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Calculators

Online calculators for CG, speed, motors, gearing.

Links:

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...
e-flight calculators (compilation) - RC Groups
Discussion e-flight calculators (compilation) Power Systems