Re: Has anyone done one of the R/C motor spindles?

> The low end systems (such as the Novak Super
> Stock system :
> http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXGDP6&P=ML ) come

with

> a 175W motor, Kv 4300 rpm/v Kt 0.45 oz-in/amp. Maximum voltage is

about

> 8.5v, so around 36kRPM max. For another $40 you can step up to a
> faster, more powerful motor.

I get confused with all the numbers.

Kv = rpm per volt, assume 8.5 vols, so 4,300 RPM times 8.5 = 36,550
RPM max.

then Kt = oz-in per amp.
since it is a 175 wqtt motor, we can figure a 20 amp power supply.

Using 20 amp, then 20 times 0.45 = 8.1 oz-in for a motor.

( 36,550 x (8.1x.00521) ) / 5252 = 0.326 hp

Somehow I think the numbers may be wrong, but if that is correct, then
those motors have a LOT of power in a very small package.

It is a shame the cost is so dern high.

Dave