The gain characteristics of a subsonic, pressure-controlled, proportional, fluid-jet amplifier are developed in relation to the control-port and receiver-design parameters. The analysis uses an assumed submerged-jet representation. Control ports are added and the control flows associated with various control-port positions are calculated. The control-port characteristics are presented in a series of design curves. The receiver characteristics are obtained also as a function of their inlet geometry. Optimum dimensions are found to maximize gain for pressure, flow, and power amplifiers. Linearity is discussed. The receiver characteristics are presented in a series of design curves. Complete amplifier characteristics are obtained by combining the control-port and receiver characteristics. An example calculation is shown.

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