SIFT Army Aviation Information Section Study Guide with Complete Solutions

SIFT Army Aviation Information Section Study Guide with Complete Solutions A Helicopter - Answer-Is a type of rotorcraft that is able to takeoff and land vertically, hover, and fly forward, backward, and side to side (laterally). Thrust engine - Answer-an engine that produces power and delivers it to overhead and tail rotors (on most helicopters) via one or more transmissions and drive shafts. Fuselage - Answer-Main Body of the helicopter Mast - Answer-Shaft protruding from the top Cowling - Answer-On the upper part of the fuselage of many helicopters, it covers the aircrafts engine and transmission. two to six rotor blade - Answer-How many rotor blades are attached to the mast via a rotor head? Flybar - Answer-also called a stabilizer bar. upper and lower swashplates, blade grips, control rods, pitch and scissor links, teeter or coning hinges, pitch horns, and counterweights - Answer-Rotor systems consist of what components? enhance flight stability by keeping the bar stable as the rotor spins, and to reduce crosswind thrust on the blades - Answer-What is the Flybars Function? cyclic collective, throttle and pedals - Answer-what are the pilot's flight instruments and controls? EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISH SEPTEMBER 2024 Page 2/11 Avionics - Answer-what are electronics used for navigation, communications and aircraft systems term? Weapons controls - Answer-How does the pilot use weapons from a military helicopter cockpit? weight, lift, thrust, and drag - Answer-what are the four aerodynamic forces that act on a helicopter when it is airborne? Lift - Answer-what is the force that counteracts an aircrafts weight and causes a helicopter to rise into the air and stay aloft. Lift - Answer-is produced by airfoils - rotor blades, in the case of helicopters - that move through the air at a speed sufficient to create a pressure differential between the two sides of the airfoils. Thrust - Answer-is an aircraft's forward force, which is created by one or more engines, and is transformed in the case of helicopters into rotary motion via the components mentioned. Generally, _______ acts parallel to the aircrafts longitudinal axis, but not always. Drag - Answer-opposes thrust; it is a rearward- acting force caused by airflow passing over the aircraft's structure and becoming disrupted. ________ acts parallel to the relative wind. Profile, induced and parasite - Answer-what are the three types of drag? Profile drag - Answer-Drag created by the blades' frictional resistance increases. Consists of skin friction created by surface imperfections and form drag. Induced drag - Answer-Drag created by air circulating around each rotor blade as it spins and creates lift; the circulation causes a vortex behind each blade. EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISH SEPTEMBER 2024 Page 3/11 Parasite drag - Answer-Drag created by helicopter components and attached equipment that do not contribute to lift, including the fuselage, tail section, skids or wheels, externally mounted engines, sensors and weapons. Bernoulli's Principle - Answer-Scientific Principle that energy cannot be created or destroyed- only its form can be changed - and a system's total energy does not increase or decrease Conservation of energy - Answer-Bernoulli's principle is based off this. It says that in a steady flow the sum of all forms of mechanical energy- a fluids potential energy plus its kinetic energy - along a streamline is the same at all points. Potential energy - Answer-what kind of energy would be left in the helicopter if it were airborne when it ran out of fuel? Autorotation - Answer-When the helicopter noses the helicopter down in order to keep air flowing over the rotor blades. when the helicopters potential energy is converted into kinetic energy. Venturi Effect - Answer-How spinning rotor blades can produce enough force to lift a helicopter off the ground, climb and maintain a crushing altitude, and how a moving tail rotor is able to generate a sideways, anti-torque force. Newton's Third Law of motion - Answer-"When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body." EMILLYCHARLOTTE 2024/2025 ACADEMIC YAER ©2024 EMILLYCHARLOTTE. ALL RIGHTS RESERVED FIRST PUBLISH SEPTEMBER 2024 Page 4/11 Counter-Clockwise direction, Clockwise direction - Answer-Rotor blades on helicopters designed and built in the United States, Canada, Britain, and Germany move in what direction when viewed from above, and what direction on rotary-wing aircraft made in Russian and other countries. Cyclic Control - Answer-the what, is located in front of the pilots cockpit. By moving this, the pilot varies the pitch of the main rotor blades on a cyclical basis via the complex rotor head system Collective - Answer-The what is on the left side of the pilots seat, moves up and down, and can be adjusted in terms of its position via a variable friction lock to prevent unwanted movement. Throttle - Answer-control that controls the power produced by the engine and rotates like on a motorcycle it is located at the end of the collective. Pedals - Answer-Helicopter anti-torque what are located on