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PWM controls motor speeds on brushed motors. ESC's are used for brushless motors. They're two very different technologies. PWM stands for pulse widt modulation. The power to the motor is modulated by turning the power on full and turning it off at averyhigh frequency. The length of time the...

The amount of energy collected from any of these ideas would be a small fraction of the power needed to keep the quad aloft. While quads are great fun they are energy hogs compared to just about any other way to get into the air except traveling at really high speeds. All the more impressive for...

You guys are right but let me explain this another way. If you try to start your car with too small a battery, to the battery the circuit looks like a short. It can't supply the necessary amps and the voltage across the terminals will drop sharply. In effect the battery's resistance to flow...