B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
B63H—MARINE PROPULSION OR STEERING
B63H3/00—Propeller-blade pitch changing
B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
B63H3/081—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft
B—PERFORMING OPERATIONS; TRANSPORTING
B64—AIRCRAFT; AVIATION; COSMONAUTICS
B64C—AEROPLANES; HELICOPTERS
B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/30—Blade pitch-changing mechanisms
B64C11/38—Blade pitch-changing mechanisms fluid, e.g. hydraulic
B64C11/40—Blade pitch-changing mechanisms fluid, e.g. hydraulic automatic
B—PERFORMING OPERATIONS; TRANSPORTING
B64—AIRCRAFT; AVIATION; COSMONAUTICS
B64C—AEROPLANES; HELICOPTERS
B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/30—Blade pitch-changing mechanisms
B64C11/38—Blade pitch-changing mechanisms fluid, e.g. hydraulic
B64C11/42—Blade pitch-changing mechanisms fluid, e.g. hydraulic non-automatic