| 摘要 |
A safety control system for the prevention of undesired reactive thrust which may be produced from hydraulic jet turbines includes manually operated controls connected to the shutoff valve of a hydraulic jet venturi section and a switch operatively connected to the shutoff valve. This switch is closed when the shutoff valve closes the main propulsion opening. It is connected in series with the starter of the engine driving the jet turbine so that the engine can only be started when the main propulsion opening is closed. Further, controls are provided between the throttle of the engine and the shutoff valve controls to reduce the rotational driveshaft speed when the shutoff valve is closed.
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