Is that rotor for an airplane/helicopter or a ventilator or something else?
If that is for airplane, do you need only the statical torque or also the
dynamic one?

Did you try xfoil by the way? That's only for foil analysis, but I think
there are some extensions for that for 3D plane, blade etc.

http://raphael.mit.edu/xfoil/
http://cobweb.ecn.purdue.edu/~aae333/XFOIL/Tutorial/Tutorial%20for%20XFoil.htm
http://pagesperso-orange.fr/scherrer/matthieu/english/miarexe.html
http://groups.yahoo.com/group/xfoil/

Tamas




On Tue, Apr 29, 2008 at 2:26 PM, Apptech <apptech@paradise.net.nz> wrote:

> > You probably have thought of this already but my
> > understanding is
> > that, to "first order", a flat plate is just an "airflow
> > deflector",
> > so that it gets maximum L/D at 45 deg AOA, and at that
> > point, L=D.
> > Furthermore, a stalled airfoil approximates a flat plate.
>
> 45 degrees AOA as max lift is as per sites quoted BUT
> stalling usually occurs well below that. Maybe not for flat
> plates. NASA sim I quoted allows you to model a flat plate
> well. Doesn't allow my "bent plate" rotors and it's not
> obvious how to handle them analytically and easily.
>
> With the flat-bent plate rotor machines the plate goes
> through 0-180 degrees of aoa and back again so analysis may
> be "difficult".
>
> I'm contemplating just measuring torque for a locked rotor
> at various aoa's and air speeds which should give me easy
> empirical
> results and then vary variables (blade to bent section
> ratio and bend angle) and see where that takes me.
>
>
>        Russell
>
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