REMOTE AUTOMATED SYSTEM FOR PROPELLER PITCH CONTROL Russian patent published in 2008 - IPC B60V1/14 B64D31/06 

FIELD: transportation.

SUBSTANCE: system comprises propeller pitch indexing mechanism, control signals generator, logical elements, mismatch warning light, converters, actuating unit. System comprises two independent channels for propeller control - for forward and back vessel motion. The channels are hydraulically connected to actuating unit and electrically - to its limit switch. Each control channel contains channel follow-up rate monitoring unit, automatic channel switch and elements to compare actual and preset rates. Automatic switch contains memory devices which are connected to follow-up rate monitoring units, fault signaling units, switch and control channels locking device. Into hydraulic channels between actuating unit and throttling devices of both variable pitch propellers control channels hydraulic capacitances are introduced. Each of these capacitances has volume exceeding volume of actuating unit chamber and is fitted together with throttling devices in thermostable chamber.

EFFECT: reliability and dynamism enhancement of variable pitch propellers control for hoverships; elimination of operator faults in variable pitch propellers control under conditions of ambient air temperature sudden changes.

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