Airplanes And Aerodynamics Flashcards
What is one purpose of wing flaps?
To enable the pilot to make steeper approaches to a landing without increasing the airspeed.
One of the main functions of flaps during approach and landing is to?
Increase the angle of descent without increasing the airspeed.
What is the purpose of the rudder on an airplane?
To control yaw.
Which is not a primary flight control surface?
Flaps
The elevator controls movement around which axis?
Lateral
Which statement is true concerning primary flight controls?
The effectiveness of each control surface increases with speed because there is more flow over them.
Which of the following is true concerning flaps?
Flaps allow an increase in the angle of descent without increasing airspeed.
Which device is a secondary flight control?
Spoilers.
Trim systems are designed to do what?
They relieve the pilot of the need to maintain constant back pressure on the flight controls.
The four forces acting on an airplane in flight are?
lift, weight, thrust, and drag
When are the four forces that act on an airplane in equilibrium?
During un-accelerated flight
What is the relationship of lift, drag, thrust, and weight when the airplane is in straight and level flight?
lift equals weight and thrust equals drag
Which statement relates to Bernoulli’s principle?
Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
The term “angle of attack” is defined as the angle…
between the wing chord line and the relative wind.
Angle of attack is defined as the angle between the chord line of an airfoil and the
direction of the relative wind
The angle between the chord line of an airfoil and the relative wind is known as the angle of
attack.
The angle of attack at which an airplane wing stalls will
remain the same regardless of gross weight
As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will
remain the same regardless of altitude
In what flight condition must an aircraft be placed in order to spin?
Stalled
During a spin to the left, which wing(s) is/are stalled?
Both wings are stalled
How will frost on the wings of an airplane effect takeoff performance?
Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability
Why is frost considered hazardous to flight?
Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability
How does frost affect the lifting surfaces of an airplane on takeoff?
Frost may prevent the airplane from becoming airborne at normal takeoff speed
What is ground effect?
The result of the interference of the surface of the Earth with the airflow patterns about an airplane/
Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at?
Less than the length of the wingspan above the surface
What must a pilot be aware of as a result of ground effect?
Induced drag decreases; therefore any excess speed at the point of flare may cause considerable floating.
Ground effect is most likely to result in which problem?
Becoming airborne before reaching recommended takeoff speed
What force makes an airplane turn?
The horizontal component of lift
An airplane said to be inherently stable will?
Require less effort to control
What determines the longitudinal stability of an airplane?
The location of the CG with respect to the center of lift
Changes in the center of pressure of a wing affect the aircraft’s…
Aerodynamic balance and controllability
An airplane has been loaded in such a manner that the CG is located aft of the aft CG limit. One undesirable flight characteristic a pilot might experience with this airplane would be.
difficulty in recovering from a stalled condition
What causes an airplane (except a T-tail) to pitch nose down when power is reduced and controls are not adjusted?
The down wash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced
Loading an airplane to the most aft CG will cause the airplane to be?
less stable at all speeds
In what flight condition is torque effect the greatest in a single-engine airplane?
Low airspeed, high power, high angle of attack
The left turning tendency of an airplane caused by P-factor is the result of the…
propeller blade descending on the right, producing more thrust than the ascending blade on the left
When does P-factor cause the airplane to yaw to the left?
When at high angles of attack
The amount of excess load that can be imposed on the wing of an airplane depends on the…
speed of the airplane
Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
Turns
During an approach to a stall, an increased load factor will cause the aircraft to….
stall at a higher speed
