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SIFT ARMY AVIATION EXAM 2024/2025 WITH 100% CORRECT ANSWERS
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  • August 7, 2024
  • 16
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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SIFT ARMY AVIATION EXAM 2024/2025 WITH 100%
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


Drag - correct answer Opposing force to thrust


What are the 3 subcategories of drag? - correct answer Profile, parasitic,
and induced


Parasitic drag - correct answer Increases with airspeed and is the
dominate type of drag at high airspeeds


Profile drag - correct answer Similar to parasitic, except it only concerns
the drag created by the frictional resistance of spinning airfoils. Profile
drag remains the same throughout flight neither dominating or
negligible.


Induced drag - correct answer Byproduct of the lift created by the rotor.
Only type of drag that typically decreases as airspeed increases. Induced

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