SIFT Army aviation Exam with Complete
Solutions
What is the Angle of attack (AOA)? - ANS-Angle between chord line and relative wind
What is a chord line? - ANS-An imaginary straight line from the leading edge to the
training edge of an airfoil
What is pitch angle? - ANS-Angle between the longitudinal axis of the aircraft and the
horizon.
What is an airfoil? - ANS-a streamlined shape designed to produce lift as it moves
through the air (props/wings)
What is needed in order to create lift? - ANS-Positive angle of attack
Load Factor - ANS-Ratio of the load supported by the aircraft to the actual weight of
aircraft and its contents. G=L1/L0
What is L1 in the load factor equation? - ANS-the weight the rotors are carrying
What is L0 in the load factor equation? - ANS-the weight of the aircraft by itself
What is the primary cause of lift? - ANS-change in pitch angle and angle of attack
What is the angle of incidence? - ANS-the angle between the aircraft's longitudinal axis
and the chord of the wing
What are the three categories of drag? - ANS-Parasitic Drag
Profile Drag
Induced Drag
What is parasitic drag? - ANS-Air resistance produced by any part of the aircraft that
does not produce lift.
What is profile drag? - ANS-Profile drag is incurred from frictional resistance of the
blades passing through the air.
At high airspeeds, profile drag increases rapidly with onset of blade stall or
compressibility.
, Induced Drag - ANS-Generated by the airflow circulation around the wing as it creates
lift.
what is maximum lift/drag ratio? - ANS-lift/Drag max
Basic Empty Weight - ANS-Standard empty weight plus optional equipment
Licensed empty weight - ANS-The basic empty weight with the engines and
transmission fluid excluded
what are the two purposes of the anti-torque pedals? - ANS-- counteract the torque of
the main rotor
- to create controlled rotation
(allows pilot to change heading)
what are the two sources of torque on the helicopter? - ANS-main rotor and tail rotor
what are the four fundamental maneuvers? - ANS-- straight-and-level flight
- turns
- climbing
- descending
what control is used for low speed turns? - ANS-Anti-torque pedals
what control is used for higher speed turns? - ANS-cyclic
what is a position control and what is an example? - ANS-any control the affects
position rather than velocity or acceleration.
- ex. collective
what is the ground effect? - ANS-the positive influence on the lifting characteristics of
the horizontal surfaces of an aircraft wing when it is close to the ground.
what is a rate control and what is an example? - ANS-a control that affects the rate of
change
- ex. anti-torque pedals
What is an acceleration control and what is an example? - ANS-a control that affects the
aircrafts acceleration and deceleration
- ex. cyclic
during hovering to forward flight, how fast should the aircraft be moving? - ANS-should
not exceed the pace of a brisk walk
Solutions
What is the Angle of attack (AOA)? - ANS-Angle between chord line and relative wind
What is a chord line? - ANS-An imaginary straight line from the leading edge to the
training edge of an airfoil
What is pitch angle? - ANS-Angle between the longitudinal axis of the aircraft and the
horizon.
What is an airfoil? - ANS-a streamlined shape designed to produce lift as it moves
through the air (props/wings)
What is needed in order to create lift? - ANS-Positive angle of attack
Load Factor - ANS-Ratio of the load supported by the aircraft to the actual weight of
aircraft and its contents. G=L1/L0
What is L1 in the load factor equation? - ANS-the weight the rotors are carrying
What is L0 in the load factor equation? - ANS-the weight of the aircraft by itself
What is the primary cause of lift? - ANS-change in pitch angle and angle of attack
What is the angle of incidence? - ANS-the angle between the aircraft's longitudinal axis
and the chord of the wing
What are the three categories of drag? - ANS-Parasitic Drag
Profile Drag
Induced Drag
What is parasitic drag? - ANS-Air resistance produced by any part of the aircraft that
does not produce lift.
What is profile drag? - ANS-Profile drag is incurred from frictional resistance of the
blades passing through the air.
At high airspeeds, profile drag increases rapidly with onset of blade stall or
compressibility.
, Induced Drag - ANS-Generated by the airflow circulation around the wing as it creates
lift.
what is maximum lift/drag ratio? - ANS-lift/Drag max
Basic Empty Weight - ANS-Standard empty weight plus optional equipment
Licensed empty weight - ANS-The basic empty weight with the engines and
transmission fluid excluded
what are the two purposes of the anti-torque pedals? - ANS-- counteract the torque of
the main rotor
- to create controlled rotation
(allows pilot to change heading)
what are the two sources of torque on the helicopter? - ANS-main rotor and tail rotor
what are the four fundamental maneuvers? - ANS-- straight-and-level flight
- turns
- climbing
- descending
what control is used for low speed turns? - ANS-Anti-torque pedals
what control is used for higher speed turns? - ANS-cyclic
what is a position control and what is an example? - ANS-any control the affects
position rather than velocity or acceleration.
- ex. collective
what is the ground effect? - ANS-the positive influence on the lifting characteristics of
the horizontal surfaces of an aircraft wing when it is close to the ground.
what is a rate control and what is an example? - ANS-a control that affects the rate of
change
- ex. anti-torque pedals
What is an acceleration control and what is an example? - ANS-a control that affects the
aircrafts acceleration and deceleration
- ex. cyclic
during hovering to forward flight, how fast should the aircraft be moving? - ANS-should
not exceed the pace of a brisk walk
