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.
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.
Printing This Manual If you prefer a printed version of this manual, we suggested printing the Adobe PDF version, which can be found on the Moto Calc CD (as of version 8.03) in the file "Moto Calc.pdf".
A copy can also be found on the Moto Calc web site at If you don't wish to print it on your own printer, it can be printed at most copy shops.
At this point, you can modify any of the parameters that you wish.
For example, if the Moto Wizard is suggesting a 4:1 gearbox and 12x8 propeller, but you know you can only obtain a 3.7:1 gearbox, change the gear ratio (and perhaps decrease the propeller size slightly).
You may also want to specify ranges for some parameters (for example, if the Moto Wizard suggested 14 cells, you might want to try 12 to 16 cells). from the Project menu, type in a name for your project, and click OK. button to generate an in-flight analysis (if you specified any ranges in step 2 above, you will get a static analysis, from which you can pick one result and click the In-flight... A summary of the project (motor, battery, speed control, airframe, etc.) appears at the top of the analysis.
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.