Marine propulsion – Helical screw
Patent
1994-07-15
1995-05-02
Swinehart, Edwin L.
Marine propulsion
Helical screw
416176, B63H 126
Patent
active
054114225
ABSTRACT:
A propeller is presented which comprises a one piece blade that spirals out from an angular solid hub portion in smooth transition as a continuous screw spiral (or helix). Throughout its length, the spiral screw portion has an open center, (i.e., axial void) which when rotating is filled totally by water both inside the center void and in all spaces between the spiral blades. The spirals of the spiral screw portion are angled so that the pitch angle has a concave face or pushing surface which results in water trapped within the center and between the pitch faces being forced to pulse and thus be thrown back with great force from the end of the spiral screw.
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