Model-Ship Correlation Allowance ΔC_F

Hull-roughness correlation allowance ΔC_F per ITTC 1978 performance prediction - added to flat-plate C_F in ship extrapolation.

CorrelationITTC\u0394C_F

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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

\Delta C_F = 0.044 \left(\frac{k_s}{L}\right)^{1/3} + 0.000125

Symbol	Meaning	Unit
$k_s$	Hull roughness	µm
$L$	Waterline length	m

Source: ITTC 1978 Performance Prediction

Hull-roughness correlation allowance \u0394C_F per ITTC 1978 performance prediction - added to flat-plate C_F in ship extrapolation.