# Shared Flashcard Set

## Details

Aerodynamic Principles
Jeppesen Chapter 3
33
Aviation
Professional
06/18/2013

Term
 The four forces acting on an airplane in flight are
Definition
 lift, weight, thrust, and dragAFH
Term
 When are the four forces that act on an airplane in equilibrium?
Definition
 During unaccelerated flight.AFH
Term
 (Refer to figure 1)The acute angle A is the angle of
Definition
 attack.PHB
Term
 The term "angle of attack" is defined as the angle
Definition
 between the wing chord line and the relative wind.PHB
Term
 What is the relationship if lift, drag, thrust, and weight when the airplane is in straight-and-level flight?
Definition
 Lift equals weight and thrust equals drag.AFH
Term
 One of the main functions of flaps during approach and landing is to
Definition
 increase the angle of descent without increasing the airspeed.AFH
Term
 What is one purpose of wing flaps?
Definition
 To enable the pilot to make steeper approaches to a landing without increasing the airspeed.AFH
Term
 The angle of attack at which an airplane wing stalls will
Definition
 remain the same regardless of gross weight.FTP
Term
 What is ground effect?
Definition
 The result of the interference of the surface of the Earth with the airflow patterns about an airplane.AFH
Term
 Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at
Definition
 less than the length of the wingspan above the surface.AFH
Term
 What must a pilot be aware of as a result of ground effect?
Definition
 Induced drag decreases; therefore, any excess speed at the point of flare may cause considerable floating.AFH
Term
 Ground effect is most likely to result in which problem?
Definition
 Becoming airborne before reaching recommended takeoff speed.AFH
Term
 Which statement relates to Bernoulli's principle?
Definition
 Air traveling faster over the cured upper surface of an airfoil causes lower pressure on the top surface.
Term
 The angle between the chord line of an airfoil and the relative wind is known as the angle of
Definition
 attack.
Term
 Changes in the center of pressure of a wing affect the aircraft's
Definition
 aerodynamic balance and controllabilityPHB
Term
 An airplane said to be inherently stable will
Definition
 require less effort to control.PHB
Term
 What determines the longitudinal stability of an airplane?
Definition
 The location of the CG with respect to the center of lift.PHB
Term
 What causes an airplane (except a T-tail) to pitch nose down when power is reduced and controls are not adjusted?
Definition
 The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.PHB
Term
 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
Definition
 difficulty in recovering from a stalled condition.AFH
Term
 Loading an airplane to the most aft CG will cause the airplane to be
Definition
 less stable at all speeds.AFH
Term
 In what flight condition must an aircraft be placed in order to spin?
Definition
 stalledAFH
Term
 During a spin to the left, which wing(s) is/are stalled?
Definition
 Both wings are stalled.AFH
Term
 In what flight condition is torque effect the greatest in a single-engine airplane?
Definition
 low airspeed, high power, high angle of attack.PHB
Term
 The left turning tendency of an airplane caused by P-factor is the result of the
Definition
 propeller blade descending on the right, producing more thrust than the ascending blade on the left.PHB
Term
 When does P-factor cause the airplane to yaw to the left?
Definition
 When at high angles of attack.PHB
Term
 (Refer to figure 2)If an airplane weighs 2,300 pounds, what approximate weight would the airplane structure be required to support during a 60 blanked turn while maintaining altitude?
Definition
 4,600 pounds.PHB
Term
 (Refer to figure 2)If an airplane weighs 3,300 pounds, what approximate weight would the airplane structure be required to support during a 30 banked turn while maintaining altitude?
Definition
 3,960 pounds.PHB
Term
 (Refer to figure 2)If an airplane weighs 4,500 pounds, what approximate weight would the airplane structure be required to support during a 45 banked turn while maintaining altitude?
Definition
 6,750 pounds.PHB
Term
 The amount of excess load that can be imposed on the wing of an airplane depends upon the
Definition
 speed of the airplane.PHB
Term
 Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
Definition
 Turns.PHB
Term
 What force makes an airplane turn?
Definition
 The horizontal component of lift.PHB
Term
 During an approach to a stall, an increased load factor will cause the airplane to
Definition
 stall at a higher airspeed.PHB
Term
 Select the four flight fundamentals involved in maneuvering an aircraft.
Definition
 Straight-and-level flight, turns, climbs, and descents.AFH
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