From: lifedata{at}vol.com
To: "Orion105" ,
Reply-To: lifedata{at}vol.com



> It seems to me that resistance to twisting is proportional to the
>width of the vane

Take a look at spokes in a bicycle wheel.  The oppositional arrangement of
the spokes at the hub gives control over some pretty hefty torques. The
width of the "blade" set by the width of the hub controls side
thrust, while connecting at the outer end at zero width.

Jim L

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