_:vb7049592	<http://www.w3.org/1999/02/22-rdf-syntax-ns#value>	"(engineering) The motion of the centre of resistance of the float of a paddle wheel, or the blade of an oar, through the water horizontally, or the difference between a vessel's actual speed and the speed it would have if the propelling instrument acted upon a solid; also, the velocity, relatively to still water, of the backward current of water produced by the propeller."@en .