Effective mean velocity (EMV) and effective mean pitch (EMP) based on a common definition

Abstract

A definition is given of the effective mean velocity (EMV) in model propulsion test, being simultaneously the definition of effective mean pitch (EMP). In this way it is possibile to replace the radial pitch distribution of a SB-propeller in behind condition by a constant pitch of a SBmod propeller in an uni from velocity field with a constant velocity which is the effective mean velocity univocally determined, independent of the averaging criteria (thrust, torque, or power identity).