Lecture 2 Notes Static Stability

# Lecture 2 Notes Static Stability - Lecture 2 Notes Static...

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Unformatted text preview: Lecture 2 Notes: Static Stability Static Stability • Static stability is all about the initial tendency of a body to return to its equilibrium state after being disturbed • To have a statically stable equilibrium point, the vehicle must develop a restoring force/ moment to bring it back to the eq. condition • Later onwewill alsodeal withdynamic stability, whichisconcerned with the time history of the motion after the disturbance – Can be SS but not DS, but to be DS, must be SS ⇒ SS is a necessary, but not su ﬃ cient condition for DS • To investigate the static stability of an aircraft, can analyze response to a disturbance in the angle of attack – At eq. pt., expect moment about c.g. to be zero C M cg = 0 – If then perturb α up, need a restoring moment that pushes nose back down (negative) • Classic analysis: – Eq at point B – A/ C 1 is statically stable • Conditions for static stability C M = 0; ∂C M ∂α ≡ C M α < 0 note that this requires C M | α 0...
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• Fall '14
• JonathanP.How
• Aerodynamics, Trigraph, Lift, CMT, Static Stability, xcg − xac

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