SIFT Army Aviation Exam Questions and Answers 100% Pass

SIFT Army Aviation Exam Questions and Answers 100% Pass Airfoil - Blade that cuts through air so that air passes above and below it Top of an airfoil is ________ - Cambered Why is the top of an airfoil cambered? - To allow air to quickly get past the airfoil and create low pressure What happens to the air below the airfoil? - Has a shorter distance to travel and is slower, creating high pressure Lift - Upward force created by the difference in air pressure above and below the airfoil angle of incidence (pitch angle) - Angle between the cord line and the direction of the rotors spin Angle of Attack (AOA) - Angle between the chord line and the direction of incoming air To create lift you need a ________ AOA - Positive 2 | P a g e Katelyn Whitman© 2025, All Rights Reserved. How do you create a positive AOA - 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 - Cambered or nonsymmetrical Weight is an important factor in flight because: - 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? - Strong winds, adverse weather conditions, banking What is the most frequent factor that causes a change in weight mid-flight? - Banking the helicopter As the angle of a bank increases, what also needs to increase? - The angle of the airfoil which will produce more lift Load factor (G load) - Added strain created by banking and increasing the angle of the airfoil G load equation - G = L1 / L0 G - Load factor L1 - Actual load on the rotor blades L0 - Resting or normal load of the helicopter 3 | P a g e Katelyn Whitman© 2025, All Rights Reserved. Thrust - Force that moves the helicopter horizontally How do you create thrust? - Converting lift via alterations of the pitch angle and the AOA Drag - Opposing force to thrust What are the 3 subcategories of drag? - Profile, parasitic, and induced Parasitic drag - Increases with airspeed and is the dominate type of drag at high airspeeds Profile drag - Similar to parasitic, except it only concerns the drag created by the frictional resistance of spinning airfoils. Profile dra