Glossary of Rotary Flight Controls

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What produces the lift required for helicopter flight
Rotor blades
When the camber is the same on both surfaces of an airfoil and results in a fixed center of pressure, what term describes the helicopter airfoil
It is symmetrical
What determines the amount of lift generated by a helicopter's rotor
The lift of a rotor is proportional to the square of the length of the rotor blades
What is the result of highly polished rotor blades
Parasite drag is reduced
Where is density altitude at its greatest
At sea level
On a single main rotor helicopter, the tail rotor is used to counteract what force
Other than horizontal flight, how is rotor blade dissymmetry created
By the wind when the helicopter is hovering
What type of main rotor allows individual rotor baldes to move in both a vertical and horizontal plane to reduce vibration caused by blade flapping
Articulated rotor
The upward bending of rotor blades is known by what term
When a helicopter is close to the ground, will it require more or less power to maintain a hover
What term refers to main rotor rotation caused by air passing through the main rotor blades instead of being powered by the engine
What term describes the effect that occurs when a helicopter experiencces an uncontrollable loss of altitude because of a combination of heavy gross weight, poor density conditions, and low forward speed.
Power settling
What is the most common type of helicopter
Single main rotor with vertical or near vertical tail rotor
The CH-46 multirotor helicopter has what type of rotor design
Tandem rotor system
What feature provides the single rotor configuration with excellent directional control
The vertical tail rotor
In what direction does a tandem rotor operate that results in little torque
Tandem rotors operate in opposte directions
What pitch control system provides lateral helicopter movement
Cyclic pitch control system
What pitch control system provides vertical helicopter movement
Collective pitch control system
What does the rotary rudder system control
Directional heading
On the rotary rudder control system, what component is preloaded to 600 pounds and considered hazardous to personnel
The negative force gradient spring
How many seperate banks of servomechanisms make up the auxiliary servo cylinder
What component controls and transfers independent movements of the lateral, forward, aft, and directional controls
Mixing unit
The movement of what valve allows hydraulic fluid flow in the three primary servo cylinders
Pilot valve
What unit sends movement, through the adjustable pitch control rods, to the sleeve and spindle assembly of the rotary blades to change the angle of incidence of the blades
The swashplate assembly
What test is required after a helicopter has been rigged
A flight test
Proper blade tracking prevents what condition
Directional heading
What blade-tracking device can be used in flight or on the ground
The strobes blade tracker
What adssembly is comparable to a single disc wheel brake in its design and operation
A rotor brake assembly
What component prevents hydraulic pressure from entering the blade fold system during flight
Safety valve
What is the blade fold accumulator nitrogen preload pressure that maintains hydraulic pressure in the rotary-wing head
1500 psi nitrogen pressure
Before you charge the blade fold accumulator with nitrogen, the blades should be in what position
Spread position

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