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 example, the database contains over 3100 motors (including the Actro, Astro, Aveox, AXI, Graupner, Hacker, Jeti, Kontronik, Kyosho, Max Cim, Plettenberg, Scorpion, and Turnigy lines), and 250 different cell types.
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.
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.
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.
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.
Using color coding, the table will also indicate the model's predicted stalling speed, optimal flying speed, and hands-off flying speed (these speeds are generally at less than full throttle). button at the bottom of the in-flight analysis to display the Mot Opinion page, which will give you a plane-English description of how your plane will fly, and any potential problems with the selected power system.
Based on the information in the in-flight analysis and Mot Opinion report, you may wish to revise or refine your power system.
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.
By producing a table of predictions, Moto Calc lets you determine the optimum propeller size and/or gear ratio for your particular application.
One way to do this is to return to the Moto Wizard (select Moto Wizard...