Hydraulic propeller system

Claim 1

IN A HYDRAULIC PROPELLER SYSTEM, A VARIABLE PITCH PROPELLER HAVING HYDRAULIC OPERATING MEANS FOR ADJUSTING THE PITCH OF THE BLADES OF THE PROPELLER, A HYDRAULIC GOVERNOR HAVING A BODY HAVING A LOWER SECTION AND AN UPPER SECTION VALVING IN THE SAID UPPER SECTION, SAID VALVING SERVING TO CONTROL THE APPLICATION OF HYDRAULIC FLUID TO SAID OPERATING MEANS, SAID GOVERNOR HAVING FLYWEIGHTS BEING LOCATED IN SAID UPPER SECTION AND BEING ADJUSTABLE TO ADJUST THE SPEED OF ROTATION OF THE PROPELLER BY CONDITIONING OF SAID VALVING, A FIRST AND SECOND SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, MEANS FOR APPLYING FLUID FROM SAID FIRST SOURCE TO CONDITION SAID VALVING TO CAUSE THE APPLICATION OF FLUID FROM SAID FIRST SOURCE TO SAID OPERATING MEANS TO EFFECT FEATHERING OF THE PROPELLER, AND ADDITIONAL MEANS IN SAID LOWER SECTION FOR EFFECTING FEATHERING OF THE PROPELLER INDEPENDENTLY OF CONDITIONING OF THE VALVING, SAID LAST NAMED MEANS COMPRISING FLUID PASSAGE MEANS IN SAID LOWER SECTION CONNECTED TO SAID OPERATING MEANS, A SHUTTLE VALVE SLIDABLY MOUNTED IN A BORE FORMED IN SAID LOWER SECTION FOR AXIAL MOVEMENT BETWEEN FIRST AND SECOND POSITIONS TO CONTROL FLUID FLOW THROUGH SAID FLUID PASAGE MEANS, MEANS YIELDABLY URGING SAID SHUTTLE VALVE TO ITS FIRST POSITION, MEANS FOR APPLYING FLUID FROM SAID SOURCE TO SAID SHUTTLE VALVE TO MOVE SAID SHUTTLE VALVE FROM ITS FIRST TO ITS SECOND POSITION AGAINST THE FORCE OF THE YIELDABLE MEANS, ADDITIONAL FLUID PASSAGE MEANS IN SAID LOWER SECTION CONNECTED TO SECOND SOURCE OF FLUID UNDER PRESSURE, SAID SHUTTLE VALVE IN SAID SECOND POSITION PERMITTING INTERCOMMUNICATION BETWEEN SAID FIRST NAMED FLUID PASSAGE AND SAID ADDITONAL FLUID PASSAGE TO CAUSE THE APPLICATION OF FLUID SAID SECOND SOURCE TO SAID OPERATING MEANS TO EFFECT FEATHERING OF THE PROPELLER.