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Rotary-Wing Systems

Rotary-Wing Flight Control Systems

QuestionAnswer
What are the advantages of the helicopter over conventional aircraft? The lift and control are relatively independent of forward speed.
What are the main differences between the rotary-wing and fixed-wing aircraft? The fixed-wing aircraft gets its lift from a fixed airfoil surface.
What provides lift for a helicopter? Rotating airfoils called rotor blades.
What does the word helicopter mean? It comes from Greek words meaning helical wing or rotating wing.
What is known as the rotor disc area? The area of the circle, the radius of which is equal to the length of the rotor blade. (Engineers determined that the lift of a rotor is in proportion to the square of the length of the rotor blades).
What happens if the rotor is operated at a zero pitch (flat pitch)? No lift will develop.
How is the lift distribution evened out along the length of the rotor? It is common practice to twist the blade.
Why should rotor blades be polished to a mirrorlike surface? By making the rotor blades as smooth as possible, the parasite drag is reduced.
In formulas for lift and drag, why is the density of the air an important factor? The mass or density of the air reacting in a dwonward direction causes the lift that supports the helicopter.
What two factors is density dependent upon? Altitude and atmospheric changes.
What is the usual method of counteracting torque in a single main rotor? By a tail (antitorque) rotor.
Where is the auxiliary rotor mounted? It mounts vertically, or near vertical, on the outer portion of the tail boom.
What is dissymmetry of lift? The difference in lift existing between the advancing blade half of the disc and the retreating blade half.
How is rotor blade dissymmetry created? By the horizontal flight or by the wind when the helicopter is hovering.
Created by: bway
 

 



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