Helicopter rotor construction

Claim 1

A ROTARY WING AIRCRAFT COMPRISING A ROTATABLE ROTOR, MEANS FOR ROTATING SAID ROTOR, A PLURALITY OF BLADES PIVOTALLY MOUNTED ON SAID ROTOR AT INDIVIDUALLY CIRCUMFERENTIALLY SPACED LOCATIONS AROUND THE PERIPHERY OF SAID ROTOR FOR PIVOTAL MOVEMENT ABOUT LEAD-LAG AXES SUBSTANTIALLY PARALLEL TO THE AXIS OF ROTATION OF SAID ROTOR FOR PIVOTAL LEAD-LAG MOVEMENT OF THE BLADES IN THE PLANE OF ROTATION, INCLUDING PUMP MEANS CARRIED BY SAID ROTOR, AN ACTUATING CYLINDER CARRIED BY SAID ROTOR FOR EACH BLADE, A PISTON SLIDABLE IN SAID ACTUATING CYLINDER, AND SLIDE VALVE CONTROL MEANS CONNECTED BETWEEN SAID PUMP MEANS AND SAID ACTUATING CYLINDER FOR SUPPLYING FLUID UNDER PRESSURE TO SAID ACTUATING CYLINDER FOR DISPLACING THE PISTON THEREIN TO MOVE SAID BLADES AT PREDETERMINED LOCATIONS OF ROTATION OF SAID ROTOR HEAD, SAID SLIDE VALVE MEANS PERMITTING THE PISTON IN SAID ACTUATING CYLINDER TO BE MOVED FREELY AT PREDETERMINED POSITIONS OF SAID ROTOR HEAD.