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Old 01-01-2006, 10:01 AM   #1
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Default RC DYNO QUESTION

Hi,

Does anyone have the dimensions and weight of the flywheel used for their motor dyno?
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Old 01-01-2006, 11:40 AM   #2
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For what dyno?.

The Robi and Fantom have different dimensions and weights.

Just say which one and I will give you the figures.

Isaac
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Old 01-01-2006, 02:26 PM   #3
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The Robi would be great, cheers
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Old 01-02-2006, 05:01 PM   #4
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BUMP
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Old 01-03-2006, 05:58 PM   #5
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Any help?
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Old 01-03-2006, 06:10 PM   #6
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Here is some data from the Robitronic Manual.

"In addition to that of the flywheel, the moment of inertia of the motor armature must also be considered for a measurement. The value above is an average of various commonly available armatures. The value should not be changed initially, but can be adapted for special applications. The factory setting is 4.20 x 10e-6 kgm2 "

The factory flywheel has a moment of Inertia of 45 x 10e-6 kgm2

This is calculated from the following formula
Inertia = 1/2 mass x Radius^2
I don't have the flywheel in hand to measure it. There is a robitronic thread. If you ask there for the radius and width you could calculate the mass with the formula. Here is a picture of the instrument if you just want a rough estimate.

You need to convert dimensions to meters and will get a mass in kilograms if you use the above formula.

If you would like more accurate power measurments on P2K type stock motors then you can use 3.0 x 10e-6 kgm2 for the inputed Moment of Inertia of the armature. Most people don't make this change.


Photo courtesy of Robert Schachuber.
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RC DYNO QUESTION-robitronic-dyno.jpg  

Last edited by John Stranahan; 01-03-2006 at 06:30 PM.
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Old 01-04-2006, 08:53 AM   #7
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Here is a link to a thread where there are some guys that own the Robitronic Dyno. They could measure the diameter with calipers. You or I could calculate the mass. They may not have a scale, but probably have a caliper.

http://www.rctech.net/forum/showthread.php?t=95842
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Old 01-04-2006, 09:13 AM   #8
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Quote:
Originally Posted by browncolin
Any help?
PM EddieO he is a USA importer for that Dyno.
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