WATER JET PROPULSION DEVICE

PURPOSE:To enhance propulsion performance by increasing the thrust of a screw propeller and to prevent foreign objects from getting tangled around an engine output shaft. CONSTITUTION:An engine output shaft 2 connected to an engine is disposed inside a duct 1, and a shaft cover 4 provided with a plu...

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Bibliographic Details
Main Author SUNAYAMA YOSHIHIKO
Format Patent
LanguageEnglish
Published 06.09.1994
Edition5
Subjects
MARINE PROPULSION OR STEERING
PERFORMING OPERATIONS
RELATED EQUIPMENT
SHIPS OR OTHER WATERBORNE VESSELS
TRANSPORTING
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Summary:PURPOSE:To enhance propulsion performance by increasing the thrust of a screw propeller and to prevent foreign objects from getting tangled around an engine output shaft. CONSTITUTION:An engine output shaft 2 connected to an engine is disposed inside a duct 1, and a shaft cover 4 provided with a plurality of spiral fins 3 is secured to the outer peripheral portion of the engine output shaft 2 and an impeller 6 provided with a screw propeller 7 is disposed inside a housing 5 which is secured to the end portion of the duct 1. The shape of each spiral fin 3 on the outer peripheral portion of the shaft cover 4 is inverted with respect to the direction of rotation of the screw propeller 7 so that as the engine output shaft 2 is rotated a turning flow is generated in the direction opposite to that in which the screw propeller 7 is rotated.
Bibliography:Application Number: JP19930062758