Originally Posted by hairless_ape
A HV servo doesn't perform any better at 8.4v than it does at 7.4v. The stated 7.4v numbers are it's peak.
Your argument is invalid.
physics says its not invalid.
Some servos can't handle more than 7.4V but those than can will perform better at higher voltages. Its a relatively simple relationship.
Feed a motor higher voltage it will either go faster or die. Simple as that. You can approximate it for the same motor (ideally) as apply double the voltage you'll double the no-load speed, double the torque, and quadruple the power.
Go do some testing of your own with a stop watch and a battery if you don't believe me. Report back the findings.
Originally Posted by Geezatec
I don't think its the ESC determines the voltage, more on the RX that distributes the voltage. And don't think its the voltage, 6v/7.4 are onlt the min/max voltage servo can draw. Better to look at amperage the servo takes. RX is more of your voltage regulator. My opinion.
If the ESC has a BEC then yes, it determine the voltage. The rx just passes it through along with the servo signal. It's not a voltage regulator.
On my 1/5th scale set up, I feed the receiver off the battery pack (to power it up) but pass out signal only. My servos are fed direct from the battery receiving the full 8.4V.
Not all receivers can handle the higher voltage though.