Variable propeller for boat

Details Variable propeller for boat Variable propeller for boat

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.

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