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SIFT Army Aviation Information Practice Test

Terms in this set (40)

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)
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