What Can MotoCalc Do For You?
Need help choosing a power system for your electric RC model airplane?
MotoCalc will tell you everything you need to know: Amps, Volts, Watts, RPM, Thrust, Rate of Climb, and much more!
Ask the MotoWizard to suggest a set-up for your model. Use the MotoCalc Workbench to calculate detailed performance predictions for different variations. Ask for a MotOpinion to find out what will work, and what won't. And when you've found the right power system, MotoCalc's Wiring Wizard will show you how to hook it all up.

LINK : http://www.motocalc.com/