Marine propulsion – Screw propeller
Patent
1995-12-21
1998-03-31
Avila, Stephen
Marine propulsion
Screw propeller
416147, B63H 114
Patent
active
057331561
ABSTRACT:
In a variable propeller for a boat, variable-diameter main blades and stationary subsidiary blades are mounted on a propeller boss in order to provide further enhanced low-speed driving property and high-speed and high-output performance. When the main blades are in closed positions in which the propeller diameter assumes a minimum value, the main and subsidiary blades are axially superposed on each other. When the main blades are in opened positions in which the propeller diameter assumes a maximum value, the main and subsidiary blades are arranged in a relation such that their blade surfaces are substantially in line with each other.
REFERENCES:
patent: 3082827 (1963-03-01), Rosen
patent: 3565544 (1971-02-01), Marshall
patent: 5073134 (1991-12-01), Muller et al.
Aihara Takao
Nakazato Ikuo
Takada Hideaki
Avila Stephen
Honda Giken Kogyo Kabushiki Kaisha
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