[lincpimp]

Not sure if this will help, but I tried a 10l feigao on both 3s and 4s, geared to produce the same top speed. I will say that the 4s sytem was superior to the 3s system, both in heat, power and runtime. On 3s the motr was turning about 27k and just did not feel that powerful, plus I was spinning a 20tooth pinion. On 4s it was spinning around 36k and I am using a 14 tooth pinion now. To be honest it feels like a completely different setup. It is generally said tyhat around 35k is a good speed to run thse motors and it seems to be true. If the neu motors will handle around 40k rpm I would suggest to run it at that speed. You will use lower gearing and most likey have a more effecient system. Just my opinion, and it is based on a feigao motor which is crap compared to the neu. But cheap, and they can be made to work properly. What we really need is a xxl feigao, maybe that will run cool! I just received some kb 45mm xl motors and they should be able to cope with heavier loads. Good luck with the decision.