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When the stick force required to achieve a load factor of 3 from steady straight and level trimmed flight is 100 N, the value of the manoeuvre stability of that aeroplane is:
  • A
    25 N/g.
  • B
    75 N/g.
  • C
    50 N/g.
  • D
    33 N/g.
Stick force per g can be defined by:
Stickforceperg(N/g)=(Stickforce(N))/(loadfactor(g))
In this example, the maneuver stability of the airplane if unknown, and the exercise asks us to find it by considering that to increase the load factor from straight and level flight (n = 1g) to n = 3g (which is the same as increasing the load factor by n = 2g [3g – 1g]), a stick force of 100 N is required
Therefore:

Stickforceperg(N/g)=(100(N))/((3g−1g))

Stickforceperg(N/g)=100/2

Stickforceperg(N/g)=50N/g

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