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Online calculators for CG, speed, motors, gearing.

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Center of Gravity (CG) | Performance predictors | Aerodynamics


Martindale's Calculators On-Line Center
More calculators than you will ever need, in all kinds of different fields. Those of particular interest may be listed in the subcategories.
EngNet - Metric Conversion Chart
Just about any engineering unit conversion found here...
e-flight calculators (compilation) - RC Groups
Discussion e-flight calculators (compilation) Power Systems
Airfield Models - Formulas Used with Flying Model Aircraft
Useful formulas for model-aircraft builders. How to locate the Mean Aerodynamic Chord (MAC), determine the Wing Area, Wing Loading, Aspect Ratio and various other simple to calculate formulas.