Motor Information needed!

[ekaser]

I think I understand how to determine RPMs. I multiply the Kv by the number of battery cells.

ex: (2) 2 cell lipos in series multiplied by the motor kv (using the stock Ms Geico motor) which is 1500Kv = 22,200 rpms.

This seems to be low on the rpms. Am I right?

How do I determine the amperage needed to run a motor? If my esc is 45-amp I know that this is the most amps my esc will supply the motor. How do I know if this is enough for a particular motor?

Thanks, Ed

[electric]

14.8 (Lipos) * 1500 = 22,200 rpms. The amperage is tricky. The "bigger" the prop the more amperage you will pull, and of course the motor itself. There are several devices you can get to measure the amp pull that will tell exactly what is going on.

Actually, the statement should be, the bigger the prop the more amps you will pull until one of a few things happens. The esc "melts down" to many amps. The battery "puffs" from to many amps, or the motor over heats(to much load/amps).

Amp meter will tell you what you need to know... The way I think of amps is that more amps equal more heat.

See the post a few threads down titled "how will this hold up" and there is some recomendations on amp/voltage measuring...