ORIGINAL: Slo-V Flyer
ORIGINAL: Slo-V Flyer
Given that the packs are almost similar in capacity ~5000 mah, theoretically you can get 50% more runtime with the 3s pack, by gearing down to keep the same top speed you would have with the 2s. This gear down again, would reduce the load on the motor and therefore things would run cooler and reduce current required to keep it going.
As for getting 2 2s packs, I'd say you get 1 2s and 1 3s lipo. You could wheelie with the 4600 on 2s, but you'll just be able to do it waaay more easily with the 3s.
Personally, I run 2s and 3s lipos in the Slash the the 2700 kv motor. I crash more horribly with the 3s and less with the 2s.
Other than more speed and insane power with 3s, I don't mind either battery.
This isn't exactly true, your motor's free speed increases linearly with voltage, but the stall current does as well. Power dissipated in the motor is based on the current squared, so it's hard to predict.
Depending on the gearing, it could run cooler, but it could be the other way as well.
I understand that, I was trying to provide some non-head exploding answer, but I think I can't put it into words.
Yes when going up in voltage, assuming you keep the same exact gearing, you also increase the amp draw proportionally. So 50% more voltage, going from 2s 7.4v to 3s 11.1v, will typically result in 50% more amp draw, again, given the same load on the motor (that being your gearing and everything else in the truck being the same, weight, tires, etc).
Usually more voltage does result in increased amp draw and then excessive amp draw results in more heat. That is why proper gear reduction is important in keeping the temps cool (relatively) when going up in voltage. Agreed.
Theoretically, going up double in voltage, from 2s to 4s lipo for example, net's about 4 times the power, not 2 times, as most people might think (including me for a long time). You're getting twice the RPM from twice the voltage feed, sure, but as stated above, you are also potentially increasing amp draw 2 times as much (again, assuming the motor can handle that amperage and convert it to usable torque), put simply you've increased the power output exponentially, not linearly.