Froude Number - Hull Speed Regime

Contents

Froude number Fn = V/√(g·L) - the dimensionless speed index that determines whether a hull is in displacement, semi-displacement or planing regime.

Formula

$$ F_n = \frac{V}{\sqrt{g \cdot L}} $$

Symbol	Meaning	Unit	Source
$V$	Speed through water	m/s	log
$L$	Waterline length	m	hydrostatic table