SIFT: Helicopter knowledge Exam
Questions and Answers
A helicopter is: - ANS-A rotorcraft
Helicopter turbine engines produce _____ thrust per pound than piston engines - ANS-
more
The main forces acting on a helicopter are: - ANS-Lift, weight, thrust, and drag.
Helicopters typically have between ___ and ___ main rotor blades. - ANS-2, 6.
Depending on the type of helicopter, main rotor system components can include: - ANS-
A stabilizer bar, upper and lower swashplates, and counterweights. Pitch horns, teeter
or coning hinges, and blade grips. Pitch and scissor links, and control rods.
The function of the flybar is: - ANS-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: - ANS-On the tail boom.
The purpose of the tail rotor is: - ANS-To produce an anti-torque force acting
perpendicular to the helicopter`s longitudinal axis.
Wheels on ___ types of helicopters are ____: - ANS-Some, retractable.
A pilot controls a helicopter using: - ANS-Pedals, and a collective, throttle, and cyclic.
From a physics perspective, the ___ force is deemed to act through a helicopter`s
_______: - ANS-Total weight, center of gravity.
When a pilot banks a helicopter, causing it to turn, ____________: - ANS-The
machine`s weight increases.
In the case of helicopters, lift is produced by _______ moving through the air at a speed
sufficient to create __________: - ANS-airfoils, a pressure differential.
Thrust acts _____ to the aircraft`s_______: - ANS-parallel, longitudinal axis.
During an autorotation in forward flight, the rotor disk takes in _______ air and the
driven, driving, and stall regions of each blade move ______ along its length (span), but
only on the _______ side of the disk: - ANS-upward flowing, outboard, retreating.
Questions and Answers
A helicopter is: - ANS-A rotorcraft
Helicopter turbine engines produce _____ thrust per pound than piston engines - ANS-
more
The main forces acting on a helicopter are: - ANS-Lift, weight, thrust, and drag.
Helicopters typically have between ___ and ___ main rotor blades. - ANS-2, 6.
Depending on the type of helicopter, main rotor system components can include: - ANS-
A stabilizer bar, upper and lower swashplates, and counterweights. Pitch horns, teeter
or coning hinges, and blade grips. Pitch and scissor links, and control rods.
The function of the flybar is: - ANS-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: - ANS-On the tail boom.
The purpose of the tail rotor is: - ANS-To produce an anti-torque force acting
perpendicular to the helicopter`s longitudinal axis.
Wheels on ___ types of helicopters are ____: - ANS-Some, retractable.
A pilot controls a helicopter using: - ANS-Pedals, and a collective, throttle, and cyclic.
From a physics perspective, the ___ force is deemed to act through a helicopter`s
_______: - ANS-Total weight, center of gravity.
When a pilot banks a helicopter, causing it to turn, ____________: - ANS-The
machine`s weight increases.
In the case of helicopters, lift is produced by _______ moving through the air at a speed
sufficient to create __________: - ANS-airfoils, a pressure differential.
Thrust acts _____ to the aircraft`s_______: - ANS-parallel, longitudinal axis.
During an autorotation in forward flight, the rotor disk takes in _______ air and the
driven, driving, and stall regions of each blade move ______ along its length (span), but
only on the _______ side of the disk: - ANS-upward flowing, outboard, retreating.
