Motor voltage

[BrianG]

It is important to add that you will get less amps with more voltage IF the motor resistance is higher. And the 2Y does have higher resistance than the 1Y.

The whole amps question is moot really. So much depends on gearing, weight, drag, etc that is all but impossible to estimate. When selecting a motor, shoot for ~40k rpm for the better motors and ~35k for the Wanderers/Feigaos/etc. Then, just divide that max rpm by the motor kv to get the ideal voltage to run.