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Stability Criterion - Coggle Diagram
Stability Criterion
Sway
Ship with acceleration \( +\dot{v} \)
Inertial reaction \(-Y\)
\(Y=-\dot{v} \)
Yaw
Bow and Stern Counterpose
Situations
If bow dominates
Usually, \(N_v\) negative
If Bow and Stern Equal effect
\(N_v \) =0
If stern dominates
Usually, \(N_v\) positive
\(\sigma\) stability
not speed dependent
at low and moderate Fr numbers
So
Ship has controls-fixed straight-line stability low speed
will have at higher speeds
