> 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?

"Wind turbine".
The static torque and dynamic torque are, in my present 
assessment, identical.
ie if I have a rotor with air passing over it at a certain 
rate and from a certain angle in a steady state then this 
will (hopefully) closefully enough approximate this 
condition when it transiently occurs during rotor rotation.
ie (again) I'm saying that I am just changing the frame of 
reference. Moving air and moving rotor or moving air at 
another velocity and locked rotor. For a mainly lift based 
machine this is difficult as tip to wind speed is high 
(typically 3:1 - 6:1 range and can be 12:1+) but for a drag 
based machine tip speed i <= wind speed. I think the 
flat-bent plate machines are mainly drag based but have a 
lift element but by simply measuring tip speed in real world 
unloaded use this will become evident.

> 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.

Thanks.
Haven't done more than play as yet.

> 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/


        Russell

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