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51 Cards in this Set

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  • Back
Where is the buttock line or buttline of an aircraft?
A width measurement left or right of, and parallel to, the vertical centerline
An airplane wing that operates most efficiently at a high angle of attack has a _____.aspect ratio
high
In order to tilt the rotor disc of a helicopter forward, the pitch of the ________ blade is increased.
retreating
When supersonic air flows into a diverging duct, its velocity
increase
As the angle of attack of an airfoil increases, the center of pressure will
move toward the leading edge
The stall begins on a rectangular wing at the
root
When subsonic air flows into a diverging duct, its density
remains the same
When supersonic air flows into a converging duct, its velocity
decreases
An airplane stalls only when it reaches a critically
high angle of attack
The coriolis effect is most noticeable on ________-blade rotor systems
three
Movement of an airplane along its lateral axis (roll) is also movement
around or about the longitudinal axis controlled by the ailerons.
Vortex generators mounted on the empennage of an airplane improve flight characteristics at ________ speed
low
An airplane has positive longitudinal static stability when its center of gravity is ___________ the center of the lift.
ahead
The center pressure remains in essentially the same location as the angle of attack changes on a/an ___________ airf
symmetrical
The pitch of the rotor blade is changed at a particular point in their rotation by the _________ pitch control.
cyclic
An airplane's center of lift is usually located aft of its center of gravity
so that the airplane will have a nose-heavy tendency.
An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has
poor longitudinal stability
Improper rigging of the elevator trim tab system will affect the balance of the airplane about its
lateral axis.
The elevators of a conventional airplane are used to provide rotation about the
lateral axis.
The coriolis effect causes the rotor blades to move
back and forth
The primary purpose of stall strips is to
stall the inboard portion of the wings first
When subsonic air flows into a diverging duct, its pressure
increase
On large aircraft that has two sets of ailerons each wing, only the __________ ailerons are used when the trailing edge flaps are up.
inboard
The basic forces that act on an aircraft in flight are
thrust, drag, weight and lift
Washing-in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on the lift and drag of that wing?
Both drag and lift will increase due to increased angle of attack
When supersonic air flows into a converging duct, its density
increase
The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the
front spar
When supersonic air flows into a converging duct, its pressure
increase
When the lift of an airfoil increases, the drag will
also increases
An airplane which has good longitudinal stability should have a minimum tendency to
pitch
The retreating blade of a helicopter will stall when the helicopter airspeed is to
high
When subsonic air flows into a converging duct, its density
remains the same
If the right wing of a monoplane is improperly rigged to a greater angle of incidence than designated in the manufacturer's specifications, it will cause the
airplane to be off balance both laterally and directionally
When supersonic air flows into a diverging duct, its pressure
decreases
When supersonic air flows into a diverging duct, its density
decreases
When subsonic air flows into a diverging duct, its velocity
decreases
The angle of incidence of an airplane
does not change in flight
What type of flap system increases the wing area and changes the wing camber?
Fowler flaps
An airplane is controlled directionally about its vertical axis by the
rudder.
The angle of incidence is that acute angle formed by
a line parallel to the wing chord and a line parallel to the longitudinal axis of the aircraft.
Parasite drag increases as the airspeed_____________.
increases
When subsonic air flows into a converging duct, its velocity
increase
When air passes through a shock wave, its velocity is ____________.
decreased
The purpose of wing slats is to
reduce stalling speed
What physical factors are involved in the aspect ratio of airplane wings?
Span and chord
The correct dihedral angle can be determined by
using a dihedral board and bubble level along the front spar of each wing
The aerodynamic load on the tail of a longitudinally stable airplane acts _____________.
downward
The velocity of air that has passed through a normal shock wave is
subsonic.
When subsonic air flows into a converging duct, its pressure
decreases
Dihedral is used to give an airplane _________ stability?
lateral
The angle of attack at which the induced and parasite drags are the same produces the ________ L/D ratio.
maximum