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Which statements correctly describes (1) static stability and (2) dynamic stability in a helicopter?

  • A

    (1) After disturbed, the helicopter returns to the original position; (2) Oscillation reduces amplitude through equilibrium

  • B

    (1) After disturbed, the helicopter returns to the original position; (2) Oscillation increases amplitude through equilibrium

  • C

    (1) After disturbed, the helicopter does not return to the original position; (2) Oscillation reduces amplitude through equilibrium

  • D

    (1) After disturbed, the helicopter does not return to the original position; (2) Oscillation increases amplitude through equilibrium

In general, stability is the tendency of an object to return to its original condition (equilibrium), after it has been disturbed.

Static stability describes the immediate response of an object, when it is displaced from equilibrium and is concerned only with the initial tendency of an object to return to its original condition after a disturbance.

Static stability is measured by the force or moment per unit of displacement that acts to restore the object equilibrium. For example, when pendulum is held out to one side, it experiences a force which tries to return it to equilibrium, thus it is statically stable.

In the helicopter’s case, when during flight experiences a disturbance and it has the tendency to return to its original condition then it is said to have static stability.

Dynamic stability refers to the manner in which an object restores itself to equilibrium. It is measured by the time required for the object to return to its initial condition, after it has been displaced. The pendulum is dynamically stable. When released after being held to one side, it will immediately try to return to its lowest point, but will initially overshoot, swinging out to the other side. Eventually, the oscillations will die down (reduces amplitude) and the pendulum will settle at equilibrium.

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