Hollenbach Resistance

Hollenbach's 1998 regression updated Holtrop-Mennen with modern hull data. Gives tighter predictions for single-screw and twin-screw ships, especially at Cb > 0.70. Common first pass for containerships and ro-pax where Holtrop drifts.

DesignResistance

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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

C_R = a_1 + a_2 F_n + a_3 F_n^2 + a_4 C_B + a_5 \left(\tfrac{L}{B}\right) + a_6 \left(\tfrac{B}{T}\right) + \ldots

Symbol	Meaning	Unit
$C_R$	Residual-resistance coefficient
$a_1..a_k$	Regression coefficients (full table 20+)
$F_n$	Froude number
$C_B$	Block coefficient
$L$	Waterline length	m
$B$	Beam	m
$T$	Draft	m
$C_F$	ITTC-57 friction coefficient
$S$	Wetted surface area	m²
$\rho$	Sea-water density	kg / m³
$V$	Ship speed	m / s
$R_T$	Total resistance	kN
$P_E$	Effective power	kW

Source: Hollenbach - *Estimating resistance and propulsion for single- and twin-screw ships* (STG, 1998); Molland, Turnock & Hudson - *Ship Resistance and Propulsion*

In short

Hollenbach 1998 resistance regression - residual and total resistance coefficients for single- and twin-screw ships, plus effective power.

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