On Mon, 29 Mar 2004 08:59:59 -0700, Keith Hughes
wrote:
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.

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Point taken and understood. I was assuming a starting condition with
the rudder parallel to an established flow, and then turned at an
angle causing a deflection and small side force. Given the general
weakness of the flow and somewhat unfocused direction, it's quite
believable that an equilibrium could be reached. Until that happens
I'm still convinced that a small amount of deflection and force would
be produced, similar to what the good professor at MIT observed with
his fan.