STAWAVE-2 Added Resistance in Waves

ITTC STAWAVE-2 simplified method for added resistance in regular waves. The standard fallback when full strip-theory results are unavailable, and the basis for EEXI/EEDI weather factor fw.

DesignWavesITTC

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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

R_{AW} = \tfrac{1}{16} \rho g H_{1/3}^2 B \sqrt{\tfrac{B}{L}}

Symbol	Meaning	Unit
$R_{AW}$	Mean added resistance in irregular waves	kN
$\rho$	Sea-water density	kg / m³
$g$	Gravitational acceleration	m / s²
$H_{1/3}$	Significant wave height	m
$B$	Waterline beam	m
$L$	Waterline length	m

Source: ITTC - *Recommended Procedures 7.5-02-07-02.1*; IMO Resolution MEPC.212(63) - EEDI weather factor $f_w$

In short

ITTC STAWAVE-2 simplified method for added resistance in head seas - the basis for EEDI/EEXI weather factor fw.

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