[Jshwaa]

Right, he's runnin' 4 li-ions in series on a speed checker. Your nitro truck is probably actually clocking 45 on the ground. Huge difference in actual power there. The cells and motor are set up to give that xmod super high RPM's, but when that thing is forced to accelerate the mass of the xmod(torque), it will draw waaaaay more current than when it was rolling on the speed checker. Then you'll see the true colors of the cells, the FET's, and the motors ability to output power. The speed checker only shows you half of the equation.

Speed x Torque = Power(in physics/dc motors)

Voltage x Current = Power(in electronics/dc motors)

Voltage = Speed(in dc motors)

Current = Torque(in dc motors)

So it goes to show that if you only have speed checker data, you're still not evaluating the power of your xmod. You only know how fast it goes under no load whatsoever(except for xmod's drive-train).

So to analogize a "45mph xmod" as being as powerful as a "45mph nitro truck" is poor at best. Nitro motors have loads of torque; torque to push the weight of the R/C throughout its whole RPM range, and have torque to spare on throwing some dirt. That's good power there.