using quark 125 monstor, which motor?

[neweuser]

I run the same motor as Mike, the 1515 1/y on 4s and have also run it on 5s (got a tad warm on 5s though). I have several runs with constant running in a field barely taking my finger off the trigger. And, i have also done test runs doing hard starts and stops. This motor at the end of a full run stays so cool that I can keep my hand on for ever. Also, it's so efficient, my controller has yet to get over 100*F in 76* weather so far.

If you are running 4s, and want decent speed, yet bashable power, and dependability, the 1515 1/y is what you want. If you want more volts and speed, maybe the 1515 2.5D (which I think is much like a 1950/8 if I'm not mistaken).