Originally Posted by
teeforb
here is something that seems contradicting. if the 4S system with these HOT motors is a good setup and people are able to run decent runtimes, what is the issue with them and why is everyone promoting 5S and 6S setups as apposed to the 4S setup?
No issue really. It's a matter of efficiency and reducing "wasted energy". Basic physics
Ohms law;
P(power)=U (voltage) x I (current)
Total wattage pulled by the motor = (Voltage) times (amp draw)
Without regard to other contributing factors, increasing the voltage will result in lower amperage draw for the same total output of power.
Lower amp draw (i.e less current flowing through the system) means there will be less power lost to heat from the resistance of the system. Starting with the IR of the battery, the resistance of the wiring from batt to ESC, the resistance of the ESC itself, and wiring running from ESC to motor. The higher the voltage, the less the internal resistance becomes a factor.