SIFT Test Army Aviation Information verified to pass 2023

SIFT Test Army Aviation InformationHelicopter structure - correct answer fuselage (body of aircraft), mast, rotor blades engine drives power up through mast to rotor blades main rotor generates thrust, tail rotor counteracts torque main rotor rotates counterclockwise (US, UK, Ger.) advantages of rotorcraft - correct answer rotor blades (produce lift w/o requiring helicopter to move forward) provide the ability to takeoff vertically, hover in one place, and take off/land in places that would be impossible for fixed-wing planes. can also drop cargo, troops into challenging conditions Helicopter types - correct answer single main rotor tandem rotor coaxial rotor single main rotor helicopters - correct answer most common design; single main rotor generates power, secondary tail rotor offsets the effects of torque disadvantage - some power used for countering torque tandem rotor helicopters - correct answer two main rotating blade sections - front and rear; blades rotate counter to each other (thus torque is automatically offset) all power from engine can be used for lift coaxial rotor helicopter - correct answer two sets of blades rotating above and beneath each other; mounted to the same mast, rotate in opposite directions to each other advantage - reduces payload and allows greater cargo and passenger capacity Torque - correct answer a turning or twisting force; a force that causes rotation; the measure of a force's tendency to produce twisting or turning and rotation around an axis aerodynamic forces - correct answer thrust vs drag, weight vs lift drag - correct answer resistance by friction from air or water moving over a surface; acts against thrust caused by the shape and size of the aircraft disrupting the flow of air as it travels thrust - correct answer the pushing or pulling force exerted by the engine of an aircraft; created by the engine and transferred into motion via the mast and rotors thrust has to overcome drag and weight keeps helicopter moving forward Types of Drag Force - correct answer profile drag induced drag parasite drag total drag profile drag - correct answer Caused by the frictional resistance of helicopter blades passing through the air.