SIFT Army Aviation Information Practice
Test/Questions and Answers
A helicopter is - -A type of rotorcraft
-Helicopter turbine engines produce ___________ thrust per pound than piston
engines - -More
-The four main forces working on a helicopter are - -Lift, weight, thrust, drag
-Helicopters typically have between ___ and ___ main rotor blades - -2 and 6
-Depending on the type of helicopter, main rotor system components can
include - -A stabilizer bar, upper/lower swashplates, counterweights, pitch
horns, teeter/coning hinges, blade grips, pitch/scissor links, control rods
-The function of the flybar is - -To decrease crosswind thrust on the blades
and enhance flight stability by keeping the bar stable as the rotor spins
-Many helicopters have a horizontal stabilizer located _____ - -On the tail
boom
-The purpose of the tail rotor is: - -To produce an anti-torque force acting
perpendicular to the helicopter's longitudinal axis.
-Wheels on _____ types of helicopters are _____ - -Some, retractable
-A pilot controls a helicopter using: - -Pedals, a collective, throttle, cyclic
-From a physics perspective, the _____ force is deemed to act through a
helicopter's _____ - -Total weight, center of gravity
-When a pilot banks a helicopter, causing it to turn, _____ - -The machine's
weight increases
-In the case of helicopters, lift is produced by _____ moving through the air at
a speed sufficient to create - -Airfoils, a pressure differential
-Thrust acts _____ to the aircraft's _____ - -Parallel, longitudinal axis
-Profile drag consists of - -Profile drag is usually defined as the sum of form
drag(Shape of the object) and skin friction(imperfections)
-Vortices produced by spinning rotor blades create - -Induced drag
Test/Questions and Answers
A helicopter is - -A type of rotorcraft
-Helicopter turbine engines produce ___________ thrust per pound than piston
engines - -More
-The four main forces working on a helicopter are - -Lift, weight, thrust, drag
-Helicopters typically have between ___ and ___ main rotor blades - -2 and 6
-Depending on the type of helicopter, main rotor system components can
include - -A stabilizer bar, upper/lower swashplates, counterweights, pitch
horns, teeter/coning hinges, blade grips, pitch/scissor links, control rods
-The function of the flybar is - -To decrease crosswind thrust on the blades
and enhance flight stability by keeping the bar stable as the rotor spins
-Many helicopters have a horizontal stabilizer located _____ - -On the tail
boom
-The purpose of the tail rotor is: - -To produce an anti-torque force acting
perpendicular to the helicopter's longitudinal axis.
-Wheels on _____ types of helicopters are _____ - -Some, retractable
-A pilot controls a helicopter using: - -Pedals, a collective, throttle, cyclic
-From a physics perspective, the _____ force is deemed to act through a
helicopter's _____ - -Total weight, center of gravity
-When a pilot banks a helicopter, causing it to turn, _____ - -The machine's
weight increases
-In the case of helicopters, lift is produced by _____ moving through the air at
a speed sufficient to create - -Airfoils, a pressure differential
-Thrust acts _____ to the aircraft's _____ - -Parallel, longitudinal axis
-Profile drag consists of - -Profile drag is usually defined as the sum of form
drag(Shape of the object) and skin friction(imperfections)
-Vortices produced by spinning rotor blades create - -Induced drag
