Marine propulsion – Jet drive – Direction control for fluid jet
Patent
1992-12-21
1993-10-26
Sotelo, Jesus D.
Marine propulsion
Jet drive
Direction control for fluid jet
23926537, B63H 11107
Patent
active
052560902
ABSTRACT:
An accessory device that produces a variable-aperture orifice in the outlet pipe of conventional water-jet nozzles. In one embodiment, the attachment is mounted on the exterior of the outlet pipe; in another, it is installed as an insert inside the outlet pipe. The device comprises two opposite, substantially semi-cylindrical shells slidably coupled along their longitudinal edges and hingedly connected at one end to form a cylindrical structure which is capable of deformation at the other, free end to produce a variable cross-section. The aperture of the structure at the hinged end is sized to fit tightly with the size of the nozzle's outlet pipe, while the cross-section at the free end may be progressively reduced by clamping the two shells together. A clamping mechanism, such as a hydraulic bladder or a cable-driven clamp, is mounted around the free end and is used to reduce its cross-sectional size during operation of the watercraft. When the clamping mechanism is released, the shells are pushed open by the operating pressure of the water jet through the nozzle.
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patent: 4708671 (1987-11-01), Watanabe
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patent: 5049096 (1991-09-01), Henn
patent: 5062815 (1991-11-01), Kobayashi
patent: 5067918 (1991-11-01), Kobayashi
Durando Antonio R.
Sotelo Jesus D.
Weiss Harry M.
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