The medusa will outperform the novak. As long as the 3700 lipos are 25c they should be ok. You will find that 50mph is a bit much, gear for 45mph and you will be happy. I do not see any issues with your setup, just make sure you have a few pinions and spurs to get the gearing just right.
ok perfect just for the record the gp3300 X 14 were a reference to my e-maxx i plan on useing the 5s1p zippy 5000mah packs
thanks again
you guys are very helpful
50mph is quite a top speed for any MT... if however that is your goal, the 36-60-2000v2 medusa will do it on 6s...
5s and 40ish mph would be my personal pick; however, it`s your call in this case of course...
i don`t believe that the 75mm novak has more [or even equal] torque to a good 4pole 60mm motor...