Volvo Penta SP Aquamatic Propellers offer increased blade area which make it most suitable for use with high horsepower engines and more efficient at higher revs. In a fast boat this does not only mean increased speed, it also means that a heavily loaded boat will plane more quickly and enjoy better fuel economy. The high speed propeller's excellent reversing characteristic also means faster and safer quayside maneuvering. . All Volvo Penta SP Propellers utilize the Rubber Hub Bushing System that provide excellent gripping force, and will keep the propeller from slipping.