|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||440/67 ; 440/72|
|발명자 / 주소|
|인용정보||피인용 횟수 : 7 인용 특허 : 9|
A low-aspect ratio propeller system is provided with a multiple ring structure formed with a plurality of circular or non-circular, annular, narrow equivalent air foil rings which are held by rails in a predetermined relationship with the propeller blades. The upstream ring is located downstream from the tip vortex of the propeller within the axial span of the propeller. One or more additional downstream-located rings are used so as to provide at least one annular multiple ring-defined pump aperture through which peripheral vortices generated by the prop...
In a boat engine driving a rotating shaft for moving the boat through water comprising: an axial flow propeller for rotation about an axis and having a plurality of radially-extending blades; said blades being oriented with an axial span selected to move water in a downstream direction along the axis during propeller rotation; a ring cage structure formed of a plurality of axially-spaced water flow enhancing rings located around the axis, with a plurality of said water flow enhancing rings being axially-located around the blades within their axial spans;...