Army Aviation Section (Sift) UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Gravity - CORRECT ANSWER - Constantly pulls things downward
Lift - CORRECT ANSWER - Upward force created by difference in air pressure above
and below the blade (how the helicopter flies)
Airfoil - CORRECT ANSWER - blade
Top of the Blade - CORRECT ANSWER - Low pressure
Below Blade - CORRECT ANSWER - High Pressure
Pitch Angle (Angle of Incidence) - CORRECT ANSWER - Angle between chord line and
the direction of rotor's spin
AOA (Angle of Attack) - CORRECT ANSWER - Angle between chord line and direction
of incoming air
Chord Line - CORRECT ANSWER - Line drawn between leading edge and trailing edge
of airfoil
Positive AoA - CORRECT ANSWER - needed for lift
Weight - CORRECT ANSWER - Force acting on a body due to gravity
, Factors that increase effectiveness of lift / increase potency of weight -- Banking - CORRECT
ANSWER - vertical lift redirected into horizontal movement. Needs increased airfoil to
produce vertical lift
Load Factor (G-Load) - CORRECT ANSWER - Increases weight on airfoil : G = L1/L0
G-Load Factor
L1- Actual Load on Rotor Blades
L0 - Resting Load
Thrust - CORRECT ANSWER - Measured Horizontal Motion - Primarily created by
converting lift via alterations of pitch angle and AOA
Drag - CORRECT ANSWER - Thrust's opposing force -
More thrust - more drag
more velocity - more drag
Three Drag Types ---> - CORRECT ANSWER - Parasitic, Profile, Induced
Parasitic - CORRECT ANSWER - Object and air want to occupt same space - increases
with airspeed and is the dominant type of drag at high airspeeds. Caused by nonlifting parts like
fuesalge, hub, mast
Profile - CORRECT ANSWER - Drag from frictional resistance of spinning airfoils -
relatively less powerful
Induced - CORRECT ANSWER - empty Space filled by air above and below the blade
(Primary force @ low speeds)
Total Drag - CORRECT ANSWER - 3 subcategories added together
ACTUAL Exam Questions and CORRECT
Answers
Gravity - CORRECT ANSWER - Constantly pulls things downward
Lift - CORRECT ANSWER - Upward force created by difference in air pressure above
and below the blade (how the helicopter flies)
Airfoil - CORRECT ANSWER - blade
Top of the Blade - CORRECT ANSWER - Low pressure
Below Blade - CORRECT ANSWER - High Pressure
Pitch Angle (Angle of Incidence) - CORRECT ANSWER - Angle between chord line and
the direction of rotor's spin
AOA (Angle of Attack) - CORRECT ANSWER - Angle between chord line and direction
of incoming air
Chord Line - CORRECT ANSWER - Line drawn between leading edge and trailing edge
of airfoil
Positive AoA - CORRECT ANSWER - needed for lift
Weight - CORRECT ANSWER - Force acting on a body due to gravity
, Factors that increase effectiveness of lift / increase potency of weight -- Banking - CORRECT
ANSWER - vertical lift redirected into horizontal movement. Needs increased airfoil to
produce vertical lift
Load Factor (G-Load) - CORRECT ANSWER - Increases weight on airfoil : G = L1/L0
G-Load Factor
L1- Actual Load on Rotor Blades
L0 - Resting Load
Thrust - CORRECT ANSWER - Measured Horizontal Motion - Primarily created by
converting lift via alterations of pitch angle and AOA
Drag - CORRECT ANSWER - Thrust's opposing force -
More thrust - more drag
more velocity - more drag
Three Drag Types ---> - CORRECT ANSWER - Parasitic, Profile, Induced
Parasitic - CORRECT ANSWER - Object and air want to occupt same space - increases
with airspeed and is the dominant type of drag at high airspeeds. Caused by nonlifting parts like
fuesalge, hub, mast
Profile - CORRECT ANSWER - Drag from frictional resistance of spinning airfoils -
relatively less powerful
Induced - CORRECT ANSWER - empty Space filled by air above and below the blade
(Primary force @ low speeds)
Total Drag - CORRECT ANSWER - 3 subcategories added together
