So after looking at @VladPomogaev’s data on watt usage, it seemed like the potential wattage of the motors we are using is much higher than it has to be. So I went looking and found a 5045 450kV Turnigy SK3, and it was rated at 1260 watts. From what I’ve seen 1260 should be enough, especially if you are running dual motors.
Using the esk8 calculator, I found that if you use a 6s li-ion pack, and a 40:12 gearing ratio, you would be able to hit a weighted top speed of 40km/h.
Since you’d be running 6s, you would have more space to run cells in parallel, helping solve issues with low discharge rates of li-ions. Also lower discharge li-ions have higher capacities.
Also, since BLDC motors have higher efficiency when they are at higher rpms, the large reduction ratio helps the system be more efficient.
As far as I can tell the only thing stopping something like this from working is the ESC. However I’ve heard the VESC v6 will be able to accommodate much higher kV motors as well as higher current.
So what gives? Why does high voltage/low kV seem to be the standard for high performance boards? It seems like we could be lowering the cost and weight of our boards with this kind of setup. Or am I missing something?