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### 51 Cards in this Set

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 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