Guiding Means for Self-Propelled Torpedoes.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
This invention is based on the principle that certain characteristics of the wake of a moving vessel effect the motional impedance of an electroacoustic transducer to produce a fluctuation of impedance about one percent of the average value of transducer impedance in clear water. Theoretical and experimental studies made in the development of this invention indicated that the bubble content of the wake of a moving vessel is sufficient to produce a reduction in the specific acoustic resistance of the medium which appreciably changes the electrical impedance of a resonant electroacoustic transducer andor that the very near approach or actual contact of one or more bubbles with the face of an electroacoustic transducer has substantially the same effect on its motional impedance circle and may be used as the actuating agent in a torpedo-borne wake-sensing and control system up to speeds at least as high as 45 knots.