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

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