SIFT Army Aviation question n answers graded A+ 2023

SIFT Army Aviation What gives a helicopter its lifting force? - correct answer Airfoil What is a "airfoil"? - correct answer A blade; it cuts through the air so it passes above and below it. The top of the airfoil is ____ . - correct answer curved What results in high pressure from the airfoil? - correct answer The air that goes below the airfoil has a shorter distacne to travel and is slower. The amount of lift depends on what things? - correct answer the material, the shape of the airfoil, and the density of the air What factors can a pilot influence in generating the amount of lift? - correct answer The pitch angle and the AOA What is a AOA? - correct answer the angle between the chord line and the direction of incoming air. ( an imaginary line at the tip of the aircraft, outwards) * the greater the AOA is the greater the portion of the force that is directed rearwards. AOA is greatest at lower airspeeds & reduced at higher airspeeds. What is a pitch angle? - correct answer The angle between the chord line and the direction of the rotor's spin. What is a chord line? - correct answer a line between the leading edge and the trailing edge of the airfoil. ( imaginary line created at the top of an aircraft) How do you TYPICALLY generate lift? - correct answer A positive AOA ( the front of the blade needs to be raised above the back).