Will [link=http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXUR94]this esc[/link] work with the stock motor that comes with the Sig EP42?

I believe that it comes with an esc, but once the low voltage cutoff kicks in, you have to deadstick. I already own the above esc and it doesn't do that and I'd like to use it instead of the stock sig esc if possible.

Yes, you can use it. It's a little small for a 400 size brush motor but it will work. The difference between using a 10 and say a 30 is the 30 amp will allow more current to the motor sooner and the propeller will turn faster. I did a test on this one day with a 5 amp control and a 15 amp control and I was amazed with the extra power that the 15 put out.


Bevo

Bevo, unfortunately your description of the behaviour of ESCs is not entirely correct.

The ESC does not in any way limit the amount of current. If the motor/prop/battery combo will draw 20 Amps, and the ESC is only rated for 10 Amps, 20 Amps will still flow through the ESC. At least, until the ESC goes up in a puff of smoke

Some ESCs do have overcurrent protection built in, but those will shut the motor off as a general rule. I'm personally not familiar with one that backs off on the throttle when it's overloaded.

I'm not sure of the conditions of your test was performed under. Were you drawing more than 5 Amps?

By the way, a 10 Amp ESC is not enough for a Speed 400 motor. Use a 15 Amp ESC at least, preferably a 20 Amp.

I'm fairly certain some car and boat ESC's will limit current if you pull too much instead of just killing throttle control. Never heard of it on an airplane ESC though.