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push vs pull vis a vis rudders
nice, Keith.
Wayne.B wrote: Take a look at flow patterns through props some time. You're assuming that all the flow past the rudder (when on the suction side) is parallel to the keel (center) line, as it *basically* is on the discharge side. The intake side of the prop, however, has a cone-shaped intake pattern, with the prop at the apex. If the rudder is at an angle to the centerline, flow will take the path of least resistance, and to the extent that there is impact pressure on the rudder side with the highest aspect ratio, this will just cause disproportionate flow around the other side, increasing impact pressure on that side, until an equilibrium is reached. Once past the rudder, the flow resumes its 'along the centerline' flow, so there is no net deflection, and all 'thrust' is parallel to the centerline. Keith Hughes If flow deflection takes place (rudder at angle to flow), a force is exerted. Old news to everyone, Nobel prize not likely. |
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