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Which statement is correct regarding the static stability?
  • A
    Most difficult to achieve, in the yawing plane, in forward flight.
  • B
    The ability of an aircraft to climb after being disturbed.
  • C
    The tendency of an aircraft to return to its original condition of flight after a disturbance.
  • D
    The ability of an aircraft to turn about its axes.

Refer to figure.
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.

Static Stability has three categories:

  • Positive, when an object returns to its initial position.
  • Neutral, when a force is applied to an object, it moves and comes to a halt.
  • Negative, when an object never returns to its initial position.

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