SIFT: Army Aviation Information question n answers graded A+ 2023

SIFT: Army Aviation InformationWhat are the two types of engines in a helicopter, and which has the advantage? - correct answer Piston or Turbine. Turbine engines have more thrust per pound. The main body of a helicopter - correct answer Fuselage The system that converts the pilot's input into the flight controls to movement in the rotor blades: - correct answer Swashplate mechanical system Components of the rotor system: - correct answer Upper and lower swashplates Blade grips Control rods pitch and scissor links Teetor or coning hinges Pitch horns Counterweights What is the flybar (stabilizer bar) and what is its function? - correct answer One of the components that attaches the blades to the mast. Its function is to enhance flight stability by keeping the bar stable as the rotor spins, and to reduce crosswind thrust on the blades. Through mechanical linkages, the bar's rotation combines with the swashplate's movement to damp internal (steering) and external (wind) forces on the rotor. The mechanical device makes it easier for the pilot to control the helicopter. Ducted fan - correct answer Tail rotors that are encased in a formed metal shroud. This helps avoid people walking into the tail rotors What types of flight instruments can be found in a cockpit? - correct answer Controls (cyclic, collective, throttle, and pedals), avionics (electronics used for navigation, communications, and aircraft systems) weapons controls What are the four aerodynamic forces? - correct answer Weight, lift, thrust, and drag How do curved flight paths at high altitudes affect an aircraft's weight and the force of gravity? - correct answer The force of gravity, "G," that is exerted on the rotor blades becomes greater than the aircraft's total weight How does banking the aircraft affect weight? - correct answer Banking in order to turn more tightly increases G or weight. A 30 degree bank increase the weight by 16%, while a 60 degree bank increases weight by 100% as opposed to how much the aircraft weighs when flying in a straight and smooth path. Lift - correct answer Force that acts perpendicular to the direction of flight through the enter of lift. Lift is created by the pressure differential created above and below the air foils (rotor blades). Thrust - correct answer An aircraft's forward force, create by one or more engines. The mechanics of the rotors allows them to create thrust through the angle of attack (AOA). Drag - correct answer Opposes thrust. Rearward acting force caused by airflow passing over the aircraft's structure. Three types: profile, induced, and parasite. Profile Drag - correct answer Created by the friction between the rotor and tail blades and the air. It also includes skin frictions created by surface imperfections. Relative to the size and shape of the structure as it protrudes into the relative wind. Induced Drag - correct answer Created by air circulating around each rotor blade as it spins and creates lift; the circulation causes a vortex behind each blade. As more lift is produced, induced drag and rotor downwash both increase. Increasing the AOA of the rotor blades also results in stronger vortexes and greater induced drag. Parasite Drag - correct answer