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Old Jan 30, 2008, 12:26 PM
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marcioh's Avatar
Brazil, PR, Curitiba
Joined Dec 2006
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APC 4.1x4.1 prop constants

hi, I canīt find the prop constants for the APC 4.1x4.1 , want to see how a motor will behave with it using the following tool.
http://adamone.rchomepage.com/calc_motor.htm

I saw that even in the peakeff graphs the thrust for this prop is not calculated. Can someone explain me why?

Thanks
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Old Jan 15, 2009, 12:50 PM
flying low & slow
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Hi,

The APC 4.1x4.1 is added to the database of the calculator mentioned above.
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Old Jan 25, 2009, 06:14 PM
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Brazil, PR, Curitiba
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thank you very much!
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Old Jan 25, 2009, 07:25 PM
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Chattanooga, Tennessee, United States
Joined May 2003
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I just calculated from test stand data with a Grayson SuperSonic V2 motor and a 4.1x4.1 APC E, using Motocalc: Power Constant = 1.60, Thrust Constant = 1.053

That is not at all close to your estimates - why are we so far apart with the Power Constant especially? If I understand it correctly you have Kp = 1.0, Kt = 1.12
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