Holtrop - Form Factor 1+k1

Form factor 1+k1 for frictional-resistance correction per Holtrop-Mennen regression - the first step in predicting still-water resistance from hull geometry.

HoltropForm factorResistance

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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

1 + k_1 = 0.93 + 0.487118 \cdot c_{14} \cdot (B/L)^{1.06806} \cdot (0.95-C_P)^{-0.521448}

Symbol	Meaning	Unit
$C_P$	Prismatic coefficient
$B/L$	Breadth-length ratio

Source: Holtrop J. - ISP 1984

In short

Form factor 1+k1 for frictional-resistance correction per Holtrop-Mennen regression - the first step in predicting still-water resistance from hull geometry.

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