Admiralty constant

The admiralty constant C is an outdated benchmark for the efficiency of ship constructions. It was introduced in the second half of the 19th century, but has always been criticized as a rough and sometimes misleading estimate.

It is defined by the admiralty formula , therefore . It is P , the driving power , the displacement and v the speed of the ship. Often it is only given as a dimensionless number by inserting the power in horsepower , the displacement in tons and the speed in knots into the formula. This form of the admiralty constant then has the implicit unit of measurement . ${\displaystyle P={\frac {v^{3}\Delta ^{\frac {2}{3}}}{C}}}$ ${\displaystyle C={\frac {v^{3}\Delta ^{\frac {2}{3}}}{P}}}$ ${\displaystyle \Delta }$ ${\displaystyle {\frac {\mathrm {kn^{3}\mathrm {t} ^{\frac {2}{3}}} }{\mathrm {PS} }}}$

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• WH Atherton, AL Mellanby: Resistance and Power of Steamships. Technical Publishing Co, Manchester 1903, online .
• Volker Bertram, H. Schneekluth: Ship Design for Efficiency and Economy. 2nd edition. Butterworth-Heinemann, Oxford 1998, ISBN 0-7506-4133-9 .