Patent ID: 8702395
Filing Date: 2014-04-22
Classification: B63H

Abstract:
1. A hub fin device for improving the efficiency by reducing or eliminating hub vortex of a propeller, said hub fin device comprising: a propeller having a hub and a plurality of propeller blades extending radially outward from said hub, each of said plurality of propeller blades having an overall height, a trailing edge and a trailing edge region; and a plurality of fins with a separate fin located directly adjacent to said trailing edge in said trailing edge region of each of said plurality of propeller blades, each of said fins integral with or directly attached to and extending radially outward from said hub, each of said fins having a blade portion with a height; each of said propeller blades and each of said fins dimensioned such that a ratio of said height of said fin blade portion to said overall height of said propeller blade is between 0.15-0.35, inclusive.