Patent ID: 7001229
Filing Date: 2006-02-21
Classification: B63H

Abstract:
1. A propeller mechanism comprising a first propeller having a first elongated shaft having a forward end and an opposite rearward end, a first elongated helical blade affixed to said first elongated shaft, said first elongated helical blade having a first end closest to said forward end of said first elongated shaft and an opposite second end closest to said rearward end of said first elongated shaft, said first elongated helical blade extending radially outwardly from said first elongated shaft to terminate outwardly in a first elongated outer blade edge, said first outer blade edge of said first elongated helical blade curving in a first direction of rotation around said first elongated shaft as said first elongated helical blade extends rearwardly from said first end thereof toward said second end thereof to curve in such direction of rotation less than one full rotation around said first elongated shaft to thereupon terminate at said opposite second end of said first elongated blade, a second propeller in side-by side relationship to said first propeller, said second propeller having a second elongated shaft having a forward end and an opposite rearward end, a second elongated helical blade affixed to said second elongated shaft, said second elongated helical blade having a first end closest to said forward end of said second elongated shaft and an opposite second end closest to said rearward end of said second elongated shaft, said second elongated helical blade extending radially outwardly from said second elongated shaft to terminate outwardly in a second elongated outer blade edge, said outer blade edge of said second elongated helical blade curving in a second direction of rotation around said second elongated shaft as said second elongated helical blade extends rearwardly from said first end thereof toward said second end thereof to curve in such direction of rotation less than one full rotation around said second elongated shaft to thereupon terminate at said opposite second end of said second elongated helical blade, said second direction of rotation of said second elongated outer blade edge of said second elongated helical blade around said second elongated shaft being opposite from said first direction rotation of said first elongated outer blade edge of said first elongated helical blade around said first elongated shaft.