Marine propulsion – Screw propeller
Patent
1996-05-22
1998-09-01
Avila, Stephen
Marine propulsion
Screw propeller
440 81, 416128, 416223R, B63H 510
Patent
active
058002235
ABSTRACT:
A marine propulsion device improves the handling characteristics and the responsiveness of the watercraft on which it is used. The propulsion device includes a pair of counter-rotating propellers. At least the blades of the front propeller each have a mean camber line in cross-section which has a generally constant radius of curvature. This blade shape reduces cavitations and permits the rear propeller to be mounted closer to the front propeller, and consequently closer to the steering axis of the outboard drive. As a result, steering torque is reduced. The blades of the rear propeller also are not more than thirty percent smaller than the blades of the front propeller, and the average pitches of the propellers do not differ by more than one to four percent. These blade configurations of the front and rear propellers improve the stability of the watercraft when turning, thereby reducing chine walk, as well as improve the responsiveness of the watercraft.
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Everything You Need to Know About Propellers, 3rd Edition, Mercury Marine, Brunswick Corp., 1984, Part No. 90-86144.
Iriono Yasushi
Sumino Yoshitsugu
Avila Stephen
Sanshin Kogyo Kabushiki Kaisha
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