Nomoto K - Turning-Rate Gain

Nomoto first-order K index from turning-circle steady-state rate of turn - a compact ship-handling metric used in IMO zig-zag and turning tests.

NomotoManoeuvringK index

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

K = \dot\psi_{ss} / \delta_R

Symbol	Meaning	Unit
$\dot\psi_{ss}$	Steady yaw rate	rad/s
$\delta_R$	Applied rudder angle	rad

Source: Nomoto K. - JZS 1957

Nomoto first-order K index from turning-circle steady-state rate of turn - a compact ship-handling metric used in IMO zig-zag and turning tests.