Another nice prop program (as well as an electric motor program). Look at the bottom of the page for a the prop program. What I like about this particular program is that you can fix a rpm and the look at power and torque needs as the flight speed varies.http://www.drivecalc.de/Another bonus is that there are both Windows, Mac, and Linux versions.Here is a link to some calculations I did for various prop parameters (pitch, diameter, # blades...) which I originally posted in the Electric forum--where the real propeller heads lurk!http://stunthanger.com/smf/index.php?topic=7574.
That's a very useful program - in fact, in about 30 seconds I proved the point that I spent about half a week and a dyno and thrust stand test trying to convince Leonard Neumann (i.e. 4" pitch has a steeper thrust/velocity curve and a lot more static thrust than 6" pitch, when set to the level flight speed. I also discovered that my *really cheesy* prop simulation was pretty darn close and gave decent results/ Brett