is there any free software for propeller design?I mean that you give the parameter of the propeller, the software can give you a 3d propeller model, just like PropCAD, but PropCAD is so expensive.thanks in advance.
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branet: I think "expensive" is a relative things. I am a PHD candidate in China, my salary is RMB300, that is less than $40,Without knowing what you want to do, maby you could start with this. http://www.mh-aerotools.de/airfoils/javaprop.htm
(it's Java, click on "The Applet" in the left frame) Its not really what your looking for, but it is free, and it is propellers.
If your really into designing props, IMO PropCad is the way to go.
branet: I think "expensive" is a relative things. I am a PHD candidate in China, my salary is RMB300, that is less than $40,. If I were a PHD students in USA or Europe, I think i could afford it for $800.
Figgy: The hyperlinks you give is not available for me in China?