Equilibrium About an Axis

Equilibrium About an Axis

The aerodynamic moment coefficient Cm, o is defined as

If the profile is attached to a vertical axis located at x — 0 (nose of profile), the equation of equilibrium that will give the equilibrium angle of attack aeq is given by the equation of the moment coefficient

n d

Cm, o (aeq) = 0 —— 2 aeq + 4^

Fig. 15.1 Equilibrium position for the profile

Подпись: z c aeq is found to be

d

aeq = —4 = —0.08

c

See Fig. 15.1.

The equilibrium is stable because ‘ЩОг < 0.

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