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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.
Online Conversion - Convert just about anything to anything else
Lots of useful conversions here.
EngNet - Metric Conversion Chart
Just about any engineering unit conversion found here...
Onine conversion of weights and measures, metric conversion.
Here you can easily perform online conversions (e.g. metric conversions) for many measurement systems both commonly used like metric and U.S. Avoirdupois and quite exotic like Ancient Greek and Roman.
e-flight calculators (compilation) - RC Groups
Discussion e-flight calculators (compilation) Power Systems