SIFT Test: Army Aviation Information exam 2023 with 100% correct answers

Helicopter 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