SIFT Army Aviation UPDATED ACTUAL
Exam Questions and CORRECT Answers
Airfoil - CORRECT ANSWER - Blade that cuts through air so that air passes above and
below it
Top of an airfoil is ________ - CORRECT ANSWER - Cambered
Why is the top of an airfoil cambered? - CORRECT ANSWER - To allow air to quickly
get past the airfoil and create low pressure
What happens to the air below the airfoil? - CORRECT ANSWER - Has a shorter distance
to travel and is slower, creating high pressure
Lift - CORRECT ANSWER - Upward force created by the difference in air pressure above
and below the airfoil
angle of incidence (pitch angle) - CORRECT ANSWER - Angle between the cord line and
the direction of the rotors spin
Angle of Attack (AOA) - CORRECT ANSWER - Angle between the chord line and the
direction of incoming air
To create lift you need a ________ AOA - CORRECT ANSWER - Positive
How do you create a positive AOA - CORRECT ANSWER - Front of the blade needs to
be raised above the back, relative to the wind
What type of airfoil can generate lift with zero or negative AOA - CORRECT ANSWER -
Cambered or nonsymmetrical
, Weight is an important factor in flight because: - CORRECT ANSWER - You need to
generate enough force to move the weight off the ground, thus requiring more lift
What 3 factors can cause a change in weight mid-flight? - CORRECT ANSWER - Strong
winds, adverse weather conditions, banking
What is the most frequent factor that causes a change in weight mid-flight? - CORRECT
ANSWER - Banking the helicopter
As the angle of a bank increases, what also needs to increase? - CORRECT ANSWER -
The angle of the airfoil which will produce more lift
Load factor (G load) - CORRECT ANSWER - Added strain created by banking and
increasing the angle of the airfoil
G load equation - CORRECT ANSWER - G = L1 / L0
G - CORRECT ANSWER - Load factor
L1 - CORRECT ANSWER - Actual load on the rotor blades
L0 - CORRECT ANSWER - Resting or normal load of the helicopter
Thrust - CORRECT ANSWER - Force that moves the helicopter horizontally
How do you create thrust? - CORRECT ANSWER - Converting lift via alterations of the
pitch angle and the AOA
Exam Questions and CORRECT Answers
Airfoil - CORRECT ANSWER - Blade that cuts through air so that air passes above and
below it
Top of an airfoil is ________ - CORRECT ANSWER - Cambered
Why is the top of an airfoil cambered? - CORRECT ANSWER - To allow air to quickly
get past the airfoil and create low pressure
What happens to the air below the airfoil? - CORRECT ANSWER - Has a shorter distance
to travel and is slower, creating high pressure
Lift - CORRECT ANSWER - Upward force created by the difference in air pressure above
and below the airfoil
angle of incidence (pitch angle) - CORRECT ANSWER - Angle between the cord line and
the direction of the rotors spin
Angle of Attack (AOA) - CORRECT ANSWER - Angle between the chord line and the
direction of incoming air
To create lift you need a ________ AOA - CORRECT ANSWER - Positive
How do you create a positive AOA - CORRECT ANSWER - Front of the blade needs to
be raised above the back, relative to the wind
What type of airfoil can generate lift with zero or negative AOA - CORRECT ANSWER -
Cambered or nonsymmetrical
, Weight is an important factor in flight because: - CORRECT ANSWER - You need to
generate enough force to move the weight off the ground, thus requiring more lift
What 3 factors can cause a change in weight mid-flight? - CORRECT ANSWER - Strong
winds, adverse weather conditions, banking
What is the most frequent factor that causes a change in weight mid-flight? - CORRECT
ANSWER - Banking the helicopter
As the angle of a bank increases, what also needs to increase? - CORRECT ANSWER -
The angle of the airfoil which will produce more lift
Load factor (G load) - CORRECT ANSWER - Added strain created by banking and
increasing the angle of the airfoil
G load equation - CORRECT ANSWER - G = L1 / L0
G - CORRECT ANSWER - Load factor
L1 - CORRECT ANSWER - Actual load on the rotor blades
L0 - CORRECT ANSWER - Resting or normal load of the helicopter
Thrust - CORRECT ANSWER - Force that moves the helicopter horizontally
How do you create thrust? - CORRECT ANSWER - Converting lift via alterations of the
pitch angle and the AOA
