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Rubber Motor Turns Equation & Density Calculator
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** Download this to use. It may not work unless you do.
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Motor Length (inches)Number of StrandsRubber Motor Weight (grams)O-Ring Weight (grams)
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1521.5340.09
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Rubber Density Calculation (g/in)0.0473
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Rubber Width Calculation (in.)0.0712
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Breaking TurnsBreaking Winder Turns at 15:1Breaking Winder Turns at 20:1
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2,256150113
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80% of Breaking12090.4
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85% of Breaking127.596.05
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90% of Breaking135101.7
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* Enter data in green highlighted cells only
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** To use this calculator, download it to
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your PC. Do not use it here.
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*** Created by: Brian Turnbull for the
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National Free Flight Society
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