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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).
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.
(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!
How to Register Registering the CD Version Registering the Evaluation Version If You Can't Print the Registration Form If You Don't Want to Register If You Lose Your Registration Using Moto Calc on More than One Computer Moto Calc is a program for predicting the performance of an electric model aircraft power system, based on the characteristics of the motor, battery, gearbox, propeller or ducted fan, and speed control.
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.
You can then use the rest of Moto Calc to investigate one or more of the suggestions in detail, and then use Moto Calc's Mot Opinion feature to get a plain-English analysis telling you how the power system, and your plane, will perform.
If you are a bit more experienced, and know some of the components you want to use to power your model (for example, a particular motor or battery), you can tell the Moto Wizard this and it will try to choose a suitable power system using those components.