Vessel provided with at least one water jet propulsion unit
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United States of America Patent
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May 29, 1990
Grant Date -
N/A
app pub date -
Nov 16, 1988
filing date -
Nov 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Vessel provided with at least one water jet propulsion unit consisting of a casing containing, between an intake (3) tangential to the hull (2) and a rear water outlet (4), a duct (5) upstream of the propulsion device, an impeller (6), fixed flow-correction guide vanes (7) and a tail cone (8) carried by the blades which with the casing (9) form the tail pipe (10). The cross section of the tail pipe (10) varies but within narrow limits between the vanes (7) and the outlet (4) by virtue of a number of gas injection slots situated in the area of the trailing edges of the vanes (7) and connected by a circuit to a supply of compressed gas (16). The gas supply circuit includes an external annular chamber (14) formed within the casing and the shroud surrounding the vanes (7) and connected to the injection slots (25, 26, 29). Of application to vessels requiring very high thrusts.
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