Principle of flight Flashcards
What is the most correct definition of a glide range
The glide range does not vary with the weight of an aircraft
The correct meaning of the term “ambient pressure” is
A pressure affected by the presence of the aircraft
What does it mean Iroh for chord line
A body that gives a large lift force comparing with its drag when setting at a small angle to a moving airstream
Washout on a wing is
The decrease in the angle of incidence for the wing root to the tip
What is the correct definition for aspect ratio
Is the ratio of the wing’s span to eat geometric chord
What are the characteristics of a swept wing
Swept wings are designed to achieved higher cruise speed but with poor lift capabilities especially at lower speed
What are the disadvantages for swept wing
Poor lift qualities, higher stall speed, speed instability, wing-tip deep stalling tendency
In which part of the wing does a swept wing stall first
Swept wing will stall at the wing tip first
Why does a swept wing stall first at the wing tip
Because the swept wing has a greater loading experience at the wing tip leading to a higher angle of incidence
State the correct definition of a Dutch roll
Dutch role is a couple lateral-directional oscillation in which the rolling motion is phased to precede the yawing motion
What are the main effect during at Dutch roll
Dutch roll causes the outer wing to travel faster becomes more straight to the relative airflow and the inner wing to travel slower becomes more swept to the airflow
What is the correct definition for a Dutch roll
Dutch rule is an oscillatory instability around longitudinal axis of the aircraft induced either by a natural disturbance or by a un/commanded yaw input on a swept wing aircraft
What is the correct definition of a lateral stability
Lateral stability is the tendency for an aircraft to regain a laterally level position around the longitudinal axis on release of the ailerons during a sideslip
What is the correct definition for longitudinal stability
Longitudinal stability is the tendency for an aircraft to regain a stable pitch position around its lateral axis after a disturbance
What is the aileron reversal
Aileron reversal occurs at high speeds when the air loads are large enough to cause an increase in lift
What is true about the spoilers
The spoilers cause an overall loss of lift which may cause a loss of height and is not recommended when flying near to the ground
Which are the two advantages of spoiler comparing with the ailerons
Decreased adverse yaw but more effective at low speeds
Why do the spoilers blow back
The spoilers blow back because the high air loads experience on their surveys are greater than their design limit
What is the main purpose of extending the flap in-flight
Flaps in-flight will cause a nose up pitching moment because the center of pressure remains in front of the center of gravity
What is true about extending the flap in-flight
Lowering the flap in flight will cause a loss of lift if not compensated by increasing the speed and changing the attitude
What is a yaw damper
A gyro which is sensitive to changes in yaw
What is important about the stabilizer
To provide a longitudinal balancing force to the aircraft
The center of pressure:
Is a single point acting at right angle to the relative airflow
