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.Moto Calc will predict weight, current, voltage at the motor terminals, input power, output power, power loss, motor efficiency, motor RPM, power-loading, electrical efficiency, motor RPM, propeller or fan RPM, static thrust, pitch speed, and run time.
The Moto Wizard is described in great detail in its own section of this manual, so we won't repeat it all here. The Moto Wizard consists of a number of pages on which you answer some basic questions about your model, it's intended performance, information about where you fly, and any preferences you may have.
The pieces of information you need to supply are: If you already have a good idea of the power system components you want to use in your model, you may want to skip using the Moto Wizard and go straight to the Moto Calc Workbench. If you are unhappy with them (for example, suggestions involving a very large number of cells, or only brushless motors when you would prefer brushed), return to the Moto Wizard's option pages and narrow your preferences.
(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!
These five steps are described in more detail below.
If the motor you are using is not included in the database, Moto Calc will help you figure out its parameters from test data, catalog information, or from the specs of another similar motor.
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.
Finding an Item Selecting an Item Finding a Similar Item Deleting an Unwanted Item Printing a Database Table Exporting a Database Table Importing into a Database Table Updating a Database Table Finding the Maximum Efficiency Point of a Motor Gearing and Propping for Maximum Efficiency Gearing for Maximum Thrust Choosing an Alternate Motor Making Use of the Color Coding Frequently Asked Questions Moto Calc is a Simulator All Propellers are not Created Equal Motor Characteristics can Vary Static Thrust can be Misleading Consider the Pitch Speed Catalog Data can be Sloppy All Ducted Fans are not Created Equal Motor Temperature Estimates are Only a Guide Free 30-day Evaluation Why Register?
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.
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To reduce the amount of information you have to deal with, Moto Calc comes with a database of motors, cell types, gearboxes and propellers, speed controls, and filters.