Moto Calc's graphing facility can plot any two parameters against any other (for example, lift and drag vs. If you have particular requirements, such as a minimum run time, maximum current, or maximum power loss (which is dissipated as heat), you can use Moto Calc's filter facility to filter out the unacceptable combinations.
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.
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.
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!The last line of the summary, labeled "Stats", summarizes the predicted performance of the model.Below this you will see a table of predictions at different airspeeds, estimating things like current consumption, input and output power, and so on.After a few iterations, you should have narrowed down your choices to a few power systems suitable for your model and your requirements.At this point, it's time to install some equipment, and go flying.This will fill in the Moto Calc Workbench window with settings corresponding to the selected suggestion.