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A103-Aerodynamic Principles
DA20 A103-Aerodynamic Principles
64
Aviation
Graduate
10/16/2013

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Cards

Term
The amount of excess load that can be imposed on the wing of an airplane depends on the
Definition
speed of the airplane
Term
Bank angles exceeding _____ degrees are prohibited by Doss procedures (not multiple choice
Definition
60
Term
The angle between the chord line of an airfoil and the relative wind is known as the angle of
Definition
Attack
Term
During the entry to a right turn, the nose of the aircraft swings slightly to the left before it swings along the horizon to the right. This is a
Definition
slipping entry, caused by adverse yaw; more right rudder pressure should have been applied for the amount of aileron pressure being used
Term
Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?
Definition
Turns
Term

When are the four forces that act on an aircraft in equilibrium?

Definition
during unaccelerated flight
Term
A pitch attitude exceeding _____ degrees from level flight is prohibited by Doss procedures (not multiple choice
Definition
30
Term
As altitude increases, the indicated airspeed at which an airplane stalls in the same configuration will
Definition
remain the same
Term
What will cause the nose of an aircraft to move in the direction of the turn before the bank starts in a turn entry?
Definition
Rudder being applied to soon
Term
Which of the following best describes “yaw”?
Definition
Control of the airplane about the vertical axis by using the rudder to move the nose right and left relative to the airplane’s flightpath
Term
How will frost on the wings of an airplane affect takeoff performance?
Definition
Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability
Term
Which V-speed represents maneuvering speed?
Definition
Va
Term
Why is frost considered hazardous to flight?
Definition
Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability
Term
Which of the following best describes “roll”?
Definition
Control of the airplane about the longitudinal axis by use of the ailerons to attain a desired bank angle in relation to the natural horizon
Term
An aircraft wing is designed to produce lift resulting from
Definition
higher air pressure below the wing’s surface and lower air pressure above the wing’s surface
Term
The airplane is trimmed for straight-and-level unaccelerated flight. The control stick is momentarily pushed forward and then released. If the airplane shows an initial tendency to return to the trimmed angle of attack, what type of stability has been demonstrated?
Definition
positive static longitudinal stability
Term
Which of the following best describes “pitch”?
Definition
control of the airplane about the lateral axis by using the elevator to raise and lower the nose in relation to the natural horizon
Term
When does P-factor cause the airplane to yaw to the left?
Definition
When at high angles of attack
Term
In what flight condition is torque effect the greatest in a single-engine airplane?
Definition
Low airspeed, high power, high angle of attack
Term
How does the wake turbulence vortex circulate around each wingtip?
Definition
Outward, upward, and around each tip
Term
The tendency of an aircraft to develop forces which restore it to its original condition, when disturbed from a condition of steady flight, is known as
Definition
Stability
Term
The amount of excess load that can be imposed on the wing of an airplane depends upon the
Definition
speed of the airplane
Term
The greatest vortex strength occurs when the generating aircraft is
Definition
heavy, clean, and slow
Term
What important airspeed limitation is not color coded on the airspeed indicator?
Definition
Maneuvering speed
Term
Which statement about adverse yaw is most correct?
Definition

adverse yaw can be seen during aileron deflection, when more lift on the rising wing results in more induced drag on that wing which pulls the nose toward the rising wing

Term
The term “angle of attack” is defined as the angle
Definition
between the wing chord line and the relative wind
Term
The airplane will stall at a higher indicated airspeed when excessive maneuvering loads are imposed by steep turns, pull-ups, or other abrupt changes in its flightpath; this is called
Definition
accelerated stall
Term
With the flaps in the CRUISE position, what is the positive load factor limit for the DA20-C1? (not multiple choice)
Definition
+4.4
Term

What causes an airplane to stall?

Definition
Exceeding the critical angle of attack
Term
What is ground effect?
Definition
The result of the interference of the surface of the Earth with the airflow patterns about the airplane
Term
Loading an airplane to the most aft CG will cause the airplane to be
Definition
less stable at all speeds
Term
What is the purpose of the rudder on an airplane?
Definition
to control yaw
Term
Which would likely result in a slipping turn?
Definition
increasing the rate of turn without using rudder
Term
During an approach to a stall, an increased load factor will cause the airplane to
Definition
stall at a higher airspeed
Term
Which action will result in an airplane exceeding its critical angle of attack?
Definition
Demanding more Gs than the wing can provide at a given airspeed
Term
What is one purpose of wing flaps?
Definition
To enable the pilot to make steeper approaches to a landing without increasing the airspeed
Term
During a spin to the left, which wing(s) is/are stalled?
Definition
both wings are stalled
Term
How does frost affect the lifting surfaces of an airplane on takeoff?
Definition
frost mat prevent the airplane from becoming airborne at normal takeoff speed
Term

In what flight condition must an airplane be placed in order to spin?

Definition
Stalled
Term
What force makes an airplane turn?
Definition
The horizontal component of lift
Term
The airplane is trimmed for straight-and-level unaccelerated flight. The control stick is momentarily pushed forward and then released. The airplane enters a series of self-damping pitch oscillations and eventually returns to straight-and-level unaccelerated flight at the trimmed angle of attack. What type of stability has been demonstrated?
Definition
Positive static and dynamic stability
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
Term
.  If severe turbulence is encountered, the aircraft’s airspeed should be reduced below
Definition
maneuvering airspeed
Term
The wind condition that requires maximum caution when avoiding wake turbulence on landing is a
Definition
light, quartering tailwind
Term
The four forces acting on an airplane in flight are:
Definition
Lift, weight, thrust and drag
Term
Ground effect is most likely to result in which problem?
Definition
Becoming airborne before reaching recommended takeoff speed
Term
What is the definition of Va?
Definition
The design maneuvering speed
Term
An airplane has been loaded in such a manner that the CG is located aft of the CG limit. One undesirable flight characteristic a pilot might experience with this airplane would be
Definition

difficulty in recovering from a stalled condition

Term
Which V-speed represents maneuvering speed?
Definition
Va
Term
Lift produced by an airfoil is the net force developed perpendicular to the
Definition
relative wind
Term

The angle of attack at which an airplane wing stalls will

Definition
remain the same regardless of weight.
Term
What is the definition of Vne?
Definition
Never exceed speed
Term
What determines the longitudinal stability of an airplane?
Definition
The location of the CG with respect to the center of lift
Term
Which statement relates to Bernoulli’s principle?
Definition
Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface
Term
If an airplane weighs 4,500 pounds, what approximate weight would the airplane structure be required to support during a 45 degree banked turn while maintaining altitude? (chart included)
Definition
6,300 pounds
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
Term
L/D Max, the speed which results in the maximum lift-to-drag ration, is also
Definition
the best glide airspeed
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
Term
What is the relationship of lift, drag, thrust and weight when the airplane is in straight and level, unaccelerated flight?
Definition

lift equals weight and thrust equals drag

Term
Wingtip vortices created by aircraft tend to
Definition
sink below the aircraft generating turbulence
Term
With the flaps in the CRUISE position, what is the negative load factor limit for the DA20-C1? (not multiple choice)
Definition
-2.2
Term
What causes an airplane to pitch nosedown 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
Term
A propeller rotating clockwise (as seen from the rear) creates a spiraling slipstream that tends to rotate the airplane to the
Definition
left around the vertical axis
Term
An Airplane said to be inherently stable will
Definition
require less effort to control
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