KV / Gearing choices

[Procharged5.0]

Maybe what we need is info like you'll find on this attached pdf of a Mabuchi 550 motor. It tells alot about the motors "personality".

[BrianG]

Originally Posted by Procharged5.0

Maybe what we need is info like you'll find on this attached pdf of a Mabuchi 550 motor. It tells alot about the motors "personality".

That would be PERFECT! It shows the various values at max eff, and max power. So, the user can decide what they feel is most important and make the decision based on specific data.

To a large degree, battery quality plays a big role. It looks like the graph assumes an ideal voltage source (constant voltage and zero output impedance). Pretty much ANY battery will sag and react to certain loads.

And let's not mention how the ESC handles itself. Ideally, its output should be stable no matter what, but some loads (particularly high inductive loads) are more difficult to drive due to the voltage and current phase shifting.

Argg! It's enough to give one a headache! There are simply too many variables! The motor selection is hard enough without the user being forced to make assumptions on battery quality and ESC stability.