ORIGINAL: waross
So how do I figure out power drain of the motor...???
You don't figure it out. You measure it with a wattmeter. A wattmeter is an essential tool if you are serious about e-flight. Without a wattmeter, you are merely guessing about how your power system is performing.
That said, someone here may be familiar enough with your set-up to estimate the current consumption.
- Jeff