THE SAIL PROP IS MANUFACTURED SO THAT THE TORQUE OF THE DRIVE POSITIONS THE BLADES INTO THE PREADJUSTED PITCH POSITION. THE PROPELLER HUB AND THE SHAFT ARE CONNECTED BY LEVEL GEARING WHICH GARANTEES THE SYNCHRONIZED TURNING OF THE BLADES. A STOP INSIDE THE PROPELLER HUB REGULATES THE PITCH POSITION OF THE PROPELLER. ASK US FOR OUR REFERENCE.