See: [[#pitch_effective|Pitch, effective]]
===== Efficiency, mechanical =====
(//η//<sub>M</sub>)[-]\\
The r... I</sub> is the indicated power (which see).
===== Efficiency, propeller, behind hull =====
(//η//<sub>B</sub>)... elative rotative efficiencies respectively.
===== Efficiency, propeller, open water =====
(//η//<sub>O</sub>)[... r and //n// the rate of propeller rotation.
===== Efficiency, quasi-propulsive or quasi-propulsive coefficient
or_ship-model_for_propul-sive_or_quasi-propulsive_efficiency|correlation factor, ship-model, for propul-sive or quasi-propulsive efficiency]] - [[structured_dictionary:performance#course_ma