HomeCalculatorsSTAWAVE-2 Added Resistance in Waves

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

Hull particulars

Waterline length LwlmBeam BwlmDraft TmBlock coefficient Cb–

Wave + speed

Significant wave height H₁/₃mShip speedkn

Added resistance R_AW

50.3kN

Added effective power ΔP_E

362kW

Formula, assumptions, and limits

STAWAVE-2 closed-form for the mean added resistance in irregular head waves at design speed. Assumes head seas and displacement-type hull; under-reads by 20–40 % at oblique angles vs strip theory. Used in IMO MEPC.212(63) for the fw factor on EEDI.