blades 13 primarily in low pitch conditions the components of the propeller assembly embodiment herein described are fashioned from materials which are substantially resistant to rust and corrosion in marine environments for example stainless steel together the cylindrical segments 14 of the blade assemblies form a cylinder when the propeller assembly is in the maximum pitch position as shown in fig1 rotation of a splined drive shaft secured in the splined bore 12 causes rotation of the central hub 11 with its connected blade assemblies about the axis of rotation 10 in the direction shown by arrow 19 when the propeller is operated in its normal direction of operation centrifugal forces resulting from rotation of the propeller act on the blade assemblies at their center of mass causing the blade assemblies to pivot about their pivot points 16 and move outward away from the central hub 11 fig2 more clearly illustrates the pivotal movement of the blade assembly about pivot 16 from a maximum pitch position to a minimum pitch position as previously mentioned pivot 16 is a ball joint and therefore allows for rotational freedom about three mutually perpendicular axes positioned adjacent to both the leading edge 15 of the propeller blade and the leading edge 30 of the cylindrical segment 14 as shown the blade assembly pivots between its dashed minimum pitch position and its solid maximum pitch position about the pivot 16 the range of pitch adjustment may for example be from 11 to 22 inches pivotal movement of each blade assembly about its pivot 16 between minimum pitch and maximum pitch is controlled by two arms 20 21 namely a first arm 20 pivotally attached at a first outer pivot 24 to the cylindrical segment 14 of that assembly adjacent its trailing edge.