Motor KV in MBX-5?

[SilentMonster]

OK so forget the 40,000 rpm thing eh? So given the same speed via different gearing, what motor would be more efficient and run cooler: 1940/8, 1940/9 or 1950/7? Sorry for all the questions. I normally am one who has to figure out every thing in detail by myself but electrical systems have always been quite difficult for me to get a good full grasp on. I've got to admit, that's the main reason I got the Novak system for my G2R because I new it would at least work correctly(except for the snapped motor shaft "YEP") even though I new there was much better stuff. I've only been into this hobby for just over a year so for pete's sake give a guy a break will ya? Sorry bout that kinda got carried away HAHA. Thanks again, Stephen.