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Coning - PowerPoint PPT Presentation


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Coning. As the helicopter develops lift during takeoff and flight, the the blade tips rise above the straight-out position and assume a coned position. Primary forces involved:. Centrifugal Force: T he force which tends to make rotating bodies move away from the center of rotation

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Presentation Transcript
slide1

Coning

As the helicopter develops lift during takeoff and flight, the

the blade tips rise above the straight-out position and assume

a coned position.

Primary forces involved:

Centrifugal Force: The force which tends to make rotating bodies move away from the center of rotation

Centrifugal force adds rigidity to the rotor blade, causing it to assume a straight-out position

Lift: As the collective is increased and lift develops, the blades respond by

rising above the straight-out position

slide2

Centrifugal Force

Coning

Resultant: The combined effects of centrifugal force and lift

cause the blades to assume a coned position.

The angle between the straight-out position and the path

flown by the blades is the coning angle.

Some amount of coning is normal, however, excessive coning

can create problems

Resultant

Lift

slide3

Causes of excessive coning

  • Low rotor RPM = Loss of centrifugal force
  • High gross weight = More lift required
  • High “G” maneuvers = More lift required
  • Turbulence = Updrafts increase angle of attack, which increases coefficient of lift which increases lift
slide4

Centrifugal Force

Effects of excessive coning

  • Decreased rotor area and useful lift
  • Stress on blades and blade roots

Resultant or effective lifting area

Lift