ElectriCalc Version 2.2: An easy to use program with Windows display on your PC. Enter the size and weight of your airplane. Pick a motor from Ecalc’s database or add your own motor specs, select the number and type of battery cells, add a gearbox if you want, then a propeller. SEE instantly how well the combination will FLY! Change any value and SEE the results of the change in the performance figures. Thrust, rate of climb, current flow (will your 30 Amp motor controller be aedquate?), airspeed, efficiency, time of the motor run. Reduce the "throttle" setting to see how much power you can save. Ecalc is the answer to an electric flyer’s questions. Program comes on CD Rom and works with Windows 95 or later operating systems.