Pine Pienaar wrote:

Hi

Does anyone have a copy of Prop Optimizer by Bates that can run me a couple
of design's.
I'm trying to model a 2 and 3 blade prop through Rhino 3D firstly to learn
it and secondly because I heard that the most difficult part of modeling a
prop is to get the hub area right.

I would like to use correct figures as I'm going to make a sample prop to
run on a test stand.

Please let me know what is needed for input data.

Many Thanks

Pine Pienaar
pine@cpro.co.za
Lancair 360 #664

vjaqua wrote:

Pine - The center 20 percent radius portion of the propeller has almost no impact
on performance, and in many cases is almost, if not completely, encompassed by
the spinner. My programs essentially ignore this area, especially since true
helical pitch would usually result in very steep angles for these points. I can
give you a starting point prop configuration with data on engine shaft
horsepower, prop shaft rpm at that power,and a realistic value for airplane top
speed at that power. If you have some diameter limitations based on gear
clearance, that can be considered also. in most cases optimum performance is
realized with the maximum diameter allowed by tip speed and clearance.
Vance

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