Ducted propellers

Details Ducted propellers Ducted propellers

B - Operations, Transporting

63

H

115/22

B63H 5/14 (2006.01) B63H 25/48 (2006.01)

Patent

CA 1036873

ABSTRACT A ducted propeller assembly which operates by detaching the boundary layer flow and hence the propeller wake from one or other side of that region of the propeller duct downstream of the propeller. This deflects the propeller wake horizontally and thereby provides a sideways force and steering moment on the ship on which the assembly is mounted. Embodiments are described in which the boundary flow is detached by introducing secondary flows through apertures in the duct walls or by introducing a mechanical obstruction into the boundary layer flow at one or other side of the propeller wake. The assembly can also be operated with the propeller stationary to act as a side-thruster unit. An apparatus for use with a submersible is also described in which the control means is operable to deflect the propeller wake vertically, horizontally, or in directions lying between the vertical and the horizontal thereby to provide a corresponding steering force on the submersible.

237648

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