Big high KV motor?

[nativepaul]

Hi folks, I am looking for a High KV motor that is larger than usual, ideally 6,000-7,000KV and around a pound of mass or more to run on 2s 20Ah LiPo.

[whitrzac]

That just sounds like a bad idea...

NEU still makes custom motors.

[nativepaul]

I know, it is a teribad idea, but still I want to do it. A Neu 1521 .5d would only be about 3200KV and I would like higher if anyone knows of any, maybe 2 poles would be more likely than 4 as they have more KV possibilities.

[_paralyzed_]

A 1521 can easily pull 3,500 watts. That's over 450 amps on 2s. Do you have a speed control in mind? I don't see this going well.

[Lizard]

Maybe contact TP Power, they make custom windings if you ask them.

But I also don't think this will work. Why would you want to do that? Where do you get a 2S high-amp ESC?

[RC-Monster Mike]

There are much less expensive ways to build a fire. :-)

[ruudxd]

I don't see a real problem, because I don't know where you gonna use it in?
1:10 scale onroads do the exact same thing, High Kv, low voltage, but then again, I am not very expierenced!

[RC-Monster Mike]

1/10 onroads use high Kv motors, but they are small....and they still have high current spikes. A Larger motor will see much larger spikes that many/most ESCs are ill-equipped to handle. Generally, increased power needs are met with increased voltage(1/8 use 4s and above to illustrate). As the current goes higher, it becomes harder to get the current to flow through the wires,connectors, solder joints, battery tabs, etc. so increasing voltage allows more power to flow at the lower current.

[Arct1k]

Volts = Current X Resistance
Power = Volts X Current

Loss = Current X Current X Resistance

Hence as current increases loses increase by square ie 3 x current = 9 x losses

Losses = Heat and failure.

[A RC Dude]

If you found an electrical engineer to help you, you could you use a big inductor in series with the motor to limit the current spikes (inductors resist change in current). but if your using it in an rc car i bet the inductor would defeat the purpose of using that motor.

[coolhandcountry]

What is the reasoning for only wanting 2s?