Schoenherr ATTC Friction Line

Alternative friction-resistance correlation (Schoenherr 1932 / ATTC) used by some model basins instead of ITTC-57. Implicit equation solved via Newton iteration.

ResistanceFriction

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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

\frac{1}{\sqrt{C_F}} = 4.13 \cdot \log_{10}(\text{Re} \cdot C_F)

Symbol	Meaning	Unit
$Re$	Reynolds number
$C_F$	Frictional resistance coefficient

Source: Schoenherr (1932) - Resistance of flat surfaces moving through a fluid; ITTC - Recommended procedure 7.5-02-02-01

In short

Alternative friction-resistance correlation (Schoenherr 1932 / ATTC) used by some model basins instead of ITTC-57.

Learn the theory Ship resistance and powering