Rotary Flight Controls
Terms
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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
- Torque
- 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
- Coning
- When a helicopter is close to the ground, will it require more or less power to maintain a hover
- less
- What term refers to main rotor rotation caused by air passing through the main rotor blades instead of being powered by the engine
- Autorotation
- 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
- four
- 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