attitude.
- A drop in ambient temperature will increase an aircraft's service ceiling.
Flight Control
- Ailerons control the aircraft in the lateral plane.
- An anti-balance tab is used to give more feel to the controls.
Flaps and Slats
- Slats keep the boundary layer from separating for longer.
- Large flap deployment causes increased spanwise flow towards the wing tips.
- Leading edge flaps increase the stalling angle of the wing.
- Split flaps increase drag with little lift coefficient increase.
- Fowler flaps increase wing area and camber.
Aircraft Instability
- Dutch roll is a combined yawing and rolling motion.
- Sweepback will increase lateral stability.
- A split flap will increase drag with little lift coefficient increase.
Airflow and Lift
- The boundary layer is the layer of air over the surface of an aerofoil that is slower moving.
- When airflow velocity over an upper cambered surface of an aerofoil decreases, pressure increases, and lift decreases.
Weight and Drag
- Changes in aircraft weight cause corresponding changes in total drag due to the associated lift change.
- An increase in aircraft weight will increase the stalling speed.
Stalling
- When an aircraft stalls, lift decreases, and drag increases.
- The angle of attack at which stall occurs can be varied by using flaps and slats.
- The primary function of a flap is to alter the lift of an aerofoil.
Miscellaneous
- The tropopause exists at about 36,000 ft.
- Induced drag curve characteristics of a slender delta wing are such that there is a decrease in gradient with wing speed.
- If an aircraft is yawing left, the trim tab on the rudder would be positioned to the left, moving the rudder right.
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Description
Test your knowledge of aircraft aerodynamics with questions on variables like Centre of Pressure and Wing Spoilers. Learn about the effects of speed changes and asymmetric spoiler use on aircraft performance.
