Quasi-Propulsive Coefficient η_D

η_D = η_O · η_H · η_R - the efficiency of energy transmission from delivered power to effective (towing) power.

Propulsion

Loading calculator…

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

\eta_D = \eta_O \cdot \eta_H \cdot \eta_R

Symbol	Meaning	Unit
$\eta_O$	Open-water efficiency
$\eta_H$	Hull efficiency
$\eta_R$	Relative rotative efficiency
$\eta_D$	Quasi-propulsive coefficient

Source: SNAME PNA Vol II

\u03b7_D = \u03b7_O \u00b7 \u03b7_H \u00b7 \u03b7_R - the efficiency of energy transmission from delivered power to effective (towing) power.