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Old Nov 15, 2007, 02:00 PM
cp1
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Hannover, Germany
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Propeller Calculator

Today I have posted a propeller calculator on my website www.drivecalc.de. The application is meant for the advanced pilot and for those, who are eager to learn more about drive systems.

Helmut Schenk has written PropCalc years ago in Borland Pascal. It was my pleasure to port the software for Windows and Mac OS. Using impressive mathematical effort, the application computes the in-flight performance of propellers based on geometrical data and wind tunnel measurements of the airfoils.

Regards
Christian
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Old Nov 15, 2007, 03:13 PM
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Thanks cp1 for providing us with your nice work.
Well done.
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Old Nov 16, 2007, 11:56 AM
Boffin
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Victoria, BC, Canada
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Any more data?

The calculator is superb but the propeller database is limited. Does anyone else have windtunnel data that could be provided? I seem to remember JRB of Minnesota (whose real name escapes me at the moment) did some work.

Thanks Helmut,
Rick.
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Old Nov 23, 2007, 01:14 PM
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Christian, my friend and I have downloaded Prop Calc for Windows and would like to use it in designing some propellers for high altitude autonomous aircraft record attemps.

The current version seems to limit the air density function; Roh, to values one or greater. Is it possible to get a version where we can input smaller values (very much smaller!)

Dave Harding
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Old Nov 23, 2007, 05:06 PM
cp1
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Hi Dave, PM me your mail address and I will send you a special unlimited version.

Christian
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Old Nov 24, 2007, 01:56 AM
hul
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nice program, may help to kill a few myths.

What formulae are used?

Hans
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Old Nov 24, 2007, 04:01 AM
cp1
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Hans, I suspect you can read German. Helmut has explained the theory in Fortschrittsgrad&Co.

Christian
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Old Nov 24, 2007, 03:28 PM
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There is some published data on Graupner Aeronaut props. Check here;

http://www.aero-naut.de/prop/bilder/...iagrammCAM.jpg

http://www.aero-naut.de/prop/bilder/...ammCLASSIC.jpg


Dave
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Old Nov 25, 2007, 12:40 AM
hul
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Quote:
Originally Posted by Dave Harding
There is some published data on Graupner Aeronaut props.
those diagrams only give you static condition. Christians program calculates dynamic thrust and power consumption.
PS: Aeronaut is not Graupner.

Quote:
Originally Posted by cp1
Helmut has explained the theory in Fortschrittsgrad&Co.
thanks, Christian. The prop is split into little pieces of wing, each with different velocity, airfoil and angle of attack, drag and lift calculated, converted into torque and thrust and then added together.

Hans
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Last edited by hul; Nov 25, 2007 at 12:41 AM. Reason: added PS
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Old Sep 27, 2009, 06:33 AM
homo ludens modellisticus
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The Netherlands, GE, Nijmegen
Joined Feb 2001
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Discussion about prop constants used in e-flight calculators, a.o. with Bruce Abbott and the authors of WebOCalc ('flieslikeabeagle')and PeakEff ('mattay') :
http://www.rcgroups.com/forums/showt...0#post13207540

Vriendelijke groeten Ron
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