SIFT Army Aviation Information Practice Test 2023 verified to pass

SIFT Army Aviation Information Practice TestWhat part decrease crosswind thrust on the blades and enhance flight stability by keeping the bar stable as the rotor spins - correct answer The flybar Helicopter turbine engines produce ___________ thrust per pound than piston engines - correct answer More The four main forces working on a helicopter are - correct answer Lift, weight, thrust, drag Helicopters typically have between ___ and ___ main rotor blades - correct answer 2 and 6 Many helicopters have a horizontal stabilizer located _____ - correct answer On the tail boom To produce an anti-torque force acting perpendicular to the helicopter's longitudinal axis. - correct answer tail rotor From a physics perspective, the _____ force is deemed to act through a helicopter's _____ - correct answer Total weight, center of gravity When a pilot banks a helicopter, causing it to turn, _____ - correct answer The machine's weight increases In the case of helicopters, lift is produced by _____ moving through the air at a speed sufficient to create ______ - correct answer Airfoils, a pressure differential Thrust acts _____ to the aircraft's _____ - correct answer Parallel, longitudinal axis Vortices produced by spinning rotor blades create - correct answer Induced drag defined as the sum of form drag(Shape of the object) and skin friction(imperfections) - correct answer Profile drag When plotted on a graph, L/DMAX is the point where the helicopter's _____ - correct answer Total lift-to-drag ratio is the greatest A helicopter's potential energy is affected by - correct answer The aircraft's height above the ground Which of the following factors affect the lift produced by spinning rotor blades - correct answer Airfoil coefficient of lift, air density, blade area What happens when a helicopter's main rotor blades spin rapidly? - correct answer The upper and lower sides of each blade experience a difference in pressure Newton's third law of motion applies to helicopters because - correct answer The spinning main rotor makes the aircraft try to spin in the opposite direction When the pilot pushes the cyclic forward - correct answer The main rotor disk tilts forward Multi-engine helicopters have - correct answer A throttle lever for each engine For helicopters with a main rotor disk that spins counter-clockwise, the _____ airflow speed happens when each blade reaches the _____ position. - correct answer Maximum/ three o'clock (right) On the advancing rotor blade, lift _____ and the blade _____ - correct answer increases, moves upward The angle between the _____ of a rotor blade and its direction of motion relative to the _____ is the angle of attack, which is _____ angle - correct answer Chord line, air, an aerodynamic