SIFT Army Aviation Information Exam Questions and Answers Already Passed Latest Update
Four forces acting on a helicopter in flight. - Answers Lift, Thrust, Weight, Drag
Induced Drag - Answers That part of the drag on an airfoil that arises from the development of lift.
Parasite Drag - Answers Drag from components that don't create lift. (Wheels, Fuselage)
The Venturi Effect - Answers The Venturi effect is the reduction in fluid pressure that results when a fluid
flows through a constricted section (or choke) of a pipe.
Cyclic Control - Answers Used to control direction/ tilt of aircraft.
The Collective (Control) - Answers Left side of the pilot, moves up and down. Alters angle of attack of
rotor blades
Throttle - Answers Controls power produced by the engine
Anti-torque pedals - Answers Control the yaw of the aircraft, where it is pointing
Advancing blade - Answers
Airfoil - Answers Either the rotor blades themselves or the horizontal stabilizers.
Angle of Attack - Answers The angle between the chord line of an airfoil and the airfoil's direction of
motion relative to the air. (Aerodynamic Angle)
Angle of Incidence - Answers Angle between chord line of each blade and the rotor system's place of
rotation. (Mechanical Angle)
Autorotation - Answers Loss of engine power, angle down so that air keeps the rotors spinning.
Freewheeling unit disconnects.
Blade Span - Answers Length from top of blade to drive shaft.
Chord/Chord Line - Answers
Coning/ Coning Angle - Answers Coning angle is the difference between the line perpendicular to the
mast and the blades in motion.
Coriolis Effect - Answers A rotating body spins at the same speed unless acted upon by an external force.
Dissymmetry of Lift - Answers The advancing blade experiences greater wind speed and as such
produces more lift than the retreating side. The is counteracted by allowing blades to flap up and down.
Driven Region - Answers Has the effect of slowing the rotor's spin.
Driving Region - Answers Supply's thrust.
Four forces acting on a helicopter in flight. - Answers Lift, Thrust, Weight, Drag
Induced Drag - Answers That part of the drag on an airfoil that arises from the development of lift.
Parasite Drag - Answers Drag from components that don't create lift. (Wheels, Fuselage)
The Venturi Effect - Answers The Venturi effect is the reduction in fluid pressure that results when a fluid
flows through a constricted section (or choke) of a pipe.
Cyclic Control - Answers Used to control direction/ tilt of aircraft.
The Collective (Control) - Answers Left side of the pilot, moves up and down. Alters angle of attack of
rotor blades
Throttle - Answers Controls power produced by the engine
Anti-torque pedals - Answers Control the yaw of the aircraft, where it is pointing
Advancing blade - Answers
Airfoil - Answers Either the rotor blades themselves or the horizontal stabilizers.
Angle of Attack - Answers The angle between the chord line of an airfoil and the airfoil's direction of
motion relative to the air. (Aerodynamic Angle)
Angle of Incidence - Answers Angle between chord line of each blade and the rotor system's place of
rotation. (Mechanical Angle)
Autorotation - Answers Loss of engine power, angle down so that air keeps the rotors spinning.
Freewheeling unit disconnects.
Blade Span - Answers Length from top of blade to drive shaft.
Chord/Chord Line - Answers
Coning/ Coning Angle - Answers Coning angle is the difference between the line perpendicular to the
mast and the blades in motion.
Coriolis Effect - Answers A rotating body spins at the same speed unless acted upon by an external force.
Dissymmetry of Lift - Answers The advancing blade experiences greater wind speed and as such
produces more lift than the retreating side. The is counteracted by allowing blades to flap up and down.
Driven Region - Answers Has the effect of slowing the rotor's spin.
Driving Region - Answers Supply's thrust.
