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And if you don't know the aerodynamic characteristics of your plane, Moto Calc's lift and drag coefficient estimator will make short work of determining them.If you are a newcomer to electric flight, Moto Calc's Moto Wizard will ask you a few simple questions about your model and your preferences (such as brand of motor), and will then make suggestions as to the ideal power system.
You can specify a range for the number of cells, gear ratio, propeller diameter, and propeller pitch, and Moto Calc will produce a table of predictions for each combination.
Alternatively, you might just slightly revise the current suggestion by making changes in the Moto Calc Workbench window, perhaps trying different propeller sizes, more or fewer cells, or a different gear ratio (step 2).
Or, if you had specified any ranges in step 2, you can select a different result from the static analysis and generate a new in-flight analysis (step 3).
They may ask for proof that you have the right to print it, in which case you can refer them to this sentence in the PDF file: You are hereby granted permission to print a single copy of the PDF version of this document for personal use. This brief tutorial assumes that you have a model that you are intending to power with an electric motor (or more than one), whether that be a designed-for-electric model, or a conversion of a glow model.
(For a more in-depth tutorial, please visit The following is an overview of the steps that will get you well on your way to using Moto Calc to help choose a power system for your model: Based on the results above, either go back to step 1 and select a different suggestion, return to step 2 and modify some of the suggested components, or install the recommended power system in your plane and go fly!