PROPELLER PITCH REMOTE AUTOMATIC CONTROL SYSTEM Russian patent published in 2002 - IPC

FIELD: shipbuilding. SUBSTANCE: invention relates to control systems of variable-pitch propellers of hovercraft. System has propeller pitch position setter, control signal shaper, logic gates, mismatch signal lamp, converters and actuator. System includes also two independent propeller control channels, for ahead running and astern running of craft, connected by hydraulic lines to actuator, and by electric circuits, to limit switch of actuator. Each propeller control channel has follow-up rate monitoring unit, automatic channel selector switch and comparators of actual and preset speeds. Automatic selector switch has memories connected to follow-up rate monitoring unit, fault signaling unit, selector switching unit and control channel interlocks. EFFECT: improved reliability and dynamic of control of variable-pitch propellers when hovercraft runs ahead and astern. 4 cl, 1 dwg