8ight-t gearing questions

[primus95]

hi guys,

Lookin at buying an RX8 1700Kv combo. I want to get into the 40+ mph range on 5S. Using the speed calc I would need to gear at least 15/47 - 16/47, is this too high for a 1700Kv motor on a Neu 5s1p 6500mah lipo? Would ideally like to us this as a basher/club racer.

thanks all :)