Originally Posted by linger
Tim - I actually agree with you. A 7.4V lipo pack is just too fast to actually race with. I do not support that we start racing with this much voltage with a 1/12 scale. I did it for the "what if?" factor. The fact that everyone who tried it was grinning ear to ear was worth the effort.
My next experiment will be to try a 3.7V lipo in a 1/12 scale. I could rewire the 4.0 Ah 7.4V lipo that I have in there right now into a monster 8.0Ah 3.7V pack. It would be like running a 3 cell NIMH with super low IR. Hopefully the speed will be decent. I guess a receiver pack will be a must.
I don't think we should always equate voltage with speed/power. With our current 4 cell packs we could just use a touring 6 single, it would be too fast, likewise with a 7.4v lipo (8.4v charged) you could always use an 18x3 and it would be almost sensible!
The thing that kills most electric parts is high current, with lower voltage to have the same power you need even more current (power = volts x current). The reduced arcing at the comm with lower voltage in 12th does mean more motor life, but motors have always lasted longer in 12th than touring cars! I think tourers at low voltages will have enormous current which will heat wires, heat speedo's and generally make things inefficient. High currents also destroy Li-Po's.
To compare again to the flying part of the hobby, there has been a bit of a transition to higher voltages and lower capacities - there is still the same amount of energy in 4 cells wired in parallel (big capacity low voltage) as 4 cells in series (big voltage lower mah). However nothing gets as hot as the current is much lower, you just have to choose a suitable motor, ie not the same one, much like using a milder motor in a 12th if you have Li-Po's in it.
With brushless there is no arcing so the higher voltages cause no problems, the lower currents help keep speedo's cooler, look at the amount of tourers that shut down because the speedo gets too hot, both brushed and brushless come to think of it.
Li-Po's do still need to be handled with caution, shorting them or charging them incorrectly gets pretty messy!!! However treated well they are great.
I have used 2s3p packs in a 12th (4500mah total) with a 19t, it was absolutely awesome! current was a touch high though, 19's are designed to drag as much power as they can get, efficiency is secondary!!
However having said all that i do kinda like the 12th's just as they are at the moment! But the future is coming.....I just worry that people think lower voltage is the only way.....