My BL Revo project

[coolhandcountry]

Well if you think about it. If it takes say 50 watts of power to get the truck to move. With more voltage it will take less amps to move the truck. 12 cells it may wheelie 14 cells it will do a back flip.

[BrianG]

Originally Posted by coolhandcountry

Well if you think about it. If it takes say 50 watts of power to get the truck to move. With more voltage it will take less amps to move the truck. 12 cells it may wheelie 14 cells it will do a back flip.

If what you say is true, then it is a function of power, not voltage or current individually. Meaning, for a given power, as voltage goes up, current goes down and vice-versa. In order for that to happen, the motor resistance (actually impedance) must change. Generally speaking, when you have a certain voltage applied to a fixed load, which produces a current. If voltage goes up, current goes up, and so does power. What I thought would happen is that at 12cells it would wheelie and 14cells it would flip (like you said) but because the higher voltage generated a proportionally higher current (and higher power). Following that thought, 12 cells should draw less current and run longer.

It could be the fact that I'm using the throttle more aggressively at 12 cells to make up for the loss like you said. The more I think about it, it seems to have more to do with the three-phase AC inductive reactance coupled with the pulsewidth and frequency of the signal. Maybe it's time to drag out some of my old electronics books that deal with AC theory.

So, what cell count would give me the best runtime? 16 cells? 18 cells? Or stick with 14? Of course I'd have to reduce my throttle EPA even further if I went UP in cell count!

By the way, I'm not intending to argue, I'm just trying to get it straight in my head.

[Sylvester]

Id say stay 14, or you can even step it up to 16, you'd get similar runtimes, due to the extra power ( you'd keep your finger alot farther away from full :D )

[coolhandcountry]

Yes it does draw more power but you find that you are not as hard on the truck for it runs the speed you need and has the power you want with out drawing the amps. That is what I am saying. Cause if you can hammer on the 12 with out the flip. You going to go easy on the 14 cells for keep your walking down. ;) It is not so much scientific but just relation to driving style change. I get more run time out of 18 cells over the 14 but I don't run it wide open as much.

[Sylvester]

Good explenation.

makes sense